Answer:
C. Gamma/X-rays have no mass and no charge.
Explanation:
Gamma/X-rays are a type of electromagnetic radiation with no mass and no charge. They differ from other forms of radiation, such as alpha and beta particles, which have mass and charge. Gamma/X-rays are high-energy photons that have the highest frequency and shortest wavelength in the electromagnetic spectrum. They have very high ionizing power, which means they can remove electrons from atoms and molecules as they pass through matter, leading to potentially harmful effects on living organisms.
A student throws a 0.170 kg ball straight upwards to a height of 4.00 m how much work did the student do
The work done here on throwing the ball straight upwards to a height of 4 m is the change in its potential energy. Hence, here the change in potential energy is 6.66 J.
What is work done ?Work done is a physical quantity that measures the how much the force is effective in making a displacement. Hence it is the product of force and displacement.
The work done in bringing an object from one place to the other is called its potential energy. Here, the work done on throwing the ball straight upwards tp a height of 4 m is equal to its potential energy at this height.
Potential energy = mgh
g = 9.8 m/s²
m = 0.170 kg
h = 4 m
p = 9.8 m/s² × 4 m × 0.170 kg = 6.66 J.
Therefore, the work done in throwing the ball is 6.66 J.
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to determine the freezing point depression of a licl solution, toni dissolved 0.411 g of licl in 19.7 ml of distilled water. determine the molal concentration (m) of the resulting solution. mwlicl
The molal concentration of the resulting solution is 0.492 m. The concentration number of moles of solute in one kg of solvent.
It is the measure of the concentration number of moles of solute in one kg of solvent.
To calculate the molal concentration first calculated the mass of,
mass = density × volume
Put the values,
m = 1 g/mL 19.7 mL
m = 19.7 g or
m = 0.0197 kg
Calculate the moles of LiCl:
[tex]n = \frac{0.411 m }{42.395 g} * 1 mol[/tex]
n = 9.69 × [tex]10^{-3}[/tex] moles
So, now the molal concentration,
[tex]m = \frac{9.69 * 10^{-3} mol }{0.0197}[/tex]
m = 0.492
Therefore, the molal concentration of the resulting solution is 0.492 m.
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Ocean water contains about ___% salt.
a:7
b:5
c:3
When you are at the beach, you are playing in the sand of the _________________.
a: continental shelf
b: sea flor
Answer:
1. C.3
2. A. Continental shelf
Explanation:
Ocean water contains about 3% salt
When you are at the beach, you are playing in the sand of the Continental Shelf
A temperature change of +3°C is measured when a sample of calcium metal is burned in oxygen in a constant volume bomb calorimeter. Which statement correctly describes the changes in the stated thermodynamic functions for this reaction? A + + uB 0 00C - - -D - ++E + 0 +
The correct option is the option (b) .
What is temperature ?
Temperature is a unit used to represent how hot or cold something is. It can be stated using the Celsius or Fahrenheit scales, among others. Temperature shows which way heat energy will naturally flow, i.e., from a hotter (body with a higher temperature) to a colder (body with a lower temperature) (one at a lower temperature).
What is pressure ?
The definition of pressure is the amount of force that is exerted to a certain region. It can be calculated mathematically as P=FA, where F is the force applied perpendicular to surface area A. The pascal (Pa), or one newton per square metre (N/m 2), is the accepted unit of pressure..
In a constant volume bomb calorimeter change in temperature is ∆T= 30C and as the volume is constant so change in volume ∆V= 0.
So we have work done= P×∆V= P×0= 0
Where P is the pressure.
Again burning calcium metal with oxygen is an exothermic reaction and heat is released.
So "q= -". And we have according to first law of thermodynamics ," energy can neither be created nor be destroyed" So q= ∆E+ W and W=0
So "q=∆E= -".
Hence, q= - , W=0, ∆E= -
So correct option is option-B
Therefore, The correct option is the option (b) .
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The water in a garden hose flows at a rate of 10.0 liters per minute. What is the flow rate in gallons per hour? (1gal=3.79L)
The water in a garden hose flows at a rate of 10.0 liters per minute. Therefore, 158 gal/hr is the flow rate in gallons per hour.
What is flow rate?Flow rate is the amount of liquid that travels in a given length of time. Furthermore, the flow rate is affected by the channel through which the liquid is travelling, the area of the pipe, as well as the velocity of something like the liquid. Furthermore, the formula is. Fluid dynamic rate = pipe or channel area x liquid velocity.
The volume flow value is the rate of liquid (water flow rate formula) passing through every place in an area over time.
1 gal = 3.79 L
60 min = 1 hr
10.0 L/min x 60 min/hr x 1 gal/3.79 L = 158 gal/hr
Therefore, 158 gal/hr is the flow rate in gallons per hour.
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Your friend says to you, “The energy your brain uses to think comes from the sun.” How do you trace energy from the sun to the energy used for your brain cells to work? Write your answer below in complete sentences. PLEASE HELP ME QUICK IM GUNNA FAIL!!!!!!!!!!
The energy from the sun can be traced to the energy used by the brain from the food we consume.
Source of brain's energyThe brain gets its energy from the food we consume while most of the food we consume come from plants or animals that consume plants.
Plants get their own food directly from sunlight through the process of photosynthesis. They are able to convert solar energy from the sun to chemical energy.
When humans consume food, the energy in the food is unlocked and converted to usable energy by the body. This is part of the energy that the brain makes use of.
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The diagram below shows a wave with a distance of 6 meters between points A and B. What is the wavelength of this wave?
Answer:
The wavelength of the wave in the diagram is 6 meters. This can be calculated by measuring the distance between points A and B and dividing it by the number of waves. In this case, there is one wave, so the wavelength is equal to the distance between points A and B, which is 6 meters.
A certain liquid sample contains a small amount of dissolved chloroform. Which of the following would be the most effective way to rid the liquid of chloroform? Select the correct answer below: A. Leaving the sample open to the atmosphere in the laboratory B. Chilling the sample in a freezer, and providing an outlet for the gas to flow into a storage container C. Heating the sample gently, and providing an outlet for the gas to flow into a storage container D. Capping the container tightly and shaking it
A certain liquid sample contains a small amount of dissolved chloroform. The most effective way to rid the liquid of chloroform is Heating the sample gently, and providing an outlet for the gas to flow into a storage container. The correct answer is C.
Some of the liquid sample has some dissolved chloroform in it. The best method for removing chloroform from the liquid is to gently heat the sample while creating a passageway for the gas to escape into a storage container.
Allowing the gas to escape and flow into a storage container while gently heating the sample As long as a secure outlet and a container for the gas are offered, heating the sample will enable the chloroform to escape, which is an efficient method of degassing the liquid.
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Iron ore, which is composed of mostly Fe2O3, is converted to cast iron (Fe) in a blast furnace.
The reaction is given below:
Fe2O3 + 3CO
⟶
2Fe + 3CO2
If 159.2 kg of Fe is obtained from 267.5 kg of ore and the percent yield of the reaction is 95.0% , what is the percent of Fe2O3 in the iron ore? Assume that there is enough CO to react with all the Fe2O3.
Molar mass of Fe2O3 = 159.69 g/mol
Molar mass of Fe = 55.85 g/mol
Elements that have atoms with full outer shells of electrons___
A) will form many compounds.
B) will normally form anions.
C) will normally form cations.
D) frequently form hydrogen bonds.
E) are inert gases
E) are inert gases. Inert gases have full outer shells of electrons, making them unreactive and unlikely to form compounds.
Elements that have full outer shells of electrons, also known as noble gases, are highly unreactive and unlikely to form compounds. This is because their electrons are fully occupied in the outermost energy level, so they have no desire to bond with other elements. As a result, they are referred to as "inert gases". Examples of inert gases include helium, neon, argon, krypton, xenon, and radon. Inert gases are often used in a variety of applications due to their stability and lack of reactivity, such as filling the space inside light bulbs, in cooling and refrigeration systems, and as shielding gases in welding.
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Superficial fascia refers to the fatty hypodermis below the skin, whereas deep fascia are the sheets of tissue that wrap around muscles, large blood vessels, etc. a. true b. false
The given statement is true. Superficial fascia refers to the fatty hypodermis below the skin.
The lamina propria of mucous membranes is created by areolar connective tissue. In contrast to the deep fascia, which are the sheets of tissue that wrap around muscles, big blood arteries, etc., the superficial fascia is the fatty hypodermis beneath the skin. The hypodermis contains a sizable portion of the body's fat tissue.
Directly beneath the epidermis and the topmost adipose layers is the superficial fascia. It can exhibit stratification both macroscopically and grossly. It is typically defined as consisting of loosely packed interwoven collagen and elastic fibers in membranous layers.
Bones, muscles, nerves, and blood arteries are encircled by deep fascia. Compared to the other kinds, it frequently has a more fibrous nature and is rich in hyaluronan.
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When a solution forms from some compound, the temperature of the solution quickly drops. Which of the following statements is true? Select all that apply: a. The dissolution process is endothermic. b.The dissolution process is exothermic. c.The entropy of solution is likely highly positive. d.The entropy of solution is likely highly negative.
a. The dissolution process is endothermic.The entropy of solution is likely highly positive.the temperature of the solution quickly drops.
What is endothermic ?Endothermic is a type of chemical process in which energy is absorbed from the surroundings in order to cause a reaction. A common example of an endothermic reaction is the dissolution of anhydrous ammonia in water. When this happens, the reaction absorbs energy from the surrounding environment in the form of heat. This is because the ammonia molecules need to break apart in order to dissolve in the water. It is also possible for reactions to be endothermic without the need to absorb heat; in this case, the reaction absorbs energy from the environment in the form of light or electricity. Endothermic reactions can be used to create energy efficient products such as insulation, air conditioners, and refrigerators. In addition, endothermic reactions are used in many industrial processes.
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In radioactivity, half-life refers to the interval of time required for one-half of the atomic nuclei of a radioactive sample to decay. If the half-life is 1 000 years, which of the following alternatives is the best approximation of the time, when 7/8 of nuclei have decayed and 1/8 are remaining?In radioactivity, half-life refers to the interval of time required for one-half of the atomic nuclei of a
radioactive sample to decay. If the half-life is 1 000 years, which of the following alternatives is the
best approximation of the time, when 7/8 of nuclei have decayed and 1/8 are remaining?
In radioactivity, half-life refers to the interval of time required for one-half of the atomic nuclei of a
radioactive sample to decay. If the half-life is 1 000 years, which of the following alternatives is the
best approximation of the time, when 7/8 of nuclei have decayed and 1/8 are remaining?
The best option would be that If the half-life is 1 000 years, then the time when 7/8 of nuclei have decayed and 1/8 are remaining is approximately 2,000 years.
What is radioactivity?Radioactivity is the phenomenon in which an atomic nucleus undergoes spontaneous decay, emitting particles and radiation in the process. This results in the emission of alpha particles (helium nuclei), beta particles (electrons), and gamma rays (high-energy photons), which can be harmful to living things.
The decay process is caused by an unstable ratio of protons to neutrons in the nucleus, leading to the emission of particles and radiation until a more stable configuration is reached.
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Fill in the blanksome of the most dangerous conditions occur when temperatures are hovering around ___ degrees fahrenheit, or freezing, when snow begins to turn to watery slush.
Some of the most dangerous conditions occur when temperatures are hovering around 32 °F degrees Fahrenheit, or freezing when snow begins to turn to watery slush.
The three most common forms of exceptionally severe weather are heat waves, cold waves, and tropical cyclones. The increased economic expenses, the loss of human lives, droughts, floods, landslides, and changes in ecosystems are all repercussions that may be seen as a direct result of extreme weather events.
There is evidence to show that climate change is increasing the frequency of some extreme weather events as well as the intensity of those occurrences.
Changes in the frequency or magnitude of extreme heat and cold events are the ones in which the confidence in attributing extreme weather and other events to anthropogenic climate change is highest. There is also some confidence in the attribution of increases in heavy precipitation and increases in the intensity of droughts.
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Which of these industries provides jobs and boosts the economy through product sales and advertising? (2 points)
Group of answer choices
Communications
Electronics
Tourism
Oil and g
Answer:
All of the industries listed can provide jobs and boost the economy through product sales and advertising. However, "Communications" and "Electronics" are particularly noted for their significant impact in providing jobs and boosting the economy through product sales and advertising. The communications industry includes the telecommunications and media sectors, which generate revenue through product sales and advertising. The electronics industry is a major contributor to the global economy, with products such as smartphones, laptops, and other electronics driving product sales and generating revenue through advertising.
"Tourism" is another industry that can contribute to job creation and economic growth through product sales and advertising, as it involves the sale of travel-related products and services and can generate significant revenue through advertising.
"Oil and Gas" is also an important industry that can provide jobs and boost the economy through product sales and revenue generated from the production and sale of oil and gas products.
compare and contrast the cause of a flow of water in a pipe and the cause of a flow of electrons in a wire
The flow of water in a pipe and the flow of electrons in a wire are both examples of fluid flow and are caused by different physical phenomena.
The flow of water in a pipe is caused by a pressure difference, also known as a pressure gradient, between two points. If the pressure at one end of the pipe is higher than the pressure at the other end, water will flow from the high-pressure end to the low-pressure end. The flow rate will depend on the pressure difference, the diameter of the pipe, and the viscosity of the fluid.
The flow of electrons in a wire, on the other hand, is caused by a difference in electrical potential, also known as a voltage difference, between two points. If the voltage at one end of the wire is higher than the voltage at the other end, electrons will flow from the high-voltage end to the low-voltage end. The flow rate will depend on the voltage difference, the resistance of the wire, and the number of electrons available to flow.
In summary, the cause of the flow of water in a pipe is a pressure difference, while the cause of the flow of electrons in a wire is a voltage difference.
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what is the priocess where the number of protons in a nuclide is decreased whiule the mawss number rem,ains constant
Electron capture is the process where the number of protons in a nuclide is decreased while the mass number remains constant.
What is the process of electron capture?
During electron capture, an electron in an atom's inner shell is drawn into the nucleus where it combines with a proton, forming a neutron and a neutrino. The neutrino is ejected from the atom's nucleus. Since an atom loses a proton during electron capture, it changes from one element to another.
What happens to the mass number during electron capture?
Following electron capture, the atomic number is reduced by one, the neutron number is increased by one, and there is no change in mass number.
Why does electron capture decrease atomic number?
When a nucleus captures an electron, a proton changes into a neutron, and an electron-type neutrino is emitted. The atomic number goes down by one unit, accounting for the loss of a proton, and the total number of protons plus neutrons stays unchanged, accounting for the gain of a neutron.
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provide the product(s) for the following diels-alder reaction. assume that the conditions are irreversible, and be sure to indicate the stereochemistry of the product where applicable.
The Diels-Alder reaction gives a product containing a conjugated diene and a dienophile.
Stereochemistry depends on the arrangement of the substituents on the starting materials - if the dienophile has a cis configuration relative to the diene, the reaction will give a cis product, and if they are in a trans configuration, then the reaction will give a trans product. In an irreversible reaction, the product is a single dienophile, and can be determined by examining the relative configurations of the starting materials. two single-bonded oxygen atoms, with the newly-formed double-bonded oxygen now attached to a hydrogen atom. This new structure is the carboxyl group, which can be seen in the products of the hydrolysis reaction illustrated above.
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4Fe(s)+3O2(g)⇄2Fe2O3(s)ΔH=−1,650kJ/molrxn The oxidation of Fe(s) is represented by the chemical equation above. Which of the following correctly explains whether or not the reaction is thermodynamically favorable?
There are more particles (including particles in the gas state) in the reactants than in the product, thus ΔSrxn<0. Because ΔH is large and negative, the reaction will be thermodynamically favorable at low temperatures explain whether or not reaction is thermodynamically favorable. THe correct answer is A.
The reactants include more particles (including particles in the gaseous state) than the product, therefore ΔSrxn<0. The reaction will be thermodynamically advantageous at low temperatures since H is big and negative.
ΔS<0. Because ΔG=ΔH−TΔS<0 is the need for a process to be thermodynamically advantageous, ΔG must be negative for -TS to be substantially lower than ΔH in size. At low temperatures, this will be accurate.
Your question is incomplete but most probably your full question was
4Fe(s) + 3O2(g) ⇋ 2Fe2 O3(s) ΔH = −1,650 kJ/molrxn
The oxidation of Fe(s) is represented by the chemical equation above. Which of the following correctly explains whether or not the reaction is thermodynamically favorable?
A There are more particles (including particles in the gas state) in the reactants than in the product, thus ΔSrxn < 0 . Because ΔH is large and negative, the reaction will be thermodynamically favorable at low temperatures.
B There are more particles (including particles in the gas state) in the reactants than in the product, thus ΔSrxn < 0. Because ΔH is large and negative, the reaction will not be thermodynamically favorable at any temperature.
C There are more particles (including particles in the gas state) in the reactants than in the product, thus ΔSrxn > 0. Because ΔH is large and negative, the reaction will be thermodynamically favorable at all temperatures.
D There are more particles (including particles in the gas state) in the reactants than in the product, thus ΔSrxn > 0. Because ΔH is large and negative, the reaction will not be thermodynamically favorable at any temperature
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The water circuit in shell and coil and coil-type tube-in-a-tube condensers must be cleaned ____. a. by removing the end caps
b. with a brush
c. chemically
d. by air pressure
The water circuit in shell and coil and coil-type tube-in-a-tube condensers must be cleaned chemically.
Brass, titanium, stainless steel, ferritic stainless steel, copper-nickel alloys, and these metals are used as tube materials most frequently in condensers.
By adjusting the flow of refrigerant via the condenser, a water regulating valve aids in maintaining the system's head pressure.
Condensers with coils and shells. A coil of finned water tubing is housed inside a welded shell in a shell-and-coil condenser. The hot refrigerant circulates in the shell of this type of water-cooled condenser while the cooling water cools the coils and condenses the refrigerant. In general, it is inexpensive and most portable.
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Hydrogen peroxide with manganese (iv) oxide
Molecular equation, total ionic equation, and net ionic equation
The balanced equation is; 2MnO2 + 3H2O2 + 2OH − →2MnO4− +4H2O
What is the balanced chemical equation?A balanced chemical equation is a chemical equation in which the number of atoms of each element is equal on both sides of the equation. This means that the same number of atoms of each element are involved in the reactants (the starting materials) and the products (the substances formed).
Balancing a chemical equation ensures that the law of conservation of mass is obeyed, as the total mass of the reactants must equal the total mass of the products.
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oxygen (o) reacts with lithium (li) to form li2o. when selenium (se) reacts with sodium (na), which of the following products forms?
Depending on the reaction conditions, the reaction between selenium (Se) and sodium (Na) can result in a variety of compounds. However, sodium selenide is a frequently formed product (Na2Se).
Under the right circumstances, sodium (Na) and selenium (Se) can react to generate a variety of products, including sodium selenide (Na2Se) and/or other intermediary compounds. The creation of ionic compounds with various stoichiometries is often the outcome of an electron transfer process between the reactants. Temperature, pressure, concentration, and the presence of catalysts are a few examples of the variables that may have an impact on the reaction rate and product distribution. With a high melting point and black hue, sodium selenide is a solid that is frequently utilised in the production of other selenium compounds. Overall, the reaction of selenium with sodium is a significant procedure for producing compounds containing selenium that have a variety of uses in chemistry, materials science, and industry.
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The ability of water to dissolve a large number of different substances relates to which of it's following characteristics?
1. water has a high heat capacity
2. water has a high heat of vaporization
3. water is a solvent
4. water is cohesive
Answer:
water os solvent answer option 3
Which of the gases in air are elements explain how you can tell
Answer: Nitrogen, Oxygen, Argon, Helium and Neon are elements.
Explanation:
The main components of air are:
Nitrogen (78%)
Oxygen (21%)
Carbon dioxide (0. 04%)
Argon (0. 93%)
Trace amounts of helium, neon, methane, hydrogen and water vapour.
Out of all these components here, Nitrogen, Oxygen, Argon, Helium and Neon are elements. We can tell that because element is a chemical substance that cannot be broken down into other substances, and here we can see that unlike methane(CH₄), Carbor dioxide (CO₂) or water vapor(H₂O) , these elements cannot be broken down into anything simpler.
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An alkyne can be prepared by the reaction of a(n) ______ with a strong base such as NaNH2. Select all that appl
An alkyne can be prepared by the reaction of a vicinal dihalide or geminal dihalide with a strong base such as NaNH2.
This reaction is known as the "halogen exchange reaction" or "halogenation reaction". During this reaction, the halide ions of the dihalide are replaced by the base, resulting in the formation of an alkyne. The reaction typically takes place at room temperature, and can be catalyzed with a Lewis acid such as boron trifluoride (BF3).
The halogen exchange reaction is a useful method for the preparation of alkynes and is widely used in the synthesis of organic compounds.
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Is this correct or does this need a decimal?
For conversion degree Celsius into kelvin we have to add the value 273 in given value.The temperature in kelvin of 73°C is 346 K.
What is meant by temperature conversion?A temperature converter helps change over the temperature between Fahrenheit and Celsius scale. Temperature is measured using a thermometer.
While Kelvin (K) is the SI unit of temperature, people generally use Centigrade or Celsius (°C) and Fahrenheit (°F) to measure temperature.
For conversion degree Celsius into kelvin we have to add the value 273 in given value.
We have to convert 73°C into kelvin.
Therefore,
= 73 + 273
= 346 Kelvin
Thus, The temperature in kelvin of 73°C is 346 K.
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green plants take in water (h2o) and carbon dioxide (co2) and produce glucose (c6h12o6) and oxygen gas (o2). calculate the molar masses of carbon dioxide, glucose, and oxygen gas. part 1
co2 g/mol part 2 c6h12o6 g/mol part 3
o2 g/mol
Molar mass of H2O = 18 g/mole
Molar mass of O2 = 32 g/mole
Molar mass of glucose = 180 g/mole
What is molar mass?
The molar mass is the substance; it helps to determine the mass of the sample substance to the atom of the sample or substance. The molar mass depends on the molecular formula and the isotopes of the atom. Molar mass is used for the inducement of electric charge. Molar mass is the measurement of the volume of the mass. The molar mass is expressed in the unit of dalton.
What is mole?A mole is the atom's elementary particle, an ion. The mole of the substance is always related to the Avogadro number. The mole is always associated with the weight or mass of the element or substance. The standard unit of a mole is mol. The mole is a significant factor of the reactant and products to form an equation. A mole calculates the atom, ion, and substance weighs.
6CO2 + 6H2O ----> C6H12O6 + 6O2
Atomic mass C = 12 g/mole
atomic mass of O = 16 g/mole
atomic mass of H = 1 g/mole
Thus, molar mass of CO2 = 44 g/mole
Molar mass of H2O = 18 g/mole
Molar mass of O2 = 32 g/mole
Molar mass of glucose = 180 g/mole
Thus, moles of glucose in 0.075 g of it = mass/molar mass = 0.075/180 = 0.00042
number of molecules of aspirin = moles*Avagadro's Number = 0.00042*6.022*1023 = 2.509*1020
239Pu + 4He2+ ------> 240Cm + 3n10
Therefore, Green plants take in water (h2o) and carbon dioxide (co2) and produce glucose (c6h12o6) and oxygen gas (o2), the moles are listed above.
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Limiting reagent questions. Please show your work for these 5 questions.
1. Potassium superoxide, KO2, is used in rebreathing masks to generate oxygen according to the reaction below. If the mask contains 0.150 mol KO2 and 0.100 mol water, how many moles of oxygen can be produced? What is the limiting reagent?
4KO2(s) + 2H2O(l) → 4KOH(s) + 3O2(g)
2. Suppose 13.7 g of C2H2 reacts with 18.5 g O2 according to the reaction below. What is the mass of CO2 produced? What is the limiting reagent?
2C2H2(g) + 5O2(g) → 4CO2(g) + 2H2O(l)
3. Nitrogen gas can react with hydrogen gas to form gaseous ammonia. If 4.7 g of nitrogen
reacts with 9.8 g of hydrogen, how much ammonia is formed? What is the limiting reagent?
4. One of the most common acids found in acid rain is sulfuric acid. Sulfuric acid is formed when gaseous sulfur dioxide reacts with ozone (O3) in the atmosphere to form gaseous sulfur trioxide and oxygen. The sulfur trioxide forms sulfuric acid when it comes in contact with water. If 5.13 g of sulfur dioxide reacts with 6.18 g of ozone, how much sulfur trioxide is formed? What is the limiting reagent?
5. Another way that sulfuric acid is formed in the atmosphere is when sulfur dioxide reacts with oxygen in a reaction catalyzed by dust in the atmosphere to form sulfur trioxide. If 7.99 g of sulfur dioxide reacts with 2.18 g of oxygen, how much sulfur trioxide can form? What is the limiting reagent?
The limiting reagents are potassium superoxide, carbon dioxide, nitrogen , Sulphur dioxide and oxygen respectively
What are the limiting reagent1.
Potassium superoxide reaction:
4KO2(s) + 2H2O(l) → 4KOH(s) + 3O2(g)
Given: 0.150 mol KO2 and 0.100 mol water
We can start by calculating the amount of moles of oxygen that can be produced from each reactant.
From 0.150 mol of KO2, we can produce:
0.150 mol KO2 * (3 moles O2 / 4 moles KO2) = 0.113 mol O2
From 0.100 mol of water, we can produce:
0.100 mol H2O * (3 moles O2 / 2 moles H2O) = 0.150 mol O2
Since the amount of moles of oxygen that can be produced from the water is larger, we have a surplus of water. Therefore, potassium superoxide is the limiting reagent, and we can produce 0.113 moles of O2.
2.
C2H2 and O2 reaction:
2C2H2(g) + 5O2(g) → 4CO2(g) + 2H2O(l)
Given: 13.7 g of C2H2 and 18.5 g of O2
We can start by calculating the amount of moles of each reactant:
C2H2: 13.7 g / 26.04 g/mol = 0.522 mol
O2: 18.5 g / 32.00 g/mol = 0.580 mol
We can then calculate the amount of moles of CO2 produced from each reactant:
From 0.522 mol of C2H2, we can produce:
0.522 mol C2H2 * (2 moles CO2 / 2 moles C2H2) = 0.522 mol CO2
From 0.580 mol of O2, we can produce:
0.580 mol O2 * (2 moles CO2 / 5 moles O2) = 0.232 mol CO2
Since the amount of moles of CO2 that can be produced from O2 is smaller, we have a surplus of O2. Therefore, C2H2 is the limiting reagent, and we can produce 0.522 moles of CO2. To find the mass, we can multiply the amount of moles by the molar mass of CO2:
0.522 mol * (44.01 g/mol) = 23.0 g CO2
3.
Nitrogen gas can react with hydrogen gas to form gaseous ammonia. If 4.7 g of nitrogen reacts with 9.8 g of hydrogen, how much ammonia is formed? What is the limiting reagent?
We can balance the reaction equation first:
N2(g) + 3H2(g) → 2NH3(g)
Next, we need to convert the masses of nitrogen and hydrogen to moles.
For nitrogen:
moles = mass / molar mass
moles = 4.7 g / 28.0 g/mol = 0.168 mol
For hydrogen:
moles = mass / molar mass
moles = 9.8 g / 2.0 g/mol = 4.9 mol
Since the reaction requires 3 moles of hydrogen for every 1 mole of nitrogen, the limiting reagent will be nitrogen.
The amount of ammonia that can be formed can be calculated using the moles of the limiting reagent.
moles of NH3 = moles of N2 * 2
moles of NH3 = 0.168 mol * 2 = 0.336 mol
Mass of NH3 = moles of NH3 * molar mass of NH3
Mass of NH3 = 0.336 mol * 17.0 g/mol = 5.7 g
So, 5.7 g of ammonia can be formed and nitrogen is the limiting reagent.
4.
One of the most common acids found in acid rain is sulfuric acid. Sulfuric acid is formed when gaseous sulfur dioxide reacts with ozone (O3) in the atmosphere to form gaseous sulfur trioxide and oxygen. The sulfur trioxide forms sulfuric acid when it comes in contact with water. If 5.13 g of sulfur dioxide reacts with 6.18 g of ozone, how much sulfur trioxide is formed? What is the limiting reagent?
We can balance the reaction equation first:
2SO2(g) + O3(g) → 2SO3(g)
Next, we need to convert the masses of sulfur dioxide and ozone to moles.
For sulfur dioxide:
moles = mass / molar mass
moles = 5.13 g / 64.0 g/mol = 0.0801 mol
For ozone:
moles = mass / molar mass
moles = 6.18 g / 48.0 g/mol = 0.1288 mol
Since the reaction requires equal moles of sulfur dioxide and ozone, the limiting reagent will be whichever has the smaller amount, in this case, sulfur dioxide.
The amount of sulfur trioxide that can be formed can be calculated using the moles of the limiting reagent.
moles of SO3 = moles of SO2 * 2
moles of SO3 = 0.0801 mol * 2 = 0.1602 mol
Mass of SO3 = moles of SO3 * molar mass of SO3
Mass of SO3 = 0.1602 mol * 80.0 g/mol = 12.8 g
So, 12.8 g of sulfur trioxide can be formed and sulfur dioxide is the limiting reagent.
5.
Sulfur trioxide is formed when sulfur dioxide reacts with oxygen:
SO2 + 1/2 O2 → SO3
From the given amounts of sulfur dioxide and oxygen, we can calculate the amount of sulfur trioxide that can form:
7.99 g SO2 * (1 mol SO2 / 64.06 g SO2) = 0.1251 mol SO2
2.18 g O2 * (1 mol O2 / 32.00 g O2) = 0.0681 mol O2
We need equal amounts of sulfur dioxide and oxygen for complete reaction, so the limiting reagent is the one with the smaller amount, which is oxygen. The maximum amount of sulfur trioxide that can form is determined by the amount of oxygen:
0.0681 mol O2 * (1 mol SO3 / 0.5 mol O2) = 0.1362 mol SO3
0.1362 mol SO3 * (80.06 g SO3 / 1 mol SO3) = 10.93 g SO3
So, 10.93 g of sulfur trioxide can form from the given amounts of sulfur dioxide and oxygen. The limiting reagent is oxygen.
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Write the empirical formula of at least four binary ionic compounds that could be formed from the following ions:
Zn2+, Au3+, Cl−, S2−
Answer:
Explanation:
To determine the empirical formula of binary ionic compounds, we need to balance the charges of the cations and anions.
Zn2+ and Cl-: Since Zn2+ has a charge of 2+ and Cl- has a charge of 1-, we need two Cl- ions to balance the charge. Therefore, the empirical formula is ZnCl2.
Zn2+ and S2-: Since Zn2+ has a charge of 2+ and S2- has a charge of 2-, we only need one of each ion to balance the charge. Therefore, the empirical formula is ZnS.
Au3+ and Cl-: Since Au3+ has a charge of 3+ and Cl- has a charge of 1-, we need three Cl- ions to balance the charge. Therefore, the empirical formula is AuCl3.
Au3+ and S2-: Since Au3+ has a charge of 3+ and S2- has a charge of 2-, we need two S2- ions to balance the charge. Therefore, the empirical formula is Au2S3.
The empirical formulas of the binary ionic compounds formed from Zn2+, Au3+, Cl-, and S2- are ZnCl2, ZnS, AuCl3, and Au2S3.
An ethylene glycol solution contains 28.2 gg of ethylene glycol (C2H6O2)(C2H6O2) in 92.8 mLmL of water. (Assume a density of 1.00 g/mLg/mL for water.)
Determine the freezing point of the solution.
Determine the boiling point of the solution.
The freezing point of the solution is: 9.19 °C and the boiling point of the solution is: 102.54 °C.
To determine the freezing point of the solution, we can use the equation Δ[tex]T_{f}[/tex] = Kf x molality
The mass of the solvent in the solution is given as 92.8 mL, so we convert it to grams:
mass of solvent = 92.8 mL x 1.00 g/mL = 92.8 g
mass of solvent = 92.8 g / 1000 g/kg = 0.0928 kg
The moles of solute (ethylene glycol) can be calculated using its molar mass:
moles of solute = 28.2 g / (62.07 g/mol) = 0.4556 mol
molality = 0.4556 mol / 0.0928 kg = 4.92 m
And the change in freezing point is:
Δ[tex]T_{f}[/tex] = Kf x molality = 1.86 °C/m x 4.92 m = 9.19 °C
Freezing point of the solution is:
[tex]T_{f}[/tex]= [tex]T_{f}[/tex]- Δ[tex]T_{f}[/tex] = 0 °C - 9.19 °C = -9.19 °C
To determine the boiling point of the solution, we can use the equation ΔTb = Kb x molality
ΔTb =0.52 °C/m x 4.92 m = 2.54 °C
Boiling point of the solution is:
Tb = Tb + ΔTb = 100 °C + 2.54 °C = 102.54 °C
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