Answer:
Explanation:
The kinetic energy of molecules is related to their temperature, and at a given temperature, all molecules, polar or non-polar, have the same average kinetic energy. The difference between polar and non-polar molecules lies in their intermolecular forces. Polar molecules have dipoles (separation of charge) due to differences in electronegativity of the atoms within the molecule. These dipoles cause the polar molecules to have stronger intermolecular forces, such as dipole-dipole forces and hydrogen bonding, compared to non-polar molecules which only have weak van der Waals forces.
At 100 K, the kinetic energy of both polar and non-polar molecules is low. However, polar molecules are more likely to be attracted to each other due to their stronger intermolecular forces. This means that polar molecules may have lower kinetic energy compared to non-polar molecules at the same temperature, because they may be more likely to be held together by these forces.
In terms of which group of molecules has greater intermolecular forces, it would be the polar molecules due to the presence of dipoles and the resulting stronger intermolecular forces. However, it's important to note that intermolecular forces can vary greatly within each group of molecules, depending on the specific molecule and its structure.
What is the mass of :
a) 6 X 10²³ atoms of He
b) 6 X 10²³ atoms of Na
c) 6 X 10²³ molecules of nitrogen
d) 6 X 10²⁴ atoms of Cl
e) 1.2 X 10²⁴ atoms of B
f) 1.8 X 10²⁴ atoms of Mg
How many atoms are there in:
a) 7 g of Li
b) 28 g of Si
c) 62 g of S
d) 12 g of Mg
e) 10 g of Ca
f) 200 g of Ne
Helium is the sole element that cannot be solidified by adequate cooling at atmospheric pressure. Therefore, 4g is the mass of helium.
What is helium?Helium (He) is a chemical element and inert gas in Periodic Group 18 (noble gases). Helium, the second lightest chemical (only hydrogen is lighter), is a colorless, odorless, and colorless gas that solidifies at 268.9 °C (452 °F). Helium has lower boiling as well as freezing points than any other known material.
Helium is the sole element that cannot be solidified by adequate cooling at atmospheric pressure; it must be consolidated at a stress of 25 atmospheres at a temperature of one K (272 °C or 458 °F).
mole = given number of atoms/ 6.022×10²³
= 6 X 10²³ /6.022×10²³
= 1 mole
mass = mole× molar mass
= 1×4
= 4g
Therefore, 4g is the mass of helium.
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Choose the list of items that starts with the least dense and ends with the most dense:
A: water, alcohol, ping pong ball
B: milk, maple syrup, honey
C: bolt, cherry tomato, soda cap
D: corn syrup, dish soap, lamp oil
Answer: The answer is B
Explanation: i took the test
vitamin c has the formula cxhyoz. you burn 0.281 g of the compound in a combustion analysis chamber and isolate 0.421 g of co2 and 0.114 g of h2o. what is the empirical formula? enter the elements in the order c, h, and o.
The simplest whole-number ratio of the various atoms in a compound is represented by an empirical formula.
What is the simple empirical formula?empirical method a chemical formula, rather than listing the total number of atoms in a molecule, shows the most basic ratio of the components in a compound.
The precise number of various atom types present in a compound's molecule is indicated by the molecular formula. The empirical formula for acetylene is CH. The empirical formula for acetylene is C2H2.
Sample mass equals 0.7789 CO2 mass generated = 1.179
Produced mass of to = 0.3179
C mass in the sample equals [tex]12 x 1.17 44, or 0.3199.[/tex]
Its mass in the sample is equal to [tex]2 x 0.317 18 = 0.0359[/tex]
The sample's mass of is given by [tex]0.778-(0.319+0.035) = 0.424 0.319[/tex].
Divide by 12 H 0.035 0.424 mass their molar and [tex]0.319 0.035 \s0.424 16 \s0.027 \s0.035 \s0.027[/tex]
by the smallest number
[tex]0.027 \s0.027 \s0.035 \s0.027 \s0.027 0.027 \s1.3[/tex]
To express the number 3 4 3 in whole numbers, multiply by 3.
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Magnesium and nitrogen react in a combination reaction to produce magnesium nitride:
3 Mg + N2→ Mg3N2
In a particular experiment, a 10.1-g sample of N2 reacts completely. The mass of Mg consumed is ________ g.
Magnesium and nitrogen react in a combination reaction to produce magnesium nitride:
3 Mg + N2→ Mg3N2
In a particular experiment, a 10.1-g sample of N2 reacts completely. The mass of Mg consumed is ________ g.
0.92
26.3
8.76
13.9
35.1
The term mole concept is used here to determine the mass of magnesium. The mass of magnesium is 26.3 g. Thus the correct option is B .
What is a mole?One mole of a substance is defined as that quantity of it which contains as many entities as there are atoms exactly in 12 g of carbon - 12. The formula used to calculate the number of moles is:
Number of moles = Given mass / Molar mass
The balanced equation when Magnesium and nitrogen react in a combination reaction to produce magnesium nitride is:
3 Mg + N₂→ Mg₃N₂
The mass of magnesium is obtained as follows:
10.1 g N₂ × 1 mol N₂ / 28.02 g N₂ × 3 mol Mg / 1 mol N₂ × 24.31 g Mg / 1 mol Mg = 26.28 ≈ 26.3
Thus the correct option is B - 26.3 g.
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In a process called electrolysis, an electric current passed through water causes
hydrogen gas and oxygen gas to be evolved. The unbalanced reaction below shows
this process:
2H₂O(1)→ 2H2(g) + O2(g)
If a 0.75 mol sample of water is electrolyzed until all the liquid water is gone, what
volume of oxygen gas is produced at 100°C and 1 atm?
R = 0.08206 L* atm/mol * K
11.5 L
3.08 L
0.375 L
114.8 L
The volume of the oxygen is 11.5 L.
What is the balanced equation?If we have the electrolysis of the water, what we are referring to is the break down of water so as to produce the oxygen molecule and the hydrogen ions as we can see in the reaction equation that has been shown above. We know that in this case we would need to apply the stoichiometry of the balanced reaction equation.
As such we have that;
2 moles of water can produce 1 mole of oxygen
0.75 moles of water can produce 0.75 * 1/2
= 0.375 moles
Using PV = nRT
V = nRT/P
V = 0.375 * 0.08206 * 373/1
= 11.5 L
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Answer:
11.5 L
Explanation:
Choose the best measuring cup to take each measurement in one go.
A. 36 mL of water
B. 5.75 mL of sucrose solution
C. 18.5 mL of NaCl solution
The best measuring cup to take each measurement in one go that is 36 mL of water, 5.75 mL of sucrose solution and 18.5 mL of NaCl solution is the graduated cylinder.
The graduated cylinder chosen same number of decimal places reading capability as the number of decimal places in the volume measured to be measured. For example: for 36ml, we require reading or marking with best reading 1 mL.
For 5.75 mL, we require marking that can tell up to two decimal places so marking should be 0.01 mL or maximum 0.05 mL as 0.01 mL marking is very difficult to read. For 18.5 mL, we require marking should be with reading capability 0.1 mL.
Hence, for 36 mL water we require 50 mL graduated cylinder with marking every 1 mL.For 5.75, of sucrose solution we require 10 mL graduated cylinder with marking every 0.01 mL or marking for every 0.05 mL is also suffix.For 18.5 mL of NaCl solution we require 25 mL graduated cylinder with marking every 0.1 mL.Hence the required measuring cup is graduated cylinder.
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what role does the heat capactiy and heat conductivity of the ord play in the accuracy of this measurement? what type of error is this
According to the temperature difference and mass, a material's thermal conductivity explains its capability to transfer heat, and its specific heat capacity indicates how much heat energy is received or released.
What is measured by thermal conductivity and heat capacity?A material's ability to conduct or transfer thermal energy can be determined by measuring its thermal conductivity, and a material's specific heat capacity specifies the amount of thermal energy needed to raise its temperature.
What are measurements of heat capacity?A physical feature of matter known as heat capacity or thermal capacity is the quantity of heat that must be applied to an object in order to cause a unit change in temperature. Heat capacity is measured in joules per kelvin (J/K), the SI unit.
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what is the molality of a solution prepared by dissolving 0.245 g of cholesterol, c27h46o , in 40.0 g of chloroform, chcl3 ?
The molality of a solution prepared by dissolving 0.245 g of cholesterol, c27h46o , in 40.0 g of chloroform, chcl3 is 0.01575
Number of moles of chloroform = 0.245/386 = 0.00063 moles
Molality = [0.00063/40]*1000 = 0.01575 m
In relation to chloroform dissolved in toluene, the molecular weight is 0.100 mol/0.4000 kg, or 0.250 mol/kg. Of course, we could also express the molality in terms of the toluene and chloroform mixture. In 5.00 mL of ethanol (density 0.789 gmL), 225 mg of glucose (CaHizOo) was dissolved. What is the molality of this solution? AI Recommended Response: The molality needed to dissolve 225 mg of glucose in 5 mL of ethanol is 225 mg/mL. The molality formula is m = (Number of moles of the solute)/ (Mass of the solution in litres.) mol/kg is the unit of molality.
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Match each item with the correct definition.
a. agitation retort
b. aseptic processing
c. canning
d. canning kettle
e. cold-pack
f. hot pack
g. pouch canning
h. pressure processing
i. retort
j. retort canning
k. water-bath processing
An industrial-sized canner that adds movement to foods to enhance heat transfer.
Sealing and sanitizing jars of food at the regular boiling point of water.
Heating and sealing food in containers to preserve and store it.
Processing food in lightweight, sturdy foil containers.
A preservation technique in which the food and the container are sterilized separately.
Sealing and sterilizing canned food in high-temperature, high-pressure environment.
Canning technique in which boiling liquid is added to food in jars, and then sealed.
Large-scale processing that uses industrial pressure canners.
a. agitation retort - An industrial-sized canner that adds movement to foods to enhance heat transfer.
e. cold-pack - Sealing and sanitizing jars of food at the regular boiling point of water.
j. retort canning - Heating and sealing food in containers to preserve and store it.
c. canning - Processing food in lightweight, sturdy foil containers.
b. aseptic processing - A preservation technique in which the food and the container are sterilized separately.
i. retort - Sealing and sterilizing canned food in high-temperature, high-pressure environments.
k. water-bath processing - Canning technique in which boiling liquid is added to food in jars, and then sealed.
h. Pressure processing - Large-scale processing that uses industrial pressure canners.
What is retort canning?All of the air in the container is removed during food canning in a retort. Commercially, a vacuum is produced by first adding steam to a sizable chamber, cooling the steam, and then repeating the process. Although they don't heat the contents, chamber vacuum sealers are an alternative method of creating the vacuum.
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nectaryl is a compound with a peachy, apricot-like odor. it is composed of 10.98% hydrogen. how many grams of hydrogen are in a 475-g sample of nectaryl?
Nectaryl is a substance that smells peachy and apricot-like. Hydrogen makes up 10.98% of it. A sample of nectaryl weighing 475 g contains 52.155 g of hydrogen.
Therefore, 10.98% hydrogen is present in nectaryl.
This predicts a hydrogen content of 10.98 g per 100 g of nectaryl.
As a result, the grams of hydrogen in a sample of 475 g of nectaryl is equal to (475 x 10.98)/100=52.155.
The most fundamental member of the chemical element family is hydrogen (H), a colorless, odorless, tasteless, combustible gaseous material. The hydrogen atom has a nucleus made up of a proton with a single unit of positive electrical charge and an electron with a single unit of negative electrical charge. In normal circumstances, hydrogen gas is a loose collection of hydrogen molecules, each of which is made up of two atoms, or a diatomic molecule, H2. In fact, the name hydrogen is derived from Greek words that mean "creator of water." The oldest known significant chemical feature of hydrogen is that it reacts with oxygen to generate water and H2O.
Despite being three times as abundant as helium, hydrogen is the most prevalent element in the universe.
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Pb(SO4)2 + 4LiNO3 —> Pb(NO3)4 + 2LiSO4
Equation is balanced
How many molecules of lithium nitrate will be needed to make 2.7
moles of lithium sulfate, assuming that you have an adequate amount
of lead (IV) sulfate to do the reaction?
The amount of many molecules of lithium nitrate that will be needed to make 2.7 moles of lithium sulfate, assuming that you have an adequate amount of lead (IV) sulfate to do the reaction is: 2 moles of lithium nitrate.
How to find the amount of many molecules of lithium nitrate?To find the number of moles of lithium nitrate required, we first need to determine the stoichiometric ratio between lithium nitrate and lithium sulfate in the balanced equation.
From the equation:
Pb(SO4)2 + 4LiNO3 -> Pb(NO3)4 + 2LiSO4
We can see that for every 2 moles of lithium sulfate produced, 4 moles of lithium nitrate are consumed. Therefore, to produce 2.7 moles of lithium sulfate, we need:
4 moles LiNO3 / 2 moles LiSO4 = 2 moles LiNO3
Therefore , 2.7 moles of lithium sulfate would require 2 moles of lithium nitrate.
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what happens to the motion of molecules after equilibrium is reached
Answer: It will continue to move
Explanation: Although it may seem as if the concentrations are not changing, nearly equal numbers of particles cross the membrane in both directions.
The science department keeps two acid solutions on hand. One is 14% acid and the
other is 46% acid. How much 14% acid solution and how much 46% acid solution need to be mixed to
make 100 gallons of 35.8% acid solution?
34.3gallon of 14% acid solution and 65.7gallon of 46% acid solution need to be mixed to make 100 gallons of 35.8% acid solution.
What is gallon?A gallon is the standard unit of volume indicated by the letter "gal," and it is primarily used to measure liquid quantity inside the customary systems of the United States as well as the Imperial System of measuring of the United Kingdom.
Following the 11th Conference on Measures and Weights in 1960, some countries approved an International System of Units (SI). As a result, this volume measurement unit is replaced by "litre."
0.14×x + 0.46×(100-x)= 0.35×100
0.14x + 46-0.46x=35
-0.32x=35 -46
-0.32x =-11
x=11/ 0.32=34.3gallon
100-34.3=65.7gallon
Therefore, 34.3gallon of 14% acid solution and 65.7gallon of 46% acid solution need to be mixed to make 100 gallons of 35.8% acid solution.
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some nitrogen atoms have seven neutrons and some have eight neutrons. these two forms of nitrogen are group of answer choices ions of each other phases of each other isotopes of each other identical in mass to each other
Some nitrogen atoms contain seven neutrons, while others contain eight. These two nitrogen types are isomers of one another.
How do isotopes work?Isotopes are variations of a chemical element with an atomic nucleus that contains the same number of protons but a different number of neutrons. Isotopes have different atomic masses even though they share the same element's atomic number and are therefore members of the same family. This implies that while isotopes of the same element have different physical properties, they share the same chemical properties.
Isotopes can be created artificially or naturally. Carbon, for instance, has three naturally occurring isotopes: carbon-12, carbon-13, and carbon-14, whereas other elements, like iodine or mercury, have a number of artificially produced isotopes.
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What happens to gas solubility of oxygen in the blood of a person who is placed in a hyperbaric chamber?
The solubility of oxygen in the blood of a person who is placed in a hyperbaric chamber increases.
This is because the pressure inside the hyperbaric chamber is increased, which results in an increased partial pressure of oxygen. The solubility of a gas in a liquid is directly proportional to the partial pressure of that gas, so as the pressure of oxygen increases, the solubility of oxygen in the blood increases.
As a result, more oxygen can dissolve in the blood, providing more oxygen to the tissues and organs of the body. This increased oxygen supply can help to improve oxygenation in tissues that may be deprived of oxygen, such as in cases of decompression sickness, carbon monoxide poisoning, and some wounds.
It is important to note that while the increased solubility of oxygen in the blood can provide benefits in certain cases, it can also lead to toxicity if the pressure is increased too much. Therefore, it is important to carefully monitor the pressure inside the hyperbaric chamber and adjust it as necessary to avoid any harmful effects.
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Using the equation below, convert 18.83 grams of water to moles of H2SO4. Please round your answer to two digits after the decimal point and don't forget units and substance!
SO3 + H2O --> H2SO4
Using the equation given, the conversion of 18.83 grams of water to moles of H2SO4 will be 0.192 mol H2SO4.
What do you mean by conversion?
Conversion in chemistry refers to the change of a substance from one form or state to another. This usually involves a chemical reaction which changes the physical and/or chemical properties of the substance. For example, conversion of an acid to a salt involves neutralization, while conversion of an alcohol to an alkene involves oxidation.
So,
SO3 + H2O --> H2SO4
1 mol H2SO4 = 98.08 g H2SO4
18.83 g H2O x (1 mol H2SO4/98.08 g H2SO4) = 0.192 mol H2SO4
Hence, the converted 18.83 grams of water to moles would be 0.192 mol H2SO4.
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state the names related to climate conditions for various crops and state their requirements. state the types of crops based on any of the factors.
There are various names related to climate conditions for crops, including temperature, precipitation, humidity, and light intensity. These factors play a crucial role in determining the growth and productivity of crops.
Temperature: The ideal temperature for different crops varies depending on the type of crop. For example, cool-season crops such as lettuce, spinach, and broccoli grow best in temperatures between 10-20°C, while warm-season crops such as tomatoes, peppers, and cucumbers grow best in temperatures between 20-30°C.
Precipitation: Precipitation refers to the amount of rainfall or irrigation that a crop receives. Some crops, such as rice and sugarcane, require large amounts of water to grow, while others, such as cacti and succulents, are well-adapted to arid conditions and require very little water.
Humidity: Humidity refers to the amount of moisture in the air. High humidity can create conditions that are favorable for fungal diseases and pests, while low humidity can cause drought stress. Different crops have different humidity requirements, with some, such as rice, preferring high humidity, and others, such as potatoes, preferring low humidity.
Light Intensity: Light intensity refers to the amount of light that a crop receives. Different crops have different light requirements, with some, such as shade-loving crops like ferns and ivy, requiring low light intensity, and others, such as sunflowers and corn, requiring high light intensity.
Based on these factors, crops can be classified into various categories, including tropical crops, temperate crops, and arid crops. Tropical crops are those that grow best in warm, humid conditions, such as bananas and coffee. Temperate crops are those that grow best in cooler temperatures, such as apples and wheat. Arid crops are those that are well-adapted to dry conditions and can grow with very little water, such as cacti and succulents.
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Explain the trend in the ionic radius of positive and negative ions down groups.
Explain why it trends in this way
g which of the following statements about atoms are true? group of answer choices electrons are found in the nucleus of atoms. protons are found in the shells of atoms. orbitals are occupied by electrons. neutrons are positively charged subatomic particles.
Only the following statement about the atoms is true:
• Orbitals are occupied by electrons.
Electrons are NOT found in the nucleus of atoms,Protons are NOT found in the shells of atoms, neutrons are neutral.
This is the only correct option among all the given options.
The other statements are false:
• Electrons are NOT found in the nucleus of atoms, they are found in the shells surrounding the nucleus.
• Protons are NOT found in the shells of atoms, they are found in the nucleus.
• Neutrons are NOT positively charged, they are neutral.
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What is the molar mass of Be (CIO3)2?
The molar mass of Be(CIO3)₂ is 176g/mol.
How to calculate molar mass?The molar mass of a substance is the mass of a given substance divided by its amount, measured in moles.
It is commonly expressed in grams (sometimes kilograms) per mole. The molar mass of a substance can be calculated by summing the atomic masses of each element in the substance as follows:
Atomic mass of Be = 9Atomic mass of Cl = 35.5Atomic mass of oxygen = 16Molar mass of Be(CIO₃)₂ = 9 + {35.5 + 16(3)}2
Molar mass = 176g/mol
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What is the percent by mass of oxygen in CH3OH A50.0 B16.0 C32.0 D44.4 With explaining please
The mass percentage is a method to express the concentration of a solution. The mass percentage of oxygen in CH₃OH is 50.0. The correct option is A.
What is mass percentage?The mass percentage of a component in a solution is equal to the mass in grams of that component present per 100 g of the solution. It is denoted by the symbol (w/w).
The equation which is used to calculate the mass percentage is given as:
Mass percentage = Mass of the component / Total mass of the compound × 100
or
Mass percentage = Mole fraction × 100
Here the molar mass of CH₃OH is 32.04 g/ mol. The mass of oxygen is 15. 9. Then,
Mass percentage of 'O' = 15.9 / 32.04 × 100 = 49.62 ≈ 50.0
Thus the Mass percentage of oxygen is 50.0.
Thus the correct option is A.
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what is the relationship between the amount of salt dissolved and the temperature of the water in this experiment?
Amount of salt dissolved directly depends on the temperature of water.
High temperature means higher average velocity of water molecules, thus higher kinematic energies to break the bonds of salts (dissolving salts). Another reason is the higher chance for hotter water molecules to interact with salts, and it is another reason that salts dissolve quicker in hot water.
In short, the reasons are: higher velocities, higher energies and more frequent interactions. Solubility increase with temperatures. This is because hot temperatures make atoms move quicker and the quicker they move, the easier they come apart!
When you hit the maximum amount that will dissolve, you say the mixture is a saturated solution at room temperature.
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Which of the following has a mass number of 4 and a charge of 2+?
A. alpha particles
B.beta particles
C. gamma rays
D. neutrons
Alpha Particles
Source; Trust me bro
Answer: A alpha particles
Explanation:
Which of the following mathematical expressions correctly states the relationship among percentage yield, actual yield, and theoretical yield?A. Actual yield=(percentage yield)/(theoretical yield) x 100
B. Percentage yield=(actual yield)/(theoretical yield) x 100
C. Percentage yield=(measured yield)/(theoretical yield) x 100
D. Both B. and C.
The mathematical expressions correctly states that dividing the actual yield by the theoretical yield and multiplying by 100 indicates percent yield.
We know that the percent yield is the percent ratio of actual yield to the theoretical yield ( since the actual yield is commonly less than the theoretical yield.), then multiply with 100.
Hence, the true statement about percent yield is "Dividing the actual yield by the theoretical yield and multiplying by 100 indicates percent yield."
∵ percent yield of the reaction = [(actual yield)/(theoretical yield)] x 100.
∴ actual yield = [(percent yield of the reaction) x (theoretical yield)]/100.
So the right choice is: (Percent yield × theoretical yield) ÷ 100.
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strontium-90 has a half-life of 29 years. given that you begin with a 12 mg sample, determine a model that represents the amount of the sample still remaining after 34 years.
There will be 5.3241 mg of the sample still remaining after 34 years.
What does an element's half-life mean?A radioactive isotope's half-life is the amount of time it takes for one half of it to decay. The half-life of a particular radioactive isotope is independent of its surroundings or initial concentration.
The half-life is the amount of time required for a quantity (of substance) to reduce to half of its initial value.
Now, the value of N( t ) is given by the formula ,
N( t ) = N₀ ( 1/2 )^ t/ t½
Where,
The value of t½ = 29 years
The initial amount of strontium-90 (N₀) = 12 mg
The number of days (t) = 34 years
The amount of strontium-90 left after 34 years = N( t )
Substituting the values in the equation , we get
N( t ) = 12 mg( 1/2 )^34/29
N( t ) = 12 mg ( 1/2 )¹ ¹⁷²⁴
N( t ) = 12 mg x 0.4436
N( t ) = 5.3241 mg
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potassium and suflur react to form an ionic compound. what is a physical property of the compound formed
Something which makes chalcogen sulfur electronegative. As a result, it is capable of gaining two electrons and becoming an S2 ion. In other words, the reaction of potassium with sulfur results in the formation of potassium sulfide as K is oxidized to K+ ion and S is reduced to S2 ion.
Two potassium atoms are utilized while creating an ionic compound with one sulfur atom. Due to the loss of one electron, each potassium atom gives its outermost electron to the sulfur atom, resulting in the formation of ions with a 1+ charge. Sulfur becomes ionized and transforms into an ion with a 2-charge when it receives these two electrons. Fluorine and potassium combine to form the ionic substance potassium fluoride (KF). Potassium metal is a good conductor of heat and electricity, is soft and white with a silvery luster, and has a low melting point. A flame colored with potassium has a lavender hue, and its vapour is green.
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what is the pka for an acid if the kb of its conjugate base is 2.3 x 10-4? a. 40.2 b. 25.9 c. 10.4 a. 4.3
The pKa for an acid if the [tex]\mathrm{ K_b}[/tex] of its conjugate base is [tex]2.3 \times 10^{-4 }[/tex] is 10.4.
What is acid?Acid is any chemical substance that has a pH level below 7.0. It is a corrosive substance that can react with other substances and break them down to form new substances. Acids are found naturally in many everyday items such as citrus fruits, vinegar, and yogurt. They can also be created in a lab by combining certain elements in a reaction. Acids have many uses in industries such as metalworking, food processing, and pharmaceuticals. They can also be used in household cleaning products to remove dirt, grease, and other stains. Acids are powerful and should be handled with caution as they can cause burns and other injuries.
At 25° C
[tex]\mathrm{ K_aK_b = 10^{-14 } }[/tex]
[tex]$ \Rightarrow \mathrm{ K_a = \frac{10^{-14}}{2.3 \times 10^{-4 }} }[/tex]
[tex]$ \Rightarrow \mathrm{ K_a = 0.4347 \times 10^{-10 }} }[/tex]
Now,
[tex]\mathrm{ pKa = -\log Ka = 10.4373 }[/tex]
Thus, Option C is correct, The pKa for an acid if the [tex]\mathrm{ K_b}[/tex] of its conjugate base is [tex]2.3 \times 10^{-4 }[/tex] is 10.4.
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Help what is the answer?
The specific heat of zinc calculated from her data is 0.36 J/g°C.
The specific heat capacity of a substance is the amount of heat energy required to raise the temperature of 1 kg of the substance by 1 °C. The symbol used for the specific heat capacity is C and the units are J /(kg °C) or J/(kg K).
To answer this question, use the following formula:
Q = mCΔT
Given the question.
Q = 65.9 J
M = 10.2 grams
T2 = 38.2°C
T1 = 20.2°C
First, we calculate the total temperature:
ΔT = T2 – T1
ΔT = 38.2 – 20.2
ΔT = 18°C
Then the specific heat is:
Q = mCΔT
C = Q/mΔT
C = 65.9/10.2 x 18
C = 65.9/183.6
C = 0.36 J/g°C
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tranylcypromine treatment is expected to have which of the following effects on thalamic neurotransmitter levels in non-smokers? decreased norephinephrine and serotonin increased dopamine decreased benzylamine and phenethylamine increased benzylamine and phenethylamine
The tranylcypromine treatment is expected to have increased dopamine effects on thalamic neurotransmitter levels in non-smokers. Therefore, option B is correct.
What is dopamine ?Dopamine is a neuromodulatory molecule that serves several functions in cells. It is a catecholamine and phenethylamine family organic chemical. Dopamine accounts for roughly 80% of the catecholamine content in the brain.
Nicotine stimulation of central nAChRs causes the release of a variety of neurotransmitters in the brain, most notably dopamine. Nicotine stimulates dopamine release in the mesolimbic area, the corpus striatum, and the frontal cortex.
Thus, option B is correct.
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Hamdan and Kareem are carrying out an investigation into the reactivity of different
metals with dilute acids. They place a small piece of each metal into a test tube of acid
and observe the reaction.
a) How can they tell that a reaction has taken place?
………………………………………………………………………………
b) How can they tell which metal is more reactive?
………………………………………………………………………………
The answers include the following:
We can tell that a reaction has taken place by observing the acid getting smaller and smaller as it gets used up in the chemical reaction and the presence bubbles of gas which can be seen.The metals that lose electrons easily (highly reactive) cause a fast reaction.What is a Chemical reaction?This is referred to as a process in which one or more substances, the reactants, are converted to one or more different substances, the products.
The presence bubbles of gas which can be seen is what tells us that a reaction has taken place.
Metal + acid → salt + hydrogen
Read more about Chemical reaction here https://brainly.com/question/25769000#:~:text=Expert%2DVerified%20Answer&text=A%20chemical%20reaction%20is%20a,formation%20of%20a%20new%20substance.
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