A molecule created by dehydration reactions joining three glucose molecules together would have the chemical formula C18H32O16.
By removing water molecules, dehydration reactions cause the molecules to create new chemical connections with one another. Three glucose molecules would dehydrate together, joining the separate molecules to create a bigger molecule. Since it is a dehydration reaction, it means that when two molecules are linked together, there will be one molecule of water removed. In this case, the larger molecule would have three times the number of carbon resulting in the molecular formula C18H32O16.
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Convert 2.42 x 1023 atoms of Carbon to mols.
Match the following. PLEASE
Put responses in the correct input to answer the question. Select a response, navigate to the desired input and insert the response. Responses can be selected and inserted using the space bar, enter key, left mouse button or touchpad. Responses can also be moved by dragging with a mouse.
the use of antiseptics to kill microorganisms
French physician and researcher who first suggested that illness could be caused by microorganisms
one of the leading research institutions and universities in the United States and the site of the nation's first clinical research laboratory
an organism (as a bacterium) of microscopic or less than microscopic size, especially bacterium, virus, or fungus
a common food mold that is sometimes used to produce penicillin
sorry edge sucks and my screenshot is cropped
Antiseptics are agents used to decrease the microbial population on the skin surfaces. The correct matches are A. 3, B. 2, C. 5, D. 1, and E. 4.
What are antiseptics?Antispectics has been defined as the chemical substances often used to prevent and eliminate the growth of the microorganism on the surfaces of the skin. Thus, the correct match is A. 3.
Louis Pasteur has a paramount contribution to the field of microbiology as he suggested that microorganisms can cause diseases in organisms. Thus, the correct match is B. 2.
Johns Hopkins University is an American university and institution that leads clinical research and was founded in 1876. Thus, the correct match is C. 5.
Microorganisms are defined as organisms that are very small (micro) in size and are not visible without a microscope. Thus, the correct match is D. 1.
Penicillium mold is the common food mold used for the production of penicillin, an antibiotic used for various purposes. Thus, the correct match is E. 4.
Therefore, the correct matches are A. 3, B. 2, C. 5, D. 1, and E. 4.
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Your question is incomplete, but most probably your options were,
microorganismLouis Pasteurreduce the microbial population on the surface of the skinPenicillium moldJohns Hopkins UniversityWhat could Eric conclude about what happens when heat is added or removed from an object after he completed his test with the mug of hot chocolate?
When heat is added or removed from an object after he completed his test with the mug of hot chocolate Eric concludes that arrow A shows the direction heat flowed because the temperature of his hand increased as heat was absorbed by his hand. Therefore, option A is correct.
What is heat ?The term heat is defined as the transfer of kinetic energy from one medium or object to another, or from an energy source to a medium or object.
According to the description, Eric can conclude that when 'heat is either prepended or separated from an object after the completion of his test,' as arrow A shows the direction in which the heat has flown because his hands' temperature increased after the heat was absorbed by his hand.
It implies that heat is added when his hand's temperature rises and removed when the heat is removed.
Thus, option A is correct.
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Your question is incomplete, most probably your question was
Eric is investigating what happens when heat is added or removed from an object. First he places a mug of hot chocolate in this hand and records the temperature of the hot chocolate and the surface of his hand every five minutes for a total of 15 minutes. He repeats this procedure when investigating heat flow with an ice cube. Use the diagram to answer the question below. A flowchart illustration with two forward (right direction) arrows and two backward (left direction) arrows. The phrase Mug of chocolate is followed by the forward arrow A that leads to the word Hand. The word Hand is followed by the forward arrow C that leads to the phrase Ice cube. The word Ice cube is preceded by the backward arrow D that leads to the word Hand. The word Hand is preceded by a backward arrow B that leads to the phrase Mug of hot chocolate. What could Eric conclude about what happens when heat is added or removed from an object after he completed his test with the mug of hot chocolate? A. Arrow A shows the direction heat flowed because the temperature of his hand increased as heat was absorbed by his hand. B. Arrow A shows the direction heat flowed because the temperature of his hand increased as heat was released from his hand. C. Arrow B shows the direction heat flowed because the temperature of the hot chocolate changed as heat was absorbed by the mug. D. Arrow B shows the direction heat flowed because the temperature of the hot chocolate changed as heat was absorbed by his hand.
The overall or __________ force acting on this box is 5N to the left.
answer must be resultant force
Calculate the number of chlorine atoms present in a sample that has 3.2 × 1023 molecules of C2Cl4?
The sample contains 1.28 x 10²⁴ chlorine atoms, or 3.2 x 10²³ x 4.
Determine how many chlorine atoms are in a sample by using the Avogadro's number, which is 6.02 x 10²³ molecules of any substance per mole, as the formula for the question. The number of molecules or atoms in a sample is determined using this number.
Calculating of the sample's number of C₂Cl₄ molecules.
There are 3.2 x 10²³ C₂Cl₄ molecules in the sample.
Determine how many chlorine atoms are in one C₂Cl₄ molecule.
One molecule of C₂Cl₄ contains two chlorine atoms because it has two chlorine atoms.
Determine the sample's total number of chlorine atoms.
The total number of chlorine atoms in the sample is 1.28 x 10²⁴ because there are 3.2 x 10²³ molecules of C₂Cl₄ in the sample and each molecule contains two chlorine atoms.
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how many milliliters of 0.75 m sodium hydroxide are needed to neutralize 275 ml of 0.50 m sulfuric acid?
183.3 mL of 0.75 M sodium hydroxide is needed to neutralize 275 mL of 0.50 M sulfuric acid.
What is sulfuric acid ?Sulfuric acid is a strong and corrosive acid that is widely used in the industry. It is a colorless, odorless, and oily liquid, and is soluble in water. It is formed when sulfur dioxide gas reacts with water molecules, forming a solution of hydrogen sulfate and sulfate ions. Its chemical formula is H2SO4. Sulfuric acid is an oxidizing agent and is extremely reactive. It is also a strong acid, with a pH of around 1.
To solve this problem, we must first calculate how much acid is present in the sulfuric acid solution. We can do this by multiplying the volume (275 mL) by the concentration (0.50 M):
275 mL x 0.50 M = 137.5 mmol H2SO4
Next, we need to calculate how much base is needed to neutralize this amount of acid. We can do this by dividing the amount of acid by the molarity of the base:
137.5 mmol H2SO4 / 0.75 M NaOH = 183.3 mL NaOH
Therefore, 183.3 mL of 0.75 M sodium hydroxide is needed to neutralize 275 mL of 0.50 M sulfuric acid.
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Carbon monoxide (CO(g)) diffuses 1.068 times faster Than an unknown gas. Which of the following could be that gas?
O a. CO2 (0.04% of air)
O b. 02 (20.9% of air)
O c. Ar (0.9% of air)
O d. N₂ (78.1% of air)
N₂ (78.1% of air) could be that gas.
What is gas?
Gas is a form of matter that has no fixed shape or volume. It is made up of molecules that are in constant motion and are spread out in all directions, taking up the space available. Gas molecules usually have low density and are highly compressible, meaning that they can be compressed into a smaller space than their original volume. Gases can be composed of many different elements or compounds, including oxygen, nitrogen, carbon dioxide, and methane. Gas molecules are affected by temperature, pressure, and the amount of gravity present. When these factors are changed, the gas molecules react accordingly.
Therefore, N₂ (78.1% of air) could be that gas.
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a metal x reacts with oxygen to form metal oxide y used in cement industry. y dissolves in water producing z with hissing sound which is used for whitewashing.the clear solution of z reacts with co2 to form white precipitate.identify x, y, z and write chemical reactions involved
Metal x is most likely a metal such as aluminum or iron. When metal x reacts with oxygen in the air, it forms metal oxide y.
What do you mean by metal?
Metal is a broad term used to describe a family of materials consisting of a wide range of elements and alloys. These materials have many different properties and uses, including everything from structural support in construction to conductivity in electronics. Metals are malleable, strong, and durable, making them ideal for a variety of applications.
Furthermore, metal oxide y is used in the cement industry to increase the strength of the cement. When metal oxide y is dissolved in water, it produces a gas, z, with a hissing sound. This gas is used for whitewashing. When the clear solution of gas z reacts with carbon dioxide, it forms a white precipitate. This precipitate is a solid form of the metal oxide y and is used to further strengthen the cement.
X: Iron (Fe)
Y: Iron(III) oxide (Fe2O3)
Z: Iron (III) hydroxide (Fe(OH)3)
The chemical reactions involved:
Reaction 1: Fe + O2 → Fe2O3
Reaction 2: Fe2O3 + H2O → Fe(OH)3 + H2O
Reaction 3: Fe(OH)3 + CO2 → FeCO3 + H2O
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Initially, only H2 and I2 were present at concentrations of [H2]=3. 65M and [I2]=2. 00M. The equilibrium concentration of I2 is 0. 0700 M. What is the equilibrium constant, Kc, for the reaction at this temperature?
the equilibrium constant, Kc, for the reaction at this temperature to be [tex]4.55 x 10^-12[/tex]
The equation for the equilibrium constant, Kc, is defined as the ratio of the concentration of products raised to their stoichiometric coefficients, to the concentration of reactants raised to their stoichiometric coefficients. For the given reaction, the concentration of I2 at equilibrium is 0.0700 M and the initial concentrations of H2 and I2 are 3.65 M and 2.00 M respectively. By plugging these values into the equation for Kc, we can calculate the value of Kc to be [tex]4.55 x 10^-12[/tex] at this temperature. Initially, only H2 and I2 were present at concentrations of [H2]=3. 65M and [I2]=2. 00M.
Kc = [tex][I2]/([H2][I2])^2[/tex]
= [tex]0.0700 / (3.65 * 2.00)^2[/tex]
= [tex]4.55 x 10^-12.[/tex]
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I need help with my stoichiometry homework
Answer:
Below
Explanation:
First , note that TWICE as many moles of O2 are required as CH4
so ya need to figure out the number of moles in 12.54 g of CH4
From periodic table find weights of C and H
C = 12.011 H = 1.008 g / mole
so a mole of CH4 is 12.011 + 4 * 1.008 = 16.043 g / mole
now 12. 54 g / 16.043 g/mole = .78 mole of CH4
remember from above, you need twice as many moles of O2
.78 x 2 = 1.56 moles of O2
how would the carbon cycle be disrupted if human activities released an extremely large amount of carbon dioxide into the atmosphere?
If human activities released an extremely large amount of carbon dioxide into the atmosphere The carbon cycle would be affected in a number of ways.Due to the greenhouse effect,
increasing quantities of carbon dioxide in the atmosphere would result in warmer global temperatures. If human activities caused an unusually high amount of carbon dioxide to be emitted into the atmosphere. As a result, the oceans would evaporate more water, increasing the atmospheric concentration of carbon dioxide. More extreme weather events, including hurricanes and droughts, could disrupt ecosystems and reduce plants' capacity to absorb carbon dioxide as a result of the warmer temperatures and rising carbon dioxide levels. This might lead to an even greater increase in carbon dioxide levels in the atmosphere, resulting in a vicious cycle of rising temperatures and more weather events.
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if equimolar concentrations of each of the following species are injected into a previously evacuated vessel, which species will have the highest concentration at equilibrium?
The concentration of a species at equilibrium depends on its equilibrium constant, which is a measure of the relative stability of the reactants and products.
The concentration of a species at equilibrium depends on its equilibrium constant, which is a measure of the relative stability of the reactants and products. The larger the equilibrium constant, the more favorable the reaction and the higher the concentration of the product at equilibrium.In order to determine which species will have the highest concentration at equilibrium, we need to compare the equilibrium constants of the reactions. However, without knowing the specific reactions and conditions, it is not possible to determine which species will have the highest concentration at equilibrium.It's important to note that the initial concentrations of the species can also affect the final concentration at equilibrium, but they are not the only factor. Other factors, such as the temperature, pressure, and the presence of catalysts or inhibitors, can also influence the concentration of the species at equilibrium.
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I have answered this question.
PLEASE HELP!!! Why do you think that we depend primarily on non-renewable energy sources?
Do you think that our dependence on nonrenewable energy sources makes sense?
We think that our dependency is primarily on non-renewable energy sources because these resources are required and important for our daily lives.
Why we are dependent on non-renewable resources?We depend on non-renewable energy for example fossil fuels resource because of the reason that they are energy-rich and comparatively cheap to process. But a big problem with fossil fuels resource, apart from them being in limited supply, is that burning them releases carbon dioxide into the atmosphere.
We think today that humanity's use of fossil fuels resource is damaging our environment. Fossil fuels resource which is non-renewable energy cause pollution where they are produced and used, and their continuous use is causing long-term harm to the climate of our planet.
So we can conclude that our dependence on nonrenewable energy sources makes sense because our lives depend on them.
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when the following solutions are mixed together, what precipitate (if any) will form? a. feso4(aq) 1 kcl(aq)
Since all of the reactants and products are soluble in water, no precipitate is produced.
What is the solution?
A solution is a specific kind of homogeneous mixture made up of two or more substances that are used in chemistry. A solute is a substance that has been dissolved in a solvent, which is the other substance in the mixture.
The positive and negative ions of two ionic compounds swap positions during a double-replacement reaction to create two new compounds. An example of a double-replacement reaction, also known as a double-displacement reaction, is:
AB+CD→AD+CB
A and C are positively charged cations in this reaction, whereas B and D are negatively charged anions. In an aqueous solution, double-replacement reactions typically take place between substances. A reaction must produce one of the following in order to take place: a solid precipitate, a gas, or a molecular compound like water.
The reaction Iron (II) Sulfate and potassium chloride is
FeSO₄ + 2KCl → FeCl₂ + K₂SO₄
Both FeCl₂ and K₂SO₄ are liquid form.
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A scuba tank has a volume of 11.0 L. What volume of gas in liters at 0.950 atm is required to completely fill the tank to a pressure of 45.0 atm, assuming no change in the temperature of the gas?
The volume of gas in liters at 0.950 atm required to completely fill the tank to a pressure of 45.0 atm is 0.23L.
How to calculate volume?The volume of a gas can be calculated by using the Boyle's law equation as follows:
P₁V₁ = P₂V₂
Where;
P₁ = initial pressureV₁ = initial volumeP₂ = final pressureV₂ = final volumeAccording to this question, a scuba tank has a volume of 11.0 L. The volume required at an increased pressure can be calculated as follows:
11 × 0.95 = 45 × V
10.45 = 45V
V = 0.23L
Therefore, 0.23L is the volume required
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if 3.71 g of titanium metal is reacted with 7.42 g of chlorine gas, cl2 , to form 9.1 g of titanium(iv) chloride in a combination reaction, what is the percent yield of the product?
The percent yield of a reaction is the percentage of the theoretical yield that is actually obtained in the experiment which is 59.9%.
To calculate the percent yield of the reaction between titanium metal and chlorine gas to form titanium(IV) chloride, the following calculation must be made:
Actual yield / Theoretical yield x 100
The actual yield in this reaction is 9.1 g of titanium(IV) chloride, and the theoretical yield can be calculated from the balanced chemical equation:
3.71 g Ti + 7.42 g Cl2 → TiCl4 + 3 g Cl2
The theoretical yield is calculated by multiplying the moles of titanium metal by the molar mass of titanium(IV) chloride:
3.71 g Ti / (47.90 g/mol) = 0.0777 mol Ti × (193.86 g/mol) = 15.2 g TiCl4
The percent yield of the reaction is then:
9.1 g TiCl4 / 15.2 g TiCl4 ×100 = 59.9% yield
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what information about a compound can be obtained by the use of a mass spectrometer? select all that apply.
Mass spectrometry, also called mass spectroscopy, analytic technique by which chemical substances are identified by the sorting of gaseous ions in electric and magnetic fields according to their mass-to-charge ratios. The instruments used in such studies are called mass spectrometers and mass spectrographs.
A mass spectrometer can be used to obtain the following information about a compound:
Molecular weight or mass of the compound's molecular ions.
Elemental composition of the compound.
Structural information such as the molecular formula, the molecular ion's isotopic distribution and the fragmentation pattern of the molecular ions.
Identification of unknown compounds based on their mass spectral data comparison with known spectra in databases.
Quantitative analysis of the amounts of different isotopes or chemical species in a sample.
Detection of impurities and contaminants in a sample.
Analysis of the stability and reactivity of compounds through the study of their fragmentation patterns.
Analysis of isotopic labeling patterns in biochemistry, drug metabolism and pharmaceuticals research.
A magnetic field is a picture that we use as a tool to describe how the magnetic force is distributed in the space around and within something magnetic. [Explain]
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a person with a blood alcohol concentration of 0.03% (v/v) is considered over the legal limit. if the blood plasma volume is 3.0 l, how many ml of alcohol does this concentration represent? group of answer choices
if a person with blood alcohol concentration of 0.03% has the blood plasma volume is 3.0 . It contains 9ml of alcohol.
To determine the amount of alcohol represented by a blood alcohol concentration of 0.03% (v/v), we can use the following formula:
amount of alcohol (mL) = (blood alcohol concentration) x (blood plasma volume)
Plugging in the given values, we get:
amount of alcohol (mL) = (0.03%) x (3.0 L)
Since 1 L = 1000 mL, we can convert the blood plasma volume to milliliters:
amount of alcohol (mL) = (0.03%) x (3000 mL)
Finally, we can multiply the two quantities to get the amount of alcohol in milliliters:
amount of alcohol (mL) = 0.03% x 3000 mL = 9 mL
So, a blood alcohol concentration of 0.03% (v/v) in a person with a blood plasma volume of 3.0 L represents 9 mL of alcohol.
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a loss of 0.4 mg of occurs in the course of an analysis for that element. calculate the percent relative error due to this loss if the mass of in the sample is
The percent relative error due to the loss of 0.4 mg is equal to the loss divided by the mass of the element, multiplied by 100.
What is relative error ?Relative Error is an expression of the difference between an approximate or measured value and an exact or known value. It is usually expressed as a percentage and is a measure of accuracy. It is calculated by dividing the absolute error by the exact value and multiplying the result by 100. Relative Error can be used to compare the accuracy of different measurements. For example, if one measurement of a quantity is more accurate than another, the relative error of the less accurate measurement will be greater. In addition, Relative Error can be used to measure the accuracy of a calculation or an experiment. The relative error of a calculation or experiment is the difference between the measured or calculated value and the actual value of the quantity being measured or calculated.
Relative Error = (0.4 mg / 0.6 mg) * 100 = 66.67% Therefore, the percent relative error due to the loss of 0.4 mg is 66.67%.
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you have 3 kg of ice at -5oc. it is converted to water of temperature 92oc. what was the entropy change in the process? the latent heat of fusion is lf
The resulting ΔS will be the entropy change in the process of converting 3 kg of ice at -5°C to water at 92°C.
The entropy change in the process can be calculated using the equation ΔS = ΔH/T, where ΔH is the change in enthalpy and T is the temperature.
In this process, the ice at -5°C is being converted to water at 92°C. The change in enthalpy, ΔH, is equal to the latent heat of fusion, Lf, plus the change in enthalpy of the water from -5°C to 92°C. This can be calculated using the equation ΔH = 3 kg * Lf + 3 kg * 4.18 J/g°C * (92°C - (-5°C)).
The entropy change, ΔS, can then be calculated using the equation ΔS = ΔH/T, where T is the temperature of the water, 92°C. The resulting ΔS will be the entropy change in the process of converting 3 kg of ice at -5°C to water at 92°C.
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assuming it behaves as an ideal gas, the average translational kinetic energy for a single molecule of so3(g) at 416 k is:
The average translational kinetic energy for a single molecule of SO3(g) at 416 K is approximately 0.864 x 10^-20 J.
The average translational kinetic energy of an ideal gas molecule can be calculated using the equation:
KE = (3/2)kT
where KE is the average translational kinetic energy, k is the Boltzmann constant (1.38 x 10^-23 J/K), and T is the temperature in Kelvin.
Given that the temperature of SO3(g) is 416 K, the average translational kinetic energy can be calculated as follows:
KE = (3/2)k * 416 K = (3/2) * (1.38 x 10^-23 J/K) * 416 K
KE = (3/2) * (1.38 x 10^-23 J/K) * 416 K
KE = (3/2) * (0.576 x 10^-20 J)
KE = 0.864 x 10^-20 J
So, the average translational kinetic energy for a single molecule of SO3(g) at 416 K is approximately 0.864 x 10^-20 J.
The units of this result are joules, which are the standard units of energy.
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10. how many grams of silver chloride can be prepared by the reaction of 100.0 ml of 0.20 m silver nitrate with 100.0 ml of 0.15 m calcium chloride?
Approximately 14.25 grams of silver chloride can be prepared by the reaction of 100 ml of 0.20 M silver nitrate with 100 ml of 0.15 M calcium chloride.
The reaction between silver nitrate and calcium chloride results in the formation of silver chloride and calcium nitrate. To calculate the amount of silver chloride produced, we can use the balanced chemical equation for the reaction. The balanced equation is AgNO3 + CaCl2 -> AgCl + Ca(NO3)2. Based on the stoichiometry of the reaction, every mole of silver nitrate reacts with one mole of calcium chloride to form one mole of silver chloride. The number of moles of each reactant can be calculated using the molarity and volume of each solution. The number of moles of each reactant can be compared to determine the limiting reagent. The amount of silver chloride produced can then be calculated by multiplying the number of moles of silver chloride by its molar mass.
n = M × V = 0.15 M × 0.1 L = 0.015 moles
m = n × MM = 0.015 moles × 143.32 g/mol = 2.15 g
Therefore, 2.15 g of silver chloride can be prepared by the reaction of 100.0 mL of 0.20 M silver nitrate with 100.0 mL of 0.15 M calcium chloride.
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how many moles of silver will be produced if 6.25 moles of copper are completely reacted?
As per the reaction, one mole of Cu gives one mole of silver. Then, 6.25 moles copper completely reacts to give 6.25 moles of silver metal.
What is copper ?Copper, Cu is 29th element in periodic table. It is a transition metal in d-block. As all other transition metals copper can exhibit variable oxidation states.
Copper reacts silver nitrate giving silver metal and copper nitrate. This an example of redox reaction in which copper is oxides and silver is reduced.
As per the balanced reaction one mole of copper reacts completely to give one mole of silver metal. Therefore, 6.25 moles of copper metal will give 6.25 moles of silver metal.
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The chemical reaction in your question probably was:
[tex]\rm Cu + AgNO_{3} \rightarrow Ag + CuNO_{3}[/tex]
a homogeneous mixture varies from a heterogeneous mixture ion that a homogenous mixture has properties that
A homogeneous mixture has the same composition all the way through. The composition of a heterogeneous mixture varies. Mixtures are classified into three types based on particle size: solutions, suspensions, and colloids. A mixture's components retain their own physical properties.
What are the properties of homogeneous and heterogeneous mixtures?Heterogeneous mixtures have distinct components, whereas homogeneous mixtures appear uniform throughout. A solution is the most common type of homogeneous mixture, and it can be solid, liquid, or gas.
A homogeneous mixture is one in which different parts (such as salt and water) are uniformly combined to form a new substance (salt water), whereas a heterogeneous mixture contains parts that remain separate.
Thus, a homogeneous mixture varies from a heterogeneous mixture ion that a homogeneous mixture has properties that the same composition throughout.
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Please help!!!
From this lesson, you should be able to answer the following focus questions:
What are the transition points for each phase change?
What is the effect of energy in phase transitions of matter?
How are changes in temperature and states of matter represented in heating and cooling curves?
The transition points for each phase change are the melting point, boiling point, freezing point, and condensation point.
The melting point is the temperature at which a solid substance melts and turns into a liquid.
The boiling point is the temperature at which a liquid turns into a gas. The freezing point is the temperature at which a liquid turns into a solid, and the condensation point is the temperature at which a gas turns into a liquid.
The effect of energy in phase transitions of matter is that it is required to change the phase of matter.
For example, when a solid is heated, energy is added to it, which causes its temperature to increase until it reaches its melting point.
At the melting point, the energy causes the solid to melt and become a liquid. Similarly, when a liquid is heated, energy is added to it, causing its temperature to increase until it reaches its boiling point. At the boiling point, the energy causes the liquid to turn into a gas.
Changes in temperature and states of matter are represented in heating and cooling curves by plotting temperature against time.
Heating curves show the change in temperature of a substance as heat is added, and cooling curves show the change in temperature of a substance as heat is removed.
The flat regions on the curve represent the phase changes, where the energy being added or removed is being used to change the state of the substance rather than to increase or decrease its temperature.
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what is the maximum volume of 1 m hcl that this buffer can hold before the ph falls by more than 1 ph unit? g
The maximum volume of 1 M HCl that can be added before the pH falls by more than 1 pH unit is 10 liters.
What is volume?Volume is the measure of the amount of space occupied by an object or material. It is a three-dimensional measure, meaning that it is the measure of a space along all three axes (length, width, and height). Volume is typically represented by the letter V, and is measured in cubic units (centimeters, meters, feet, etc).
The maximum volume of 1M HCl that this buffer can hold before the pH falls by more than 1 pH unit depends on the buffering capacity of the buffer. Buffers resist changes in pH when small amounts of acid or base are added. The buffering capacity is determined by the ratio of the concentrations of the conjugate acid-base pair in the buffer. The higher the ratio, the higher the buffering capacity.
For example, if the buffer is composed of 0.1 M acetic acid and 0.1 M sodium acetate, the buffer has a buffering capacity of 10. This means that 10 moles of HCl can be added before the pH falls by more than 1 pH unit. Therefore, if the buffer has a buffering capacity of 10, the maximum volume of 1 M HCl that can be added before the pH falls by more than 1 pH unit is 10 liters.
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Which substance contains bonds that involved the transfer of electrons from one atom to another ?
1)ch4
2)h2o
3)nh3
4)fecl3
Electrons are transferred from one atom to the other during ionic bonding. Among the given compounds, FeCl₃ is an ionic compound in which three electrons are transferred from Fe atom each chlorine.
What are ionic compounds ?Ionic compounds are formed between metals and non metals. Metals are electro rich and easily loss one or more electron from their valence shell. Nonmetals are mostly electronegative and will gain electrons to achieve octet.
Amon the given compounds all are covalent covalent compounds except FeCl₃. In ferric chloride, Fe is in +3 oxidation state and losses three electrons each for three chlorine atoms.
Cl contains 7 valence electrons and it need one more electron to achieve octet. Hence, each Cl gains one electron from the Fe metal. Hence, option 4 is correct.
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How is energy transferred when NaCl dissolves in water?
When NaCl dissolves in water, energy is transferred through a process called endothermic dissolution. This means that the process of dissolving NaCl in water requires the absorption of energy from the surrounding environment.
The energy is used to overcome the attractive forces between the NaCl ions and the water molecules, allowing the ions to separate from one another and become surrounded by water molecules. The energy required for this process comes from the surrounding water, causing its temperature to decrease.
In other words, when NaCl dissolves in water, the process absorbs heat energy from the water, causing its temperature to decrease. This energy transfer can be observed through a decrease in temperature or by measuring the change in enthalpy (ΔH) of the system.
Overall, the process of dissolving NaCl in water is an example of an endothermic reaction, where energy is absorbed from the surroundings and the temperature of the system decreases.
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Pt 1.
3 Cu + 8HNO3 --> 3 Cu(NO3)2 + 2 NO + 4 H2O
In the above equation, how many moles of water can be made when 39 moles of HNO3 are consumed?
Pt 2.
Sodium chlorate decomposes into sodium chloride and oxygen gas as seen in the equation below.
2NaClO3 --> 2NaCl +3O2
How many moles of NaCl were produced by 10 moles of NaClO3? Round your answer to the nearest whole number.
Pt 3.
Sodium chlorate decomposes into sodium chloride and oxygen gas as seen in the equation below.
2NaClO3 --> 2NaCl +3O2
How many moles of NaClO3 were needed to produce 98 moles of O2? Round your answer to the nearest whole number.
Pt 4.
S + 6 HNO3 --> H2SO4 + 6 NO2 + 2 H2O
In the above equation, how many moles of water can be made when 55 moles of HNO3 are consumed?
Pt 5.
3 Cu + 8HNO3 g 3 Cu(NO3)2 + 2 NO + 4 H2O
In the above equation how many moles of NO can be made when 80 moles of HNO3 are consumed?
Pt 6.
2 NH3 + 3 CuO g 3 Cu + N2 + 3 H2O
In the above equation how many moles of N2 can be made when 8 moles of CuO are consumed?
Pt 7.
2 NH3 + 3 CuO g 3 Cu + N2 + 3 H2O
In the above equation how many moles of water can be made when 87 moles of NH3 are consumed?
Answer:
Pt 1. 39 moles of HNO3 will make 78 moles of water.
Pt 2. 10 moles of NaClO3 will produce 20 moles of NaCl.
Pt 3. 98 moles of O2 will require 49 moles of NaClO3.
Pt 4. 55 moles of HNO3 will make 110 moles of water.
Pt 5. 80 moles of HNO3 will make 160 moles of NO.
Pt 6. 8 moles of CuO will produce 16 moles of N2.
Pt 7. 87 moles of NH3 will make 261 moles of water.
how would you make up 100 ml of 50 mm tris-hcl buffer at ph 7.4 in a lab, using the 0.5m tris base stock solution, and any other required materials?
To make 100 ml of 50 mM Tris-HCl buffer at pH 7.4 in a lab, you can follow these steps:
Measure out the desired amount of Tris base stock solution, which has a concentration of 0.5 M. For 100 ml of 50 mM Tris-HCl buffer, you will need 50 mM / 0.5 M = 0.1 moles of Tris base.
Transfer the calculated amount of Tris base to a suitable container and add distilled water to make up the desired volume (100 ml in this case).
Adjust the pH of the solution to 7.4 using a suitable buffer such as HCl or NaOH. To do this, you can add a small amount of the acid or base at a time and measure the pH until you reach the desired value of 7.4.
Stir the solution until it reaches homogeneity and the pH is stable. You can measure the pH again to confirm that it is 7.4.
Store the Tris-HCl buffer at room temperature in a suitable container until it is ready to be used.
It is important to note that the pH of the buffer should be checked and adjusted if necessary before use, as pH drift may occur over time.
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