Quiz 7- chem 1010

If the solubility of a compound is 30 grams per liter, how much solid is left undissolved if you mix 30 g of the compound in 0.33 L of solution? 20 g 10 g 0 g 33 g 30 g

20 g

How many molecules of sucrose are in 0.500 L of a 1.00 molar solution of sucrose? 6.02 × 1023 molecules of sucrose 3.01 × 1023 molecules of sucrose 1 gram 12.04 × 1023 molecules of sucrose 0.5 gram

3.01 × 1023 molecules of sucrose

How many molecules of sucrose are in a 0.500 moles of sucrose? 3.01 × 1023 molecules of sucrose 1 gram 0.5 gram 12.04 × 1023 molecules of sucrose 6.02 × 1023 molecules of sucrose

3.01 × 1023 molecules of sucrose

How many grams of sodium chloride are needed to make 15 L of a solution that has a concentration of 3.0 g per liter of solution? 45 g 141 g 5.0 g 30. g

45 g

How many molecules of sucrose are in 0.500 L of a 2.00 molar solution of sucrose? 1 gram 3.01 × 1023 molecules of sucrose 12.04 × 1023 molecules of sucrose 0.5 gram 6.02 × 1023 molecules of sucrose

6.02 × 1023 molecules of sucrose

How many molecules of sucrose are in 0.500 L of a 2.00 molar solution of sucrose? 6.02 × 1023 molecules of sucrose 12.04 × 1023 molecules of sucrose 0.5 gram 1 gram 3.01 × 1023 molecules of sucrose

6.02 × 1023 molecules of sucrose

How can you tell whether a sugar solution is saturated or not? Add more sugar. If it does not dissolve after mixing, the solution is saturated. As long as there are more water molecules than sugar molecules, there is a saturated solution. Add more sugar, if it dissolves, it is saturated. There will be a precipitate if the water is heated.

Add more sugar. If it does not dissolve after mixing, the solution is saturated..

In which of the following molecules will water induce a temporary dipole? All of the molecules. CO2 O2 N2

All of the molecules.

Which of the following substances is pure? All would be considered pure substances. a covalent compound consisting of one type of molecule an ionic compound consisting of sodium and chlorine ions an element

All would be considered pure substances.

Which of the following substances is pure? an ionic compound consisting of sodium and chlorine ions All would be considered pure substances. a covalent compound consisting of one type of molecule an element

All would be considered pure substances.

How is the solubility of a gas affected by temperature? As temperature goes up, the solubility stays the same. As temperature goes down, the solubility goes down. As temperature goes down, the solubility goes up. As temperature goes up, the solubility goes up.

As temperature goes down, the solubility goes up.

Chlorine, Cl2, is a gas at room temperature, but bromine, Br2, is a liquid. Explain. Bromine atoms are larger and this makes the formation of induced dipole-induced dipole attractions more favorable. The chlorine atoms are smaller and are therefore more polarizable. Chlorine atoms are larger and this makes the formation of induced dipole-induced dipole attractions more favorable. The bromine ions are held together by ionic bonds.

Bromine atoms are larger and this makes the formation of induced dipole-induced dipole attractions more favorable.

Which of the following would have the smallest number of induced dipole-induced dipole interactions? C8H18 C6H14 C12H26 C10H22

C6H14

List the following compounds in order of increasing boiling point: CI4, CBr4,CCl4, CF4. (CI4 = carbon tetraiodide) CI4, CBr4, CCl4, CF4 CI4, CCl4, CBr4, CF4 CF4, CBr4, CCl4, CI4 CF4, CCl4, CBr4, CI4

CF4, CCl4, CBr4, CI4

Which of the following might have the best solubility in water? O2 CH3CH3 Cl2 CH3OH

CH3OH

Which of the following molecules is most likely to show a hydrogen bonding interaction? A, B and C CH3OH H-CC-H CH3SH CH4

CH3OH

Which of the following molecules would you expect to be the most strongly attracted to a Cl- ion? Cl-Cl CCl4 F-F H-F

H-F

Which of the following molecules would you expect to be the most strongly attracted to a Cl- ion? F-F H-F CCl4 Cl-Cl

H-F

Which of the following describes reverse osmosis in the desalination of water? The water is heated until it evaporates and condenses in a pure form. High pressure saltwater is reacted with aluminum, which absorbs the sodium ions in an oxidation reaction. High pressure saltwater is forced against a semipermeable membrane and fresh water comes out. Saltwater is chemically reacted with aluminum particles, which chemically binds to the chloride ions.

High pressure saltwater is forced against a semipermeable membrane and fresh water comes out.

Which of the following describes reverse osmosis in the desalination of water? The water is heated until it evaporates and condenses in a pure form. High pressure saltwater is reacted with aluminum, which absorbs the sodium ions in an oxidation reaction. Saltwater is chemically reacted with aluminum particles, which chemically binds to the chloride ions. High pressure saltwater is forced against a semipermeable membrane and fresh water comes out.

High pressure saltwater is forced against a semipermeable membrane and fresh water comes out.

Which of the following describes the term concentration? It is the given amount of solution in a given container. It is the amount of solvent in a given amount of solution. It is the amount of solute in a given amount of solution. It is the given amount of solvent per amount of solute. It is what you are doing now to answer this question.

It is the amount of solute in a given amount of solution.

Which of the following describes the term concentration? It is the given amount of solution in a given container. It is the given amount of solvent per amount of solute. It is the amount of solvent in a given amount of solution. It is what you are doing now to answer this question. It is the amount of solute in a given amount of solution.

It is the amount of solute in a given amount of solution.

Which of the following molecules is most likely to show a dipole-dipole interaction? H-CC-H (linear geometry) CH4 (tetrahedral geometry) SO2 (bent geometry) CO2 (linear geometry)

SO2 (bent geometry)

If nitrogen, N2, were pumped into your lungs at high pressure, what would happen to its solubility in your blood stream? The greater the pressure, the greater the solubility. Nitrogen is not soluble in your blood. The greater the pressure, the lower the solubility. You cannot change solubility of a substance by changing the pressure.

The greater the pressure, the greater the solubility.

Which of the following statements best describes what is happening in a water softening unit? The hard ions in water are exchanged for ions like sodium that do not interact as strongly with soaps. The ions in the water softener are softened by chemically bonding with sodium. The hard ions are all trapped in the softener, which removes all ions from solution. The sodium is removed from the water, making the water interact less with the soap molecules.

The hard ions in water are exchanged for ions like sodium that do not interact as strongly with soaps.

Which of the following statements best describes what is happening in a water softening unit? The hard ions in water are exchanged for ions like sodium that do not interact as strongly with soaps. The sodium is removed from the water, making the water interact less with the soap molecules. The ions in the water softener are softened by chemically bonding with sodium. The hard ions are all trapped in the softener, which removes all ions from solution.

The hard ions in water are exchanged for ions like sodium that do not interact as strongly with soaps.

Which of the following statements best describes what is happening in a water softening unit? The ions in the water softener are softened by chemically bonding with sodium. The hard ions are all trapped in the softener, which removes all ions from solution. The hard ions in water are exchanged for ions like sodium that do not interact as strongly with soaps. The sodium is removed from the water, making the water interact less with the soap molecules.

The hard ions in water are exchanged for ions like sodium that do not interact as strongly with soaps.

What is the special property of a semipermeable membrane that makes osmosis possible? Ions only move one way through the membrane. The pores in the membrane only allow water to pass through. Only the ions travel through the membrane. Water only moves through the membrane in one direction.

The pores in the membrane only allow water to pass through.

What happens when the molecule-to-molecule attractions in the solute are comparable to those in the solvent? The material has only limited solubility in the solvent. The solute can have infinite solubility in the solvent. The solution will become saturated. The solute does not dissolve in the solvent.

The solute can have infinite solubility in the solvent.

What is the purpose of adding aluminum salts and a base to water during water treatment? It improves the taste. The aluminum removes the rust taste from the water The higher pH kills bacteria. The two together gel and trap dirt and bacteria

The two together gel and trap dirt and bacteria

What is happening at the molecular level when a polar molecule like water interacts with a typical sodium ion? The water molecule aligns such that the oxygen interacts with the sodium. The polarity of the water molecule is altered making the hydrogens more negatively charged. None of the answers are correct. The water molecule aligns such that the hydrogens interact with the sodium. The polarity of the water molecule is altered making the oxygen more positively charged.

The water molecule aligns such that the oxygen interacts with the sodium.

Would you expect to find more dissolved oxygen in polar or tropical ocean waters? Why? There would be more dissolved oxygen in the tropical oceans because the heated oxygen molecules in the air would collide with and mix into the water. There would be more dissolved oxygen in the polar oceans because the solubility of oxygen in water decreases with increasing temperature. There would be more dissolved oxygen in the tropical oceans because intense tropical storms mix up the atmospheric oxygen into the ocean water. There would be more dissolved oxygen in the polar oceans because the colder oxygen would "sink" and dissolve into the water.

There would be more dissolved oxygen in the polar oceans because the solubility of oxygen in water decreases with increasing temperature.

When you set a pot of tap water on the stove to boil, you'll often see bubbles start to form well before boiling temperature is ever reached. Explain this observation. These bubbles are formed as the surrounding gases from the air dissolve into the water as it is heated. They are very minute pockets of water in the gaseous phase. When they get large enough, the water will boil as this gas escapes. These initial bubbles are the gases that were dissolved in the water coming out of solution. The solubility of gases in water decreases with increasing temperature. These are dissolved salts heating up and escaping from the water.

These initial bubbles are the gases that were dissolved in the water coming out of solution. The solubility of gases in water decreases with increasing temperature.

Why might softened water not be good for some one who is trying to reduce their dietary sodium ion intake? The potassium used in the softener to replace the calcium and magnesium ions increases the sodium retention in the body. A person needs a certain level of calcium and magnesium in the water to help excrete the sodium from their body. The softened water leaches sodium from the body, so a person might not be getting the dietary recommended levels of sodium. Water softeners work by replacing the calcium and magnesium ions of the water with sodium ions; softened water contains increased levels of sodium ions.

Water softeners work by replacing the calcium and magnesium ions of the water with sodium ions; softened water contains increased levels of sodium ions.

What happens if you were to place a dilute solution that is in a bag made of a semipermeable membrane and were to then suspend it in a very concentrated solution? The size of the bag would not change. Water would move out of the suspended bag and the size of the suspended bag would decrease. All of the answers are possible depending on the concentrations of the solutions. Water would move into the suspended bag and the size of the suspended bag would increase.

Water would move out of the suspended bag and the size of the suspended bag would decrease.

Which of the following is the strongest attractive force? an ion-dipole interaction a dipole-induced dipole interaction a chemical bond a dipole-dipole interaction an induced dipole-induced dipole interaction

a chemical bond

What is a hydrogen bond? a special type of attraction involving any molecules that contain hydrogens a special type of dipole-dipole attraction involving hydrogen bound to any other atom a special type of dipole-dipole attraction involving hydrogen bound to a highly electronegative atom None of the answers are correct. a special type of dipole-dipole attraction involving hydrogen bound to another hydrogen atom

a special type of dipole-dipole attraction involving hydrogen bound to a highly electronegative atom

Which of the following intermolecular forces best describes why molecules like sucrose (which has many OH groups) are very water soluble? ion-dipole induced dipole-induced dipole hydrogen bonding dipole-induced dipole dipole-dipole

hydrogen bonding

Under which of the following conditions would you expect the highest solubility of oxygen gas in water? The O2 solubility is independent of temperature and pressure. high temperature and low O2 pressure above the solution high temperature and high O2 pressure above the solution low temperature and high O2 pressure above the solution low temperature and low O2 pressure above the solution

low temperature and high O2 pressure above the solution

In a solution of 77 percent nitrogen and 23 percent oxygen, which is the solvent? oxygen nitrogen both Gases cannot form solutions. neither

nitrogen

What is the difference between a dipole-dipole interaction and an ion-dipole interaction? one involves salts and water while the other doesn't involve water one involves ionic molecules interacting with other ionic molecules while the other deals with polar molecules one involves hydrogen bonding while the other does not None of the answers are correct. one involves dipole attraction between polar molecules while the other involves dipole interactions with ions

one involves dipole attraction between polar molecules while the other involves dipole interactions with ions

Which of the following solutions is the most dilute? one liter of water with 5 grams of sugar one liter of water with 10 grams of sugar one liter of water with 1 gram of sugar They all have the same volume so they all have the same concentration. one liter of water with 2 grams of sugar

one liter of water with 1 gram of sugar

In a solution made from one teaspoon of sugar and one liter of water, which is the solute? both sugar and water water the teaspoon sugar

sugar