chem matter

Which statement best describes the formation of a solution? A large amount of solute is dissolved in a smaller amount of solvent. A small amount of solute is dissolved in a larger amount of solvent. A small amount of solvent is dissolved in a larger amount of solute. A large amount of solvent is dissolved in a larger amount of solute.

A small amount of solute is dissolved in a larger amount of solvent.

Which statement best describes a true solution? A true solution will settle out after a short period of time. A true solution coagulates when heated or boiled. A true solution will not separate in a centrifuge. A true solution has a cloudy appearance.

A true solution will not separate in a centrifuge.

Which statement describes a physical property of copper? It reacts with strong acids. It can be reshaped by a force. It ignites at high temperatures. It can combine with oxygen.

It can be reshaped by a force.

hich is a characteristic of a homogeneous mixture that is a liquid? It exhibits the Tyndall effect. Brownian motion is not visible in it. It cannot be separated using filtration. It has at least two phases.

It cannot be separated using filtration.

Which is a characteristic of a solution? Its particles scatter light. Its particles are evenly distributed. Its particles settle out. It has large suspended particles.

Its particles are evenly distributed.

Which is true about the dissolving process in water? Nonpolar solutes dissolve easily in water. Solute molecules surround water molecules. Molecules or ions of a solute spread throughout the water molecules. Water molecules are repelled by solute ions at the surface of the solute.

Molecules or ions of a solute spread throughout the water molecules.

A scientist observes that the electrical resistance of a superconducting material drops to zero when the material is cooled to very low temperatures. Which of the following statements best describes what the scientist is observing? The scientist is observing the electrical power of a superconductor. The scientist is observing the temperature of a superconductor. The scientist is observing an intensive property of a superconductor. The scientist is observing an extensive property of a superconductor.

The scientist is observing an intensive property of a superconductor.

Which is true about dissolving a polar substance in water? The solvent particles are all nonpolar molecules. The solute particles are carried into the solution. The solute particles have no attraction for the solvent molecules. The solute particles are very different from the solvent molecules.

The solute particles are carried into the solution.

Which is the second step in the dissolving process? The solute is mixed with the solvent. The solute ions are carried into the solution. The solvent molecules surround the solute particles. The solvent molecules are attracted to the surface of the solute particles.

The solvent molecules surround the solute particles.

Which is a characteristic of mixtures? They are chemically bonded together. They can be classified as pure substances. They have fixed ratios between their components. They can be separated by physical processes.

They can be separated by physical processes.

Which best describes an element? a pure substance a type of a mixture a pure compound an impure substance

a pure substance

What can a drop of liquid mercury be described as? a pure substance and a compound an impure substance that is reactive an impure substance that is unreactive a pure substance and an element

a pure substance and an element

The chemical formula for an emerald is Be3Al2(SiO3)6. An emerald can be described as a pure substance because it is a compound. a pure substance because it is an element. an impure substance because it is chemically combined. an impure substance because it is a mixture.

a pure substance because it is a compound.

What are homogeneous mixtures of metals commonly called? alloys colloids compounds suspensions

alloys

Which list includes only physical properties? density, reactivity, and conductivity boiling point, conductivity, and color color, odor, and flammability flammability, reactivity, and ductility

boiling point, conductivity, and color

A student performs the following experiment.Step 1: She pours a colorless solution into a beaker that contains another colorless liquid. Yellow particles appear in the liquid.Step 2: She lets the yellow particles settle in the beaker and then separates the colorless liquid by decantation. What has most likely occurred in the beaker? a chemical change in step 1 and a physical change in step 2 a physical change in step 1 and a chemical change in step 2 chemical changes in both step 1 and step 2 physical changes in both step 1 and step 2

chemical changes in both step 1 and step 2

Which is an intensive property of a substance? density volume length mass

density

Which of these is an example of investigating an intensive property? weighing sand in a bag measuring the length of wire determining if a rock is magnetic recording the volume of water in a cylinder

determining if a rock is magnetic

Which method would be best for separating the components of a mixture that is made from two different liquids? distillation evaporation filtration sorting

distillation

A teacher makes the following statement."Gasoline boils at a relatively low temperature (about 150°C). The kerosene is removed at around 200°C, followed by diesel oil at 300°C and fuel oil at around 370°C."What topic is the teacher most likely talking about? distillation of a mixture filtration of a pure substance evaporation of a mixture sorting of a pure substance

distillation of a mixture

Which is a substance that is made up of only one type of atom? compound element solution mixture

element

Which term refers to a property that depends only on the amount of a substance? flammability extensive intensive reactivity

extensive

Which refers to a mixture that contains more than one phase in which the characteristics of the particles vary throughout the mixture? compound element heterogeneous homogeneous

heterogeneous

Which method would increase the solubility of a gas? Which method would increase the solubility of a gas? increasing the pressure stirring the solvent quickly increasing the temperature decreasing the amount of solvent

increasing the pressure

Which factor increases the rate of dissolution in an unsaturated solution? increasing the temperature decreasing the surface area decreasing the amount of solute increasing the amount of solvent

increasing the temperature

A chemist dissolved crystals of an unknown substance into water at room temperature. He found that 33 g of the substance can be dissolved into 100 mL of water. What property of the unknown substance was the chemist most likely investigating? its solubility its rate of dissolution its chemical reaction to water its reaction to temperature changes

its solubility

Which substance is an example of a colloid? milk tomato juice sand and water sugar and water

milk

A chemist is studying an unknown substance and could break the substance into its elemental components only by using chemical means. Based on this observation, how should the unknown substance be classified? impure substance solution mixture pure substance

pure substance

Bromine, a liquid at room temperature, has a boiling point of 58°C and a melting point of -7.2°C. Bromine can be classified as a compound. impure substance. mixture. pure substance.

pure substance

Which of these is a chemical property of a substance? texture ductility reactivity conductivity

reactivity

A nonaqueous solution has a solvent that is not water. Which is an example of a nonaqueous solution? paint steel orange juice shaving cream

steel

A beaker contains a solution. A single solute crystal is added to the solution. Immediately, crystals form in the solution. Which term best describes the solution before the crystal was added? supersaturated unsaturated diluted saturated

supersaturated

Which best describes the Tyndall effect? the scattering of light by solutes in a mixture the scattering of light by solvent in a solution the scattering of light by solutes in a solution the scattering of light by particles in a mixture

the scattering of light by particles in a mixture

A chemist has dissolved a certain substance in water. The chemist knows that more of the substance could be dissolved into the water before it stops dissolving. Therefore, the current solution is

unsaturated

In which situation can a mixture always be called a solution? when one of its components is a gas when there is no solvent in the mixture when its components are made up of different types of particles when the mixture is homogeneous

when the mixture is homogeneous