Ch 3 Review Chemistry

Based on this analysis, which is the correct classification for air?

• element

• compound

• homogenous mixture

• heterogeneous mixture

Which of the following are characteristics that describe a liquid?

• Liquids have particles that move very rapidly.

• Liquids have particles that are very close to one another.

• Liquids can be compressed into a smaller volume.

• Liquids do not fill a container completely like gases would.

Which of the following is a chemical property of sodium?

• silver-white color

• density of 0.968 g/cm³

• soft at room temperature

• tarnishes when exposed to air

During recycling, ground glass is melted under light heat and poured into molds. Which type of change occurs as the glass melts?

• change in state

• change in mass

• change in reactivity

• change in composition

Tags

NGSS.MS-PS1-4

If data comes in that disproves a theory, what will happen to the theory?

• The theory will become a hypothesis.

• Nothing, theories are always right.

• The theory will no longer exist.

• The theory will be modified to fit the new data.

A student needs to use 5 x 10-2 M HCl in an experiment. All the labels state molarity in ordinary notation. In order for the student to use the correct molarity, what should the label on the bottle of HCl read?

• 500 M HCl

• 50 M HCl

• 0.5 M HCl

• 0.05 M HCl

Students are given a solid sample and asked to determine whether the sample is an element, compound, or mixture. One student observes that the sample is made up of particles of different colors, sizes, and shapes. When the students break off a piece of the sample, they notice that some particles are softer than others and some shine while others appear dull. What can the students conclude about their sample?

• It is an element.

• It is a compound.

• It is a homogeneous mixture.

• It is a heterogeneous mixture.

Which of the following describes the process of sublimation? Select TWO correct answers.

• a phase change with no intermediate liquid stage

• a phase change with an intermediate liquid stage

• a phase change of a solid melting to a liquid

• a phase change of a gas into a solid

• a phase change of a solid into a gas

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

A geologist was looking at a new mineral they found. The mineral sample was gray, non-metallic, had a density of 3.8 g/mL, and a volume of 48.3 mL. Of the observed properties listed below, which is considered to be an extensive property?

• Grey

• Non-metallic

• Density of 3.8 g/mL

• Volume of 48.3 mL

What is an intensive property?

• A property that depends on the amount of matter present.

• A property that does not depend on the amount of matter present.

• A property that can be observed or measured without changing the composition of matter, such as mass or volume.

• A property that changes the composition of matter.