Unit 2 Chemistry

A solution of solids is a(n)___________.

alloy

Which of these is not a homogeneous mixture?

oil and vinegar salad dressing

A heterogeneous mixture is poured through a piece of filter paper that is positioned over a beaker. What is the substance that is collected in the beaker?

Not enough information is given.

In the chemical reaction shown above, what is the beginning mass of mercuric oxide?

216 grams

When one substance changes identity, it exhibits a(n) __________.

chemical property

________ is a separation technique that produces highly pure solids.

crystallization

Which of the following is not a state of matter? a.) solid b.) liquid c.) gas d.) density

d.) density

Which is a vapor? a.) helium b.) hydrogen c.) oxygen d.) steam

d.) steam

Which of the following is a pure substance? a.) soda b.) gun powder c.) sugar water d.) steam

d.) steam

A technique that uses the differences in boiling point to separate homogeneous mixtures is _________.

distillation

Which of the following is not evidence of a chemical reaction?

melting

A(n) ____________ is a transition from one state of matter to another.

phase change

A characteristic that can be observed or measured without changing the sample's composition is ________________.

physical property

In the chemical reaction shown above, how do you classify hydrogen and oxygen?

products

How can the law of conservation of mass apply to a burning log, if all that remains of it is ash?

The masses of the gases and water vapor released into the air by the combustion reaction plus the mass of ash equal the mass of the log before burning.