Matter Review

Which option below is a mixture?

• CO2 (s)

• CH4 (l)

• CO2 (g)

• CH4 (aq)

Which samples are substances? (There are TWO correct answers)

• HCl (aq)

• HCl (g)

• NaCl (aq)

• NaCl (s)

Which of the following statements describes a characteristic of ALL compounds?

• Compounds contain one element, only.

• Compounds contain two elements, only.

• Compounds can be decomposed by chemical means.

• Compounds can be decomposed by physical means.

Which of the following CANNOT be decomposed into simpler substances?

• AlBr3

• CO2

• Hg

• H2O

Which best describes the composition of the sample?

• A mixture of elements

• A mixture of compounds

• A mixture of elements and compounds

• A single compound

An example of a physical property of an element is the element's ability to

• React with an acid

• React with oxygen

• Form a compound with chlorine

• Form an aqueous solution

Which process represents a chemical change?

• melting of ice

• corrosion of copper

• evaporating water

• crystallization of sugar

Which statement describes a chemical property of the element magnesium?

• Magnesium is malleable

• Magnesium conducts electricity.

• Magnesium reacts with an acid.

• Magnesium has a high boiling point.

Which is an example of a physical change?

• Hydrogen gas burning in air

• Water evaporating from a lake

• elephant toothpaste bubbling when mixed

• Eggs rotting produces a strong odor

ALL phase changes are....

• Physical

• Chemical