Matter (20q)

Any substance composed of two or more elements that are chemically combined in a fixed proportion is

• an isomer

• an isotope

• a solution

• a compound

Which of these terms refers to matter that could be heterogeneous?

• element

• mixture

• compound

• solution

When KCl(s) is dissolved in water, the resulting solution is classified as a

• heterogeneous compound

• homogeneous compound

• heterogeneous mixture

• homogeneous mixture

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When sample X is passed through a filter paper a white residue, Y, remains on the paper and a clear liquid, Z, passes through. When liquid Z is vaporized, another white residue remains. Sample X is best classified as

• an element

• a compound

• a heterogenous mixture

• a homogenous mixture

Which of the following is a homogenous mixture?

• CO_{2 (g)}

• NaCl_(l)

• CO₂ (s)

• NaCl (aq)

Which of these contains only one substance?

• distilled water

• sugar water

• saltwater

• rainwater

Which of these terms refers to matter that could be heterogeneous?

• A compound

• A mixture

• An element

• A solution

Which statement is an identifying characteristic of a mixture?

• A mixture can consist of a single element.

• A mixture can be separated by physical means.

• A mixture must have a definite composition by weight.

• A mixture must be homogeneous.

Table sugar can be separated from a mixture of table sugar and sand at STP by adding

• sand, stirring, and distilling at 100.°C

• sand, stirring, and filtering

• water, stirring, and distilling at 100.°C

• water, stirring, and filtering