Chemistry Matters!

Which formula represents a mixture?

• C₆H₁₂O₆(l)

• C₆H₁₂O₆(s)

• LiCl(aq)

• LiCl(s)

Bronze contains 90 to 95 percent copper and 5 to 10 percent tin. Because these percentages can vary, bronze is classified as

• a compound

• an element

• a mixture

• a substance

Which diagram or diagrams represent a mixture of elements A and B?

• X, only

• Z, only

• X and Y

• X and Z

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

• element

• mixture

• compound

• solution

Which material is a mixture?

• water

• air

• methane

• magnesium

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

The arrangement of particles is most ordered in a sample of

• NaCl(aq)

• NaCl(l)

• NaCl(g)

• NaCl(s)

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The joule is a unit of

• concentration

• energy

• pressure

• volume

At STP, which physical property of aluminum always remains the same from sample to sample

• mass

• density

• length

• volume