7.6 Matter and Chemical Changes Quiz

Compare and contrast elements and compounds. Which of the following statements is true?

• Elements are made of molecules, while compounds are made of atoms.

• Elements are made of atoms, while compounds are made of molecules.

• Both elements and compounds are made of molecules.

• Both elements and compounds are made of atoms.

Tags

TEKS.SCI.7.6A

Which of the following is a chemical formula for a compound?

• O

• H2O

• N

• He

Tags

TEKS.SCI.7.6A

Using the periodic table, identify the number of hydrogen atoms in the chemical formula C6H12O6.

• 6

• 12

• 18

• 24

Tags

TEKS.SCI.7.6B

Which of the following best describes a physical change?

• Burning wood

• Rusting iron

• Melting ice

• Baking a cake

Tags

TEKS.SCI.7.6C

What happens to the solute concentration when more solute is added to a solution without changing the solvent amount?

• The concentration decreases.

• The concentration remains the same.

• The concentration increases.

• The concentration becomes zero.

Tags

TEKS.SCI.7.6D

Which factor does NOT affect the rate of dissolution of a solid solute in an aqueous solution?

• Temperature

• Surface area

• Agitation

• Color of the solute

Tags

TEKS.SCI.7.6E

Explain how increasing the surface area of a solute affects its rate of dissolution in a solvent.

• It decreases the rate of dissolution.

• It has no effect on the rate of dissolution.

• It increases the rate of dissolution.

• It changes the solute into a different substance.

Tags

TEKS.SCI.7.6E

Which of the following is an example of a chemical change?

• Dissolving sugar in water

• Freezing water into ice

• Burning a candle

• Cutting paper

Tags

TEKS.SCI.7.6C

How does temperature affect the rate of dissolution of a solid solute in an aqueous solution?

• Higher temperatures decrease the rate of dissolution.

• Higher temperatures increase the rate of dissolution.

• Temperature has no effect on the rate of dissolution.

• Lower temperatures increase the rate of dissolution.

Tags

TEKS.SCI.7.6E

Which of the following chemical formulas represents a compound?

• Na

• Cl

• NaCl

• O2

Tags

TEKS.SCI.7.6A