Understanding Matter and Solutions

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.

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

• Melting ice

• Dissolving sugar in water

• Burning wood

• Breaking a glass

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In an aqueous solution, what is the role of the solvent?

• It is the substance being dissolved.

• It is the substance that dissolves the solute.

• It is the solid part of the solution.

• It is the gaseous part of the solution.

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

Which of the following chemical formulas represents a compound?

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

• Rusting of iron

• Baking a cake

• Freezing water

• Digesting food

What happens to the concentration of a solution when more solute is added?

• The concentration decreases.

• The concentration increases.

• The concentration remains the same.

• The concentration becomes zero.

Which of the following will increase the rate of dissolution of sugar in water?

• Decreasing the temperature

• Increasing the surface area of sugar

• Using larger sugar crystals

• Keeping the solution still