Test Review Gas+Solutions

A mixture that appears to have the same composition, color, and density and is mixed at the molecular level is called a(n) ___.

• solution
• heterogeneous mixture
• suspension
• element

Which of the following is a solution?

• salt water
• Oil + water
• Breakfast cereal + Milk
• chlorine

A ___ is the substance being dissolved in a solution.

• solvent
• insolvent
• substrate
• solute

Air contains 78% nitrogen, 21% oxygen, and 1% argon. Which gas is the solvent?

• oxygen
• argon
• nitrogen
• none of the above

Sterling silver contains 92.5% silver and 7.5% copper. Which substance is the solute?

• silver
• copper
• platinum
• Solids do not form solutions

Which attribute enables water molecules to dissolve sugar?

• liquid state of the solute
• stationary nature of water molecules
• nonpolarity of water
• electrical charge/ polarity

Which of the following actions increases the rate of dissolving?

• decreasing the temperature
• using larger-sized crystals
• decreasing the pressure
• stirring the solution

As the temperature of a liquid solvent increases. the amount of solute that can dissolve in it ___.

• decreases
• remains constant
• increases
• decreases by 1 degree Celsius for every milliliter of solvent

What causes soda to bubble over upon opening?

• The pressure of the carbon dioxide in the bottle increases.
• The carbon dioxide is more soluble.
• The temperature inside the bottle is low.
• Gas bubbles are exposed to the surface and come out of solution.

Gases are ___ in cooler solvents.

• less soluble
• insoluble
• precipitates
• more soluble