Review 3

A teacher wears protective gloves to lift a metal pan filled with boiling water from a hot plate. Why are the protective gloves necessary?

• The metal pan creates thermal energy.

• the metal pan insulates thermal energy.

• The metal pan conducts thermal energy.

• The metal pan reduces thermal energy.

What are the three states of matter?

• solid, volume, mass
• density, volume, mass
• solid, liquid, gas
• density, gas, volume

If purple drink mix is added to water, what change will occur to the water?

• The drink mix will cause the water to freeze

• The water will totally disappear

• The drink mix will heat the water

• The water will change color

What describes the ability of a solid to dissolve in water?

• melt
• dissapear
• solubility
• evaporate

Which type of objects would float?

• Those heavier than water
• Those with the same density as water
• Those less dense than water
• Those that are only made of gas

Which process will separate the sugar from mixture of sugar and water?

• Stirring the mixture

• Evaporating the water

• Adding more water

• Adding more sugar

In an activity, 20 grams of salt are dissolved in 70 grams of pure water. The water is then heated on a hot plate. When the water evaporates completely, how much salt will be left?

• 0 grams

• 18 grams

• 20 grams

• 22 grams

Which of the following is a good conductor of electricity?

• glass rod

• cotton string

• plastic tubing

• copper penny

A student has puts 4 objects in a bucket filled with water. The objects are listed above. Which two objects are most likely less dense than water?

• Wood block and metal paper clip

• plastic ball and glass marble

• metal paper clip and glass marble

• wood block and plastic ball

Which of these is NOT soluble in water?

• oil

• salt

• honey

• sugar