3.5C - A student makes a model of the water cycle by using a cup, some water, and plastic wrap. After the student places the model near a sunny window, moisture forms on the inside of the plastic wrap.

• Freezing
• Condensation
• The warming of air
• The formation of clouds

5.5A - A teacher mixes a white powder into a beaker of water. The powder cannot be seen in the water. The teacher then heats the mixture until the water evaporates and the powder can be seen again. Which property of the powder is the teacher demonstrating?

• Soluability
• Density
• Conductivity
• Mass

5.5A - 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

5.5A: Molecules in a solid object are...

• spread far apart
• very close together
• flowing around and near each other

5.5A - A student reads the label on the bottle of salad dressing shown below. Why would the student shake the salad dressing well before using it?

• Vinegar and oil have different densities.
• Vinegar and oil easily form a solution
• Vinegar and oil both contain water
• Vinegar and oil are both liquids

5.5A - All of the following materials are conductors except-

• Iron Nail
• Metal spoon
• cotton ball
• copper wire

5.5A - This is a picture of oil and water.  Why does the oil float on top of the water?

• The water is less dense than the oil so it floats on top of the oil.
• The oil is less dense than the water so it floats on top of the water.
• The oil is more dense than the water so it sinks.
• The oil is less dense than the water so it sinks.

5.5B - A student measures the temperature of water being heated on a hot plate. The student observes that the temperature of the water is 53°C. How many more degrees Celsius must the temperature rise before it reaches the boiling temperature of water?

• 37°C
• 47°C
• 57°C
• 67°C

5.5B -  What happens to water when it reaches its melting point?

• it shrinks
• it freezes to ice
• changes states (liquid water turns into solid ice)
• changes states (solid ice turns into liquid water)

5.5C - A mixture of beads was placed in a container, as shown below. The beads are of various sizes, and each one is made of plastic,glass, or steel. The mixture would be easy to separate because all the beads —

• are less dense than water
• are solids
• have the same mass
• are attracted to a magnet