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

• melt
• dissapear
• solubility
• evaporate

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

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

What is the BEST tool to separate gravel from sand?

• use a magnet

• use tweezers

• pour the mixture through filter paper

• use a strainer or sieve

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.

Which state of matter has particles that are tightly packed?

• liquid
• gas
• solid

In order to find out which towel brand holds the most water, we should do an ____________________.

• hypothesis

• investigation

• science project

• conclusion

Which of these is the best conductor of electricity? (5.5A)

• Glass rod

• Cotton string

• Plastic tubing

• Copper penny

A teacher sets up an experiment using five jars. The teacher keeps one jar unwrapped, and the other four jars are wrapped with equal thicknesses of four different materials. Which property of the materials wrapping the jars are the students most likely investigating? (5.5A)

• State of matter

• Thermal energy insulation

• Thermal energy production

• Ability to conduct electricity

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

• 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.