Science CBA #2 Review

_{^{Students perform an experiment and record their observations. The results are shown in the chart. What are the students most likely observing?}}

• Sinking and floating objects
• Objects that are not magnetic
• Solids, Liquids and Gases
• Objects with the greatest density

Which of these is the best insulator of electricity?

• Copper penny
• Plastic tubing
• Aluminum foil
• Metal washer

All matter can be classified by their physical properties. Which substance can be classified as being soluble in water?

• Sand
• Pepper
• Iron fillings
• salt

Students sort materials into two groups. Group 1 contains a metal fork, a safety pin, and metal nail clippers. Group 2 contains a penny, a compact disc, and a soda can.
Which physical property of matter did the class use to sort the materials?

• Sinking and floating
• Magnetic and not magnetic
• Conductors and insulators
• Solids and liquids

Which object would be the least dense in a tub of water?

• Golf ball
• Glass marble
• Rubber ball
• Beach ball

At what temperature does ice begin to melt?

• 100 degrees C
• 0 degrees C
• 100 degrees F
• 32 degrees C

What is most likely observed when the temperature of water increases and reaches 100°C?

• The water begins to harden.
• The Water begins to form water vapor.
• The water level begins to increase.
• The water begins to melt.

Which answer choice is only a mixture?

• Sand and water
• Salt and vinegar
• Sugar and water
• Lemon juice and water

When combined, which ingredients will maintain their physical property of being a solid?

• Sugar cube and water
• Wood chips and clay
• Syrup and vinegar
• Oil and water

One way to separate a solution is through evaporation. What is necessary for evaporation to occur?

• Energy
• Freezing
• Condensation
• Melting