1. CCA #2 Review
Choose the correct answer and be able to explain why it is correct. Use the hyperlink to see the answers when you are done.

2. What form of energy do these items use?
Mechanical
Electrical
Light
Sound

3. What form of energy do these items use?
Mechanical
Electrical
Light
Sound
These devices are both powered by light. The solar panels convert the light into electricity.

4. Which samples will boil at 100* Celsius?
W & Y
X only
X, Y, Z
All

5. Which samples will boil at 100* Celsius?
W & Y
X only
X, Y, Z
All
Water will always boil at 100*C. It doesn’t matter how much water you have, the boiling point is constant.

6. Add water Use a magnet Use a sieve Add heat
Wood chips and pieces of glass are mixed in a bowl. Which is the best separation method?
Add water
Use a magnet
Use a sieve
Add heat

7. Add water Use a magnet Use a sieve Add heat
Wood chips and pieces of glass are mixed in a bowl. Which is the best separation method?
Add water
Use a magnet
Use a sieve
Add heat
Wood chips are less dense than water and glass is more dense. Using water would cause the wood to float and the glass to sink making it easy to separate.

8. Tweezers Magnet Water Strainer
I have a mixture of sand and iron filings. Which would be the best way to separate them?
Tweezers
Magnet
Water
Strainer

9. Tweezers Magnet Water Strainer
I have a mixture of sand and iron filings. Which would be the best way to separate them?
Tweezers
Magnet
Water
Strainer
The sizes and shapes are too small to use a strainer or tweezers. Both are more dense than water and neither is soluble. Iron is magnetic and would separate the items easily.

10. Which part of the bicycle is NOT an example of mechanical energy?
Wheels
Pedals
Gears
Reflector

11. Which part of the bicycle is NOT an example of mechanical energy?
Wheels
Pedals
Gears
Reflector
Wheels, pedals and gears are all moving parts. The reflector does not move. Mechanical energy is about moving parts.

12. Which substances are more dense than water?
A student mixes 4 different substances in 100 ml of water each. What might the student be testing?
Which substances are more dense than water?
How much water is needed to make a substance change state?
What causes a substance to dissolve?
Which substance are solids and which are liquids?

13. A student mixes 4 different substances in 100 ml of water each
A student mixes 4 different substances in 100 ml of water each. What might the student be testing?
Which substances are more dense than water?
How much water is needed to make a substance change state?
What causes a substance to dissolve?
Which substance are solids and which are liquids?
The variable (the thing the scientist changed) is the different substances. The variable is the subject of the experiment – the main idea. We don’t know what the substances are, so putting them in water would show if they sink or float = density.

14. Which two forms of energy are causing a change in state of the candle.
Electrical & light
Electrical & thermal
Sound & thermal
Solid & liquid

15. Which two forms of energy are causing a change in state of the candle.
Electrical & light
Electrical & thermal
Sound & thermal
Solid & liquid
The hair dryer uses electricity to produce thermal energy which changes the state of the candle.

16. texture taste Color Physical state
If I add salt to my soup, which property of the salt will remain the same?
texture
taste
Color
Physical state

17. texture taste Color Physical state
If I add salt to my soup, which property of the salt will remain the same?
Salt is soluble so most of its physical properties change when it dissolves and spreads out in the soup. Taste is still the same.
texture
taste
Color
Physical state

18. What happens to a Kool-Aid solution if I add more water?
The color gets lighter.
The taste gets stronger
The solution gets evaporated
None of the above

19. What happens to a Kool-Aid solution if I add more water?
The color gets lighter.
The taste gets stronger
The solution gets evaporated
None of the above
More water will dilute the solution.

20. Thermal Sound Mechanical Electrical
When I strum an acoustic guitar what is the source of the energy being produced?
Thermal
Sound
Mechanical
Electrical

21. Thermal Sound Mechanical Electrical
When I strum an acoustic guitar what is the source of the energy being produced?
Thermal
Sound
Mechanical
Electrical
Source is the beginning. Sound is produced by the mechanical energy of the strumming.

22. Light and sound Mechanical and light Mechanical and sound
Dolphins have the ability to send echoes out into the ocean to find prey and avoid danger. When a dolphin is swimming and hunting, which two types of energy is it using?
Light and sound
Mechanical and light
Mechanical and sound
Light and Mechanical

23. Light and sound Mechanical and light Mechanical and sound
Dolphins have the ability to send echoes out into the ocean to find prey and avoid danger. When a dolphin is swimming and hunting, which two types of energy is it using?
Swimming requires movement – mechanical. Echoes require sound.
Light and sound
Mechanical and light
Mechanical and sound
Light and Mechanical

24. One day in February, I walked outside and noticed that the water in the dog’s bowl was solid. What is the best estimate of the temperature outside at that time?
10* C
100* C
0* C
25*C

25. One day in February, I walked outside and noticed that the water in the dog’s bowl was solid. What is the best estimate of the temperature outside at that time?
Water freezes at 0* C.
10* C
100* C
0* C
25*C

26. Sound Light Electrical Mechanical
If this hose is sprayed at the pinwheel, the flowing water would make the wheel spin. What type of energy is being demonstrated?
Sound
Light
Electrical
Mechanical

27. Sound Light Electrical Mechanical
If this hose is sprayed at the pinwheel, the flowing water would make the wheel spin. What type of energy is being demonstrated?
Sound
Light
Electrical
Mechanical
The water is causing movement of the wheel.

28. They are all less dense than water They are all soluble
Which statement is true about a mixture that is made up of iron nails, plastic rings and wooden beads?
They are all magnetic
They are all less dense than water
They are all soluble
They are all solids

29. They are all less dense than water They are all soluble
Which statement is true about a mixture that is made up of iron nails, plastic rings and wooden beads?
Only the iron
They are all magnetic
They are all less dense than water
They are all soluble
They are all solids
Only the wooden beads and the plastic rings
None of them.