1. Which Ear Structure is most like the Eye’s optic nerve?

  1. Middle Ear Bones because it vibrates
  2. Auditory Nerve because it sends the electrical signal to the brain
  3. Ear Drum because it wobbles with the sound wave
  4. Cochlea because it converts sound energy into electrical energy
  1. Which is the correct order of structures encountered by a sound wave traveling through the ear? (Not all structures are stated in the answer)
  2. Cochlea, Eardrum, Pathway to the Brainc. c. Pathway to the Brain, Cochlea, Eardrum
  3. Eardrum, Cochlea, Pathway to the Braind. d. Pathway to the Brain, Eardrum, Cochlea

3. Sound travels slowest through:

  1. Liquids because the molecules move the easiest
  2. Gases because the molecules are far apart
  3. Solids because the molecules are closest together
  4. Gases because the molecules are closest together

4. A string vibrates with a very low frequency, therefore it sounds

  1. Very Loudc. High Pitch
  2. Very Quietd. Low Pitch

5. The diagram below shows milk being poured into a measuring cup.

6.

Which observation would be evidence that the water is undergoing a phase change?

  1. Waves form on the top of the pond.
  2. Water soaks into the wet sand.
  3. The water splashes out of the swimming pool.
  4. The water level in the glass of water decreases.

8. Which process is an example of a physical change?

a. wood burning c. ice melting

b. iron rusting d. milk souring

9. You make a solution of salt, water, sugar, and instant coffee.

Which of these is the solvent?Which of these is the solute?

10. Which states of matter are present in this sealed container?

11. The melting point of a solid is 24.90C. As heat is added to melt the solid, what happens to the particles?

a. The motion of the particles increases. c. The particles move farther apart.

b. The motion of particles decreases. d. The particles move closer together.

12.An example of a property of matter that can be observed without changing the identity of the matter is:

a. flammability c. solubility

b. reactivity d. ability to rust

13. A class observes two demonstrations: water changing into steam and a piece of wood burning and producing smoke. A student concludes that both demonstrations must be examples of a chemical change because a gas is produced in each.

Is the student's conclusion accurate? Explain your answer, referring to both demonstrations.

14. Which best describes why metals are used for making pots and pans that are used for cooking?

a. Metals conduct heat and have a high melting point. c. Metals radiate heat and have a high melting point.

b. Metals conduct heat and have a low melting point.d. Metals radiate heat and have a low melting point.

  1. There is a large metal bridge in Charlotte. During the winter season, the bridge gets slightly shorter in length. Which of the following best explains this phenomenon?
  2. The molecules contract because they lose energy
  3. The molecules lose energy, move slower, and come close together
  4. The molecules expand, gain energy, and move faster
  5. The molecules gain energy, move faster, and spread apart
  1. Your car has been sitting in the sun all day long. The sun is heating the car, and the hot air inside the car is warming up the metal seat belt. When you grab the seat belt, it burns your hand and you scream. Describe the 3 types of thermal energy transfers that have occurred.

17. The water is 25°C and the magnet is 55°C. Answer the following questions.

a. What direction will energy move?

b. How will the temperatures of the water and magnet change?

c.. When will energy stop moving and how will you know?

18. Your friend’s chair has been sitting outside on a hot sunny day. The sun heats the chair. When your friend sits on the chair, it warms their legs. What is the sequence of thermal energy transfers?

19. You buy French fries at McDonald’s. The server places the French fries in a paper bag. As your walk back to the car the fries begin to cool down. Why? What will happen to the temperature of the fries over time? (These words must be part of your answer: transfer, equilibrium)

20. An experiment was performed to determine how the amount of coffee grounds used could affect the taste of coffee. The same kind of coffee, the same coffee pot, the same amount and type of water, the same brewing time, and the same electrical source were used.

What is the experimental question? What is the IV? What is the DV? What are the constants?

21.

22. You want to make mashed potatoes. The stove heats the pot of water. The boiling water cooks your potatoes. What is the sequence of thermal energy transfers?

24. Explain why marshmallows melt in hot chocolate.

25. Complete the chart Chemical versus Physical Properties; choose whether the property is chemical or physical with an X in the correct column

Property Description / Chemical / Physical
The ability to evaporate / X
Density
Luster (shininess)
Can react with an acid
Combustible
Malleability
Color
Odor
The ability to rust

26. Two examples of a chemical change:

27. Two examples of a physical change:

28.The spaghetti sauce jar has been in the refrigerator for a week. You want to make pasta for lunch, but you are having difficulty unscrewing the top off the jar. Why?

You run the jar under hot water and it opens easily. Why?

  1. What do molecules do when they are heated?
  1. The molecules contract because they are losing energy
  2. The molecules expand because they are gaining energy
  3. The molecules will move slower and get closer together because they are losing energy.
  4. The molecules will move faster and spread out because they are gaining energy.
  1. What would happen to anyobject if the temperature decreases from 99ºF to 22ºF?