Midterm Review-2014-15 Question Preview (ID: 22984)


8th Grade. TEACHERS: click here for quick copy question ID numbers.

Explain how compounds form.
a) A. chemical bonds form between atoms
b) B. elements dissolve in water
c)
d)

If there are 10 grams of Ag (silver) and 20 grams of O (oxygen), what will be the mass of Silver oxide?
a) A. 10 grams
b) B. 30 grams
c)
d)

What will the properties of the new AgO be like?
a) A. The elements reacted chemically to form an element with new properties.
b) B. The elements reacted chemically to form a compound with new properties.
c)
d)

Cellulose is a compound made of the elements carbon, hydrogen, and oxygen. Describe the physical and chemical properties of cellulose.
a) The physical properties of the elements and cellulose are different,but their chemical properties are the same.
b) The physical and chemical properties of the elements are different from the physical and chemical properties of cellulose.
c)
d)

What can you say about the number of atoms of water in a covered pot before and after it was boiled?
a) A. The number of atoms in the water remains constant.
b) B. The temperature of the water remains constant.
c)
d)

Explain how changes in temperature affects states of matter and motion of molecules.
a) A. Molecules in a liquid have more energy than the molecules in a solid and move faster.
b) B. Molecules in a gas are close together and hardly move.
c)
d)

Convection transfers heat in
a) currents
b) waves
c)
d)

Describe the properties of an acid.
a) A. Sour; pH=3,
b) B. Bitter: pH 10
c)
d)

What steps do scientists take in order to remain objective when designing investigations and examining data?
a) The scientists should analyze all results before arriving at their conclusion.
b) The scientists should change their hypothesis to match their data.
c)
d)

Describe the properties of a chemical reaction.
a) Change in shape
b) Change in color
c)
d)

What force causes objects that are at rest to move?
a) A. the force acting on an object must be balanced.
b) B. the force acting on an object must be unbalanced.
c)
d)

Explain why moving objects will stay in motion at the same speed and in the same direction.
a) A. Moving objects will stay in motion at the same speed and in the same direction unless acted on by an unbalanced force.
b) B. Moving objects will stay in motion at the same speed and in the same direction unless acted on by an balanced force.
c)
d)

Give reasons for the importance of waiting until an investigation has been repeated many times before accepting the results as correct.
a) A. to reduce the likelihood of a design defect
b) B. to reduce the likelihood of inaccurate results
c)
d)

As mass increases, distance...
a) A. As the mass of the object increases, the distance traveled increases.
b) B. As the mass of the object increases, the distance traveled decreases.
c)
d)

Describe examples of heat being transferred through conduction.
a) a burner warming a pan
b) a microwave warming food
c)
d)

What are the three forms of energy that are transformed in the flashlight?
a) A. chemical → electrical → light
b) B. mechanical → heat → chemical
c)
d)

At which location on a mountain does a car have the greatest potential energy?
a) A. At the top of the hill
b) B. At the bottom of the hill
c)
d)

Why are hypotheses helpful even when they are wrong?
a) The hypothesis matches the problem.
b) It still is valuable because the data may lead to other important investigations.
c)
d)

After you apply force to a doorbell, your hand moves
a) in the same direction as the doorbell at a constant speed
b) in the opposite direction as the doorbell at a constant speed
c)
d)

Radiation transfers heat from one object to another without matter between them. An example would be
a) The sun warming the air around the earth
b) Hot cup of coffee warming your hands.
c)
d)

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