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Unit 5 Alaska Quiz (Chemical Changes; Oil, Pulleys, Ramps)
供稿人: Raiten
The brick is pulled up an inclined plane.
At what point does the brick have the greates amount of 
potential energy
at the top of  the inclined plane
at the bottom of the inclined plane
at the center of the inclined plane
it doesn't have potential energy

A

B

D

6.7a Oil
It produces carbon dioxide emissions
It must be extracted out of the ground
It is easily transported worldwide
Crude oil spills happen on land and water
What is the advantage to using a longer inclined plane?

it takes as longer time to push the object up

there is no advantage

It takes more force to push the object up

It takes less force to push the object up

6.9C
Which system shows a transformation from
chemical to electrical to light energy?
Sun shining on a photovoltaic roof panel
Coal burning in a power plant causes lights to light up a room
A display of fireworks in the night sky
An avalanche rolls down a steep mountain
6.5dDuring a science class experiment, a teacher placed a small amount of baking soda into 100 mL of vinegar.Which of the following would be the best evidencethat a chemical change has taken place?
The liquid is colorless
baking soda doesn't dissolve
A gas is given off
The baking soda dissolves
bicyclist R
bicyclist S
bicyclist T
bicyclist U
6.8d
Based on the
graph which
bicyclist
traveled
at a constant
speed the
entire time?

Which statement is true about using shorter, steeper inclined planes to lift an object?

fewer lifters are needed and it will take more time
More lifters are needed, and it will take less time.
fewer lifters are needed and it will take less time
Which pulley system requires the least amount
of effort to lift the load?
A
B
C
D

A

B

C

D

Photosynthesis is an example of

chemical change

 none of the above

physical change

Cutting a log into pieces is  an example

of a chemical change.

True

False 

neither

Burning coal is an example of

both

chemical change

none of the above

physical change

Which inclined plane would give the user
the best advantage by requiring the least 
effort/force when moving the object?
B
A
C
D

Evidence of a chemical change

when buring thermite is

production of a gas

a flame is visible and produces heat

color change

all of these

When potassium chlorate is heated it turns

to a liquid.  This is an example of a

physical change

chemical change

none of the above

irreversible

Which is a physical change?

burning leaves

baking bread

chopping celery

burning coal

Which is a chemical change?

copper oxidizing and turning green

freezing fruit juice

boiling water

slicing a potato

Dissolving sugar in water is an example of

chemical change

physical  change

 a change in the state of matter

A solid that forms as a result of a

chemical reaction between two liquids is a

precipitate

solvent

solute

mineral

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