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Physical Chemical Changes Energy Transfer Digestive System
Test Description: Physical Chemical Changes Energy Transfer Digestive System
Instructions: Answer all questions to get your test result.
1) If we have any substance, it can be concluded that a chemical change has happened if–
A
there is a color change.
B
there is a decrease in mass.
C
the state of matter changes.
D
the matter is stirred thoroughly.
2) Which of the following would indicate the formation of a new substance?
A
A liquid turns to a solid.
B
A sample of metal melts.
C
Bubbles and fizzing occur.
D
A solid dissolves in a liquid.
3) Which of the following is an example of a physical change?
A
An explosion
B
A piece of paper is crumpled.
C
A solid stays a solid.
D
Two liquids are mixed and it warms up.
4) When two liquids are mixed, the container feels colder to the touch. This is evidence of what?
A
A chemical change
B
A physical change
C
No change
D
A state of matter change
5) When two liquids are mixed, the color and temperature stay the same. This is evidence of what?
A
A state of matter change
B
A physical change
C
A chemical change
D
No change
6) Which of the following is an example of chemical energy being converted into mechanical energy in the biosphere?
A
Lightning strikes dry vegetation in an open field and causes a fire
B
Animals convert the food they eat to muscle movement of muscles
C
Plants store energy collected from sunlight in sugar they produce
D
The weathering of Earth’s surface breaks down rock to make soil
7) During digestion, which of the following energy conversions occurs?
A
Chemical energy → heat energy
B
Mechanical energy → heat energy
C
Heat energy → chemical energy
D
Electrical energy → chemical energy
8) A bird that eats seeds converts the energy stored in the seeds into the energy of its flight muscles. This conversion is from what kind of energy to what other kind of energy?
A
Radiant energy → chemical energy
B
Sound energy → radiant energy
C
Chemical energy → mechanical energy
D
Mechanical energy → thermal energy
9) Green plants use sunlight to make their own food in the form of glucose. This process, known as photosynthesis, is an example of which of the following energy conversions?
A
Chemical energy → mechanical energy
B
Mechanical energy → thermal energy
C
Sound energy → radiant energy
D
Radiant energy → chemical energy
10) Thermal energy is one of the forms of energy resulting from digestion which gets energy from food in the form of –
A
light energy.
B
mechanical energy.
C
radiant energy.
D
chemical energy.
11) Site of water absorption from remaining undigested food to make feces.
A
Small Intestine
B
Large Intestine
C
Esophagus
D
Stomach
12) Muscular sac-shaped bag where acid and enzymes digest food and kill bacteria. Muscles in the walls churn (contract) to promote mechanical (physical) digestion.
A
Stomach
B
Esophagus
C
Small Intestine.
D
Mouth
13) Teeth cut and grind food into smaller peices by chewing and saliva lubricates food and adds enzymes to start chemically changing food.
A
Mouth
B
Stomach
C
Esophagus
D
Small Intestine
14) Tube connecting mouth to stomach.
A
Esophagus
B
Large Intestine
C
Small Intestine
D
Stomach
15) Long tube wehre only chemical digestion occurs. Finger-like projections called villi are found here which allow for the absorption of nutrients into the capillaries of the bloodstream to be sent to the rest of the body.
A
Mouth
B
Small Intestine
C
Stomach
D
Large Intestine
*select an answer for all questions
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