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Physical And Chmical Change Review #2
Test Description: NA
Instructions: Answer all questions to get your test result.
1) A balloon is placed in a freezer and left overnight. Which would be evidence that a physical change occurred when the freezer was opened the next day? The balloon
A
has shrunk in size
B
cannot return to it’s original shape
C
is giving off a new gas
D
cannot be found
2) An iron nail left outdoors for a year undergoes a chemical change. What evidence would visible? The nail would be
A
rusty
B
buried in soil
C
sharper
D
bent
3) What hazards exist when mixing unknown chemicals?
A
A physical change may make them less useful
B
A chemical change may alter the colors.
C
A chemical change may create heat and expansion.
D
A physical change may make them change phase
4) . A student puts out fire on the stove by dumping baking soda on the flame. How has the student used scientific knowledge in his daily life?
A
He knew a chemical property of baking soda is that it dissolves in water
B
He knew a chemical property of baking soda is that it doesn’t burn
C
He knew a physical property of baking soda is that it is white in color
D
He knew a physical property of baking soda is that it doesn’t melt
5) How do you know when a chemical reaction has occurred?
A
a new substance has formed; it would be hard to reverse
B
the substance changes size, shape, texture and mass
C
the mass of the reactants is changed into energy that is given off
D
a phase change has occurred and heat was given off.
6) Scientists have developed special paints for the undersides of ships at sea. What problem are they trying to correct?
A
flexibility of steel beams
B
rusting of metal parts
C
melting of ship engines
D
dissolving of plastic parts
7) Charles Goodyear accidentally spilled sulfur on latex rubber and discovered a way to make the rubber more elastic. What does his discovery show about science?
A
physical changes are random and unpredictable
B
chemical changes use the same set of steps and procedures
C
scientific discoveries are made in many ways.
D
scientific discoveries are made following specific steps.
8) A chemical change occurs when an egg cooks. What effect does the chemical change have on the physical properties of the egg?
A
the egg cannot be measured
B
the egg is unchanged.
C
the egg has new physical properties
D
the egg has doubled in size.
9) An iron nail rusts when left outdoors. Why might the nail no longer be useful?
A
it is now made of a softer substance
B
it has become wet and dry several times
C
it has turned orange and red
D
it is not long and skinny any more.
10) Which of the following is true of chemical properties? They
A
describe the phase the substance is in
B
explain how the substance reacts with other substances
C
are measurements of the size or mass of the substance
D
predict how much of the substance is found in the universe.
*select an answer for all questions
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