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Standard 1-2 Part 1
Test Description: Chemical and physical changes
Instructions: Answer all questions to get your test result.
1) An ice cube is left on a table for an hour. What evidence shows a physical change takes place?
A
It bubbles and gives off gas
B
It gives off carbon dioxide
C
It turns into a different substance
D
It melts into water
2) 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.
3) 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
dissolving of plastic parts
C
rusting of metal parts
D
melting of ship engines
4) Salt is mixed with water and stirred. Is this a physical or chemical change? Why?
A
It is physical because the salt has turned into a gas.
B
It is physical because it is easily reversible.
C
It is chemical because a gas, water vapor, is given off.
D
It is chemical because a new substance, saltwater, has been formed
5) 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.
6) Two students mix vinegar and baking soda. They observe bubbles forming, the baking soda dissolving, and the vinegar turning cloudy. They infer that a chemical change has occurred. Which data support this inference?
A
bubbles formed
B
baking soda dissolved
C
vinegar evaporated
D
light was given off
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
scientific discoveries are made following specific steps.
B
physical changes are random and unpredictable
C
chemical changes use the same set of steps and procedures
D
scientific discoveries are made in many ways.
8) 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 be found
C
cannot return to it’s original shape
D
is giving off a new gas
9) What hazards exist when mixing unknown chemicals?
A
A physical change may make them less useful
B
A physical change may make them change phase.
C
A chemical change may create heat and expansion
D
A chemical change may alter the colors.
10) Is burning wood a chemical or a physical change?
A
Chemical change
B
Physical Change
*select an answer for all questions
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