Physical And Chmical Change Review #2: Question Preview (ID: 32757)


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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) cannot return to it’s original shape b) has shrunk in size c) cannot be found d) is giving off a new gas
An iron nail left outdoors for a year undergoes a chemical change. What evidence would visible? The nail would be
a) bent b) rusty c) buried in soil d) sharper
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.
. 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 physical property of baking soda is that it doesn’t melt b) He knew a chemical property of baking soda is that it doesn’t burn c) He knew a chemical property of baking soda is that it dissolves in water d) He knew a physical property of baking soda is that it is white in color
How do you know when a chemical reaction has occurred?
a) a new substance has formed; it would be hard to reverse b) a phase change has occurred and heat was given off. c) the substance changes size, shape, texture and mass d) the mass of the reactants is changed into energy that is given off
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
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 in many ways. b) chemical changes use the same set of steps and procedures c) physical changes are random and unpredictable d) scientific discoveries are made following specific steps.
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 is unchanged. b) the egg has new physical properties c) the egg cannot be measured d) the egg has doubled in size.
An iron nail rusts when left outdoors. Why might the nail no longer be useful?
a) it has turned orange and red b) it has become wet and dry several times c) it is now made of a softer substance d) it is not long and skinny any more.
Which of the following is true of chemical properties? They
a) describe the phase the substance is in b) are measurements of the size or mass of the substance c) explain how the substance reacts with other substances d) predict how much of the substance is found in the universe.
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