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2000
Change, Matter and Energy
1


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Questionario a risposta multipla

1. Which one of the following is not part of the scientific method?
hypothesis
principle
theory
experiment
2. A substance melts at -5?C and boils at 19?C. At room temperature, about 23?C, which of these statements must be true?
The substance is an element.
The substance has an indefinite volume.
The substance is a liquid.
The substance is a compound.
 
3. Which of the following is an incorrect chemical symbol?
potassium, K
sulfur, S
aluminium, Al
iron, FE
4. An example of an exothermic process is:
cooking potatoes.
breaking glass.
melting iron.
exploding a firecracker.
5. The state of matter characterized by a definite volume but an indefinite shape is:
gas.
liquid.
mixture.
solid.
6. Which of the following is heterogeneous?
a dollar bill.
tincture of iodine.
a gold ring.
a stick of margarine.
7. Which of the following is not a form of energy?
light.
pressure.
heat.
electricity.
8. Which of the following is not a physical change?
melting wax.
freezing alcohol.
cutting a tree limb.
souring of milk.
9. The temperature 120 K is the same as:
393?C.
-153?C.
-393?C.
153?C.
10. One hundred grams of charcoal is burned in an experiment. The ashes from this reaction weigh 12 g. This experiment appears to violate the
law of unequal weights.
law of conservation of mass.
law of chemical reactions.
law of conservation of energy.
11. Every mixture must
have a variable composition.
be homogeneous.
contain at least two compounds.
be a solution.
12. Dry ice (solid carbon dioxide) characteristically changes directly from the solid state to a vapour. This physical change is called
evaporation.
condensation.
gasification.
sublimation.
13. Which of the following is a chemical change?
melting wax.
burning a candle.
boiling water.
dissolving sugar in water.
14. Which of the following is the highest temperature?
450 K
450?C.
450?F.
All represent the same temperature.
15. A physical property of water is that
it is a liquid at room temperature.
it boils at 100?C.
it is tasteless.
all of the above.
16. Homogeneous matter that has a variable composition is called
a liquid.
an element.
a compound.
a solution.
17. Which of the following is a chemical proprerty of butter?
It has a greasy feel.
It turns rancid if left unrefrigerated.
It is light yellow in colour.
It melts at 40?C.
18. The temperature of 14?F is equivalent to the temperature
14?C
26?C
-10?C
32?C
19. Which of the following is generally not an indication of a chemical change?
Energy change.
Colour change.
Easily reversed.
Odour change.
20. When heated, a piece of wire changes from yellow-orange to black, and its mass increases. From this we can conclude that
a physical change has taken place.
mass is not conserved in this reaction.
the original wire was a compound.
the black colour is due to the formation of a new compound.

Questionario a risposta Vero/Falso

21. The symbol of every element is the first one or two letters in its English name
True
False
 
22. A compound can be chemically broken down into two or more elements.
True
False
 
23. Homogeneous mixtures have a definite composition.
True.
False
24. In every physical and chemical change both mass and energy are conserved
True
False
25. When you buy gasoline, you are buying chemical potential energy.
True
False
26. When a solution is heated, a gas is formed; therefore, a chemical reaction most certainly occured.
True.
False.
27. Pure water is both a homogeneous substance and a compound.
True.
False.
28. Theories are proven by experiments.
True.
False.
29. A match weighs less after it is burned; therefore, some of the mass of the match has been destroyed when the match burns.
True.
False.
30. A change in colour is a good indicator of chemical change.
True.
False



© Nino Vessella , 1996-.
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