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Standard 1-2 Part 2
Test Description: Chemical and physical changes
Instructions: Answer all questions to get your test result.
1) An experiment with rock salt used three beakers. Each had 100 ml of water and 25 g of salt added. Beaker A was left alone and Beaker B and C were changed. The time needed to dissolve the salt was measured. Which of the following is the best hypo
A
The molecules of salt are moving around in the water.
B
Place 25 grams of salt into 100 mL of water.
C
Salt dissolves in water because water has moving molecules.
D
If stirred or heated, then salt will dissolve in water more quickly.
2) An experiment with rock salt used three beakers. Each had 100 ml of water and 25 g of salt added. Beaker A was left alone and Beaker B and C were changed. The time needed to dissolve the salt was measured. Which conclusion best sums up this expe
A
Heating and stirring are equally important if you want to dissolve salt.
B
Salt will dissolve in water if left alone.
C
Salt will dissolve more quickly if it is stirred than if it is heated or left alone.
D
Salt will dissolve in water when the moving molecules of water take it apart.
3) How does a burning fire consume atmospheric oxygen differently than a nail rusting?
A
Rusting is a chemical change, fire is not
B
A fire uses oxygen much more rapidly
C
Rusting requires a special form of oxygen
D
A fire does not need as much oxygen as rusting
4) 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
sharper
D
buried in soil
5) What is the main difference between fire and respiration?
A
they are identical
B
the fuels that are burned
C
the products
D
how quickly they happen
6) How is rust different from the other three reactions?
A
It cannot be measured
B
It uses water.
C
It happens in the out-of-doors.
D
It involves metals.
7) 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 turned orange and red
C
it has become wet and dry several times
D
it is not long and skinny any more.
8) Color change is evidence that a chemical change may have occurred.
A
False
B
True
9) Chemical changes can be reversed by physical changes.
A
True
B
False
10) A _____________________ change is a change of matter from one form to another without a change in chemical properties.
A
Chemical
B
Physical
*select an answer for all questions
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