Standard 1-2 Part 2 Question Preview (ID: 2509)
Chemical And Physical Changes.
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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) Place 25 grams of salt into 100 mL of water.
b) The molecules of salt are moving around in the water.
c) If stirred or heated, then salt will dissolve in water more quickly.
d) Salt dissolves in water because water has moving molecules.
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) Salt will dissolve more quickly if it is stirred than if it is heated or left alone.
b) Salt will dissolve in water when the moving molecules of water take it apart.
c) Heating and stirring are equally important if you want to dissolve salt.
d) Salt will dissolve in water if left alone.
How does a burning fire consume atmospheric oxygen differently than a nail rusting?
a) Rusting requires a special form of oxygen
b) Rusting is a chemical change, fire is not
c) A fire does not need as much oxygen as rusting
d) A fire uses oxygen much more rapidly
An iron nail left outdoors for a year undergoes a chemical change. What evidence would visible? The nail would be
a) bent
b) sharper
c) buried in soil
d) rusty
What is the main difference between fire and respiration?
a) how quickly they happen
b) they are identical
c) the fuels that are burned
d) the products
How is rust different from the other three reactions?
a) It happens in the out-of-doors.
b) It uses water.
c) It cannot be measured
d) It involves metals.
An iron nail rusts when left outdoors. Why might the nail no longer be useful?
a) it has become wet and dry several times
b) it is not long and skinny any more.
c) it is now made of a softer substance
d) it has turned orange and red
Color change is evidence that a chemical change may have occurred.
a) True
b)
c)
d) False
Chemical changes can be reversed by physical changes.
a) True
b)
c)
d) False
A _____________________ change is a change of matter from one form to another without a change in chemical properties.
a) Physical
b)
c)
d) Chemical
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