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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
Salt dissolves in water because water has moving molecules.
how quickly they happen
it is now made of a softer substance
Rusting is a chemical change, fire is not
Salt will dissolve more quickly if it is stirred than if it is heated or left alone.
Physical
True
It uses water.
How does a burning fire consume atmospheric oxygen differently than a nail rusting?
Salt dissolves in water because water has moving molecules.
how quickly they happen
it is now made of a softer substance
Rusting is a chemical change, fire is not
Salt will dissolve more quickly if it is stirred than if it is heated or left alone.
Physical
True
It uses water.
An iron nail rusts when left outdoors. Why might the nail no longer be useful?
Salt dissolves in water because water has moving molecules.
how quickly they happen
it is now made of a softer substance
Rusting is a chemical change, fire is not
Salt will dissolve more quickly if it is stirred than if it is heated or left alone.
Physical
True
It uses water.
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
Salt dissolves in water because water has moving molecules.
how quickly they happen
it is now made of a softer substance
Rusting is a chemical change, fire is not
Salt will dissolve more quickly if it is stirred than if it is heated or left alone.
Physical
True
It uses water.
Color change is evidence that a chemical change may have occurred.
Salt dissolves in water because water has moving molecules.
how quickly they happen
it is now made of a softer substance
Rusting is a chemical change, fire is not
Salt will dissolve more quickly if it is stirred than if it is heated or left alone.
Physical
True
It uses water.
How is rust different from the other three reactions?
Salt dissolves in water because water has moving molecules.
how quickly they happen
it is now made of a softer substance
Rusting is a chemical change, fire is not
Salt will dissolve more quickly if it is stirred than if it is heated or left alone.
Physical
True
It uses water.
A _____________________ change is a change of matter from one form to another without a change in chemical properties.
Salt dissolves in water because water has moving molecules.
how quickly they happen
it is now made of a softer substance
Rusting is a chemical change, fire is not
Salt will dissolve more quickly if it is stirred than if it is heated or left alone.
Physical
True
It uses water.
What is the main difference between fire and respiration?
Salt dissolves in water because water has moving molecules.
how quickly they happen
it is now made of a softer substance
Rusting is a chemical change, fire is not
Salt will dissolve more quickly if it is stirred than if it is heated or left alone.
Physical
True
It uses water.
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