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