2nd Grade Science : Physical Science
Study concepts, example questions & explanations for 2nd Grade Science
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Example Questions
Example Question #2 : Argue Changes Caused By Heating/Cooling Can Be Reversed
Which material can be heated or cooled, and then have the changes reversed?
Some objects or materials can be heated or cooled, and the changes caused can be reversed. Ice could have the changes applied to it reversed. If you heat ice, it will melt, you can refreeze it to turn it back to a solid. If you toast bread, bake a donut, or cook a marshmallow, that change cannot be reversed.
Example Question #3 : Argue Changes Caused By Heating/Cooling Can Be Reversed
Which photo represents a heating or cooling change that can be reversed?
None of the answer choices
The photo that represents a heating or cooling change that can be reversed is melting ice cream. The ice cream could be put back into the freezer, and it would no longer melt and would return to a solid.
Example Question #21 : Changes Caused By Heating And Cooling
An example of a change caused by heating or cooling that can be reversed would be the baking of a birthday cake.
True
False
False
The statement above is a false statement and an example of how heating and cooling can NOT be reversed. If you bake a cake, a chemical change has occurred when the heat was applied. This cannot be reversed, and the cake cannot be returned to a batter or individual ingredients.
Example Question #22 : Changes Caused By Heating And Cooling
This photo represents a change due to heating or cooling that can be reversed.
False
True
False
The statement above is a false statement and an example of how heating and cooling can NOT be reversed. Once a match is struck and lit, it cannot be reversed. The match can be put out, but it cannot "unlit" or brought back to its original state.
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