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Unlike chemical changes, physical changes can be ____. acidic
When water (a liquid) boils, it ____ into steam (a gas). attract
Fossil fuels and nuclear power are ____ energy resources. dissolve
A solution with a pH less than 7 is ____. evaporates
Salt and sugar ____ quickly in hot water. increases
When a spring is stretched, its potential energy ____. nonrenewable
There are ____ meters (m) in one kilometer (km). reversed
Positive and negative charges ____ each other. thousand

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