Q3.Which of the following is true about chemical reactions? (Choose 1)
A new substance is made
They always get hotter
They always involve a gas
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A new substance is made
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A new substance is made
A physical change, such as a state change or dissolving, does not create a new substance, but a chemical change does. ... In a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.
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