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| Questão | Responda |
| I use letters and numbers to represent the amounts of reactants and products involved in a chemical change. What am I? | chemical equation |
| I am a substance present before a chemical change. What am I? | reactant |
| I am the force that holds together atoms that attach to other atoms. What am I? | chemical bond |
| I am the type of chemical reaction that releases energy. What am I? | exothermic |
| I produce new substances with chemical properties that are different from those of the original elements. What am I? | chemical change |
| I am the substance produced in a chemical change. What am I? | product |
| I am the type of chemical reaction that absorbs energy. What am I? | endothermic |
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