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ScienceTest Unit 2+3
Question | Answer |
---|---|
Compound | two or more different atoms banded together |
Chemical Formula | uses chemical symbols to represent the atoms of the element and their ratios in a chemical compound |
ionic bonds | the electric attractions between positive and negative ions |
covalent bonds | the bond between two atoms sharing electrons |
Chemical reactions | the process by which chemical change occurs |
reactants | the substance present at the beginning of a chemical reaction they are broken bonds |
products | the substances formed by a chemical reaction they form bonds |
the law of conversation of mass | atoms are not created or destroyed in a chemical reaction |
coefficient | it indicates how many molecules take part in the reaction Ex: 2H2O |
Exothermic reaction | a reaction in which energy is released |
Endothermic reaction | a reaction in which energy is absorbed |