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Chemical Reactions
7th Grade Physical Science
Question | Answer |
---|---|
The process in which atoms are rearranged to produce new substances. | chemical reactions |
A formula that uses chemical symbols and numbers to represent a given substance. | chemical formula |
An expression that uses symbols to show the relationship between the starting substances and the substances that are produced by a chemical reaction. | chemical equation |
The substances that participate (start) in a chemical reaction. | reactants |
The substances formed in a chemical reaction. | products |
The law that states that matter is neither created nor destroyed in ordinary physical and chemical changes. | Law of Conservation of Mass |
What is it called when writing a chemical equation and making sure you have the same number of atoms in reactants and products. | balancing the equation |
A chemical reaction that requires an input of energy by absorbing energy from its surroundings. | endothermic reaction |
A chemical reaction in which energy is released into its surroundings. | exothermic reaction |
The law that states that energy cannot be created or destroyed, but can change form. | Law of Conservation of Energy |
Describes how fast a reaction occurs. | Reaction Rates (4 factors that speed up reactions; concentration, surface area, temperature, and presence of a catalyst) |