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Chemical Reactions

TermDefinition
Exothermic Reaction When more energy is being released
Product an ending substance that is made during a chemical reaction
Reactant a starting substance that is part of a chemical reaction
Endothermic Reaction When more energy is absorbed
The number of Hydrogen atoms in H2O 2
The number of Oxygen atoms in H2O 1
chemical reaction a process in which atoms rearrange to form new substances
Examples of exothermic reactions Water & Acid / Campfire / Rusting / Nuclear Fission / Freezing water
Examples of endothermic reactions Dissolving salt in water / water evaporation / baking bread / photosynthesis / cooking an egg
the kind of chemical that can break down molecules Acid
Physical Change Often a phase change
Chemical Change One chemical substance is transformed into one or more different substances.
Chemical and Physical Change There can be a color change.
Chemical Change Hard to reverse
Chemical Change light, heat sound, bubbles or a precipitate can be formed
Physical Change Can be easily reversed (usually)
Physical Change No new products are formed
Physical Change texture, shape, temperature, and a change in the state of matter
State of Matter If a substance is a solid, liquid, or a gas.
Precipitate The production of a solid when two liquids are mixed together.
Chemical Equation A symbolic representation of the reactants and products in a chemical reaction.
Reactants The starting substances in a chemical reaction.
Products The final substances in a chemical reaction.
Law of Conservation of Mass No mass is gained or lost in a chemical reaction.
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