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Unit 2.2 Vocabulary

Unit 2.2- Chemical Reactions

TermDefinition
Atom the smallest part of a substance that cannot be broken down chemically
Molecule two or more atoms connected by chemical bonds, SAME or DIFFERENT (compound)
Chemical Reaction A process where substances interact to form new substances with different properties.
Reactants The starting substances in a chemical reaction, which are changed during the reaction.
Products The new substances formed as a result of a chemical reaction.
Mass A measurement that refers to the amount of matter that makes up an object.
Conservation of Mass A principle stating that mass remains the same before and after a chemical reaction; atoms are only rearranged, not created or destroyed.
Properties Characteristics or traits of a substance, like color, smell, melting point, and reactivity, which can change in a chemical reaction.
Evidence of a Chemical Change Observations that suggest a chemical reaction has occurred, such as color change, temperature change, gas production, or the formation of a solid (precipitate).
Energy The ability to do work or cause change; can be absorbed or released during a chemical reaction.
Endothermic Reaction A type of chemical reaction that absorbs energy, often making the surroundings feel cooler.
Exothermic Reaction A type of chemical reaction that releases energy, often making the surroundings feel warmer.
Thermal Energy Energy related to temperature; can be absorbed or released in chemical reactions.
Model A visual or physical representation of a scientific concept, such as a diagram showing how atoms rearrange in a reaction.
Data Information gathered from observations, measurements, or tests, used to analyze results and support conclusions.
Created by: MsOlivia
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