Chemistry /ATI TEAS: Chemical Reactions
What happens during a chemical reaction?
Atoms, molecules, or compounds interact and change to form new substances.
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Key Terms
Term
Definition
What happens during a chemical reaction?
Atoms, molecules, or compounds interact and change to form new substances.
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What is a molecule?
An arrangement of 2 or more atoms (any element) bonded together.
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What is a compound?
A substance made of 2 or more elements.
What is a chemical equation?
A mathematical representation of a chemical reaction, with reactants on the left and products on the right, separated by an arrow.
What is a single replacement reaction?
An element reacts with a compound and takes the place of another element in the compound.
What is a double replacement reaction?
Two compounds react, causing the + and - ions of the two substances to change places.
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| Term | Definition |
|---|---|
What happens during a chemical reaction? | Atoms, molecules, or compounds interact and change to form new substances. |
What is a molecule? | An arrangement of 2 or more atoms (any element) bonded together. |
What is a compound? | A substance made of 2 or more elements. |
What is a chemical equation? | A mathematical representation of a chemical reaction, with reactants on the left and products on the right, separated by an arrow. |
What is a single replacement reaction? | An element reacts with a compound and takes the place of another element in the compound. |
What is a double replacement reaction? | Two compounds react, causing the + and - ions of the two substances to change places. |
What is a decomposition reaction? | A compound breaks apart into smaller parts. |
What is a synthesis reaction? | Two substances combine to create a more complex product. |
What is oxidation-reduction (redox) in chemical reactions? | A transfer of elections between 2 chemical species. Reduction comes from gain of electron, oxidation comes from loss of electron. Combustion, rust, energy formation. |
What is dissolution? | Ions that make up a solid are pulled apart and coated in water. |
What is an acid? | A substance with a pH less than 7 that transfers a proton to another molecule. |
What is a base? | A substance with a pH more than 7 that accepts a proton from another molecule. |
What are the products of an acid-base reaction? | Salt and water. |
What factors influence the rate of a reaction? | Concentrations, temperature, pressure, pH, and the presence of a catalyst. |
What is an endothermic reaction? | A reaction that absorbs heat, causing the reaction rate to increase as temperature rises. |
What is an exothermic reaction? | A reaction that releases heat, causing the reaction rate to slow as temperature rises. |
Name a neutral substance in the body. | Blood. |
Name some basic substances. | Soap, baking soda, ammonia, and bleach. |
Name some acidic substances. | Coffee, lemon juice, and battery acid. |