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18 terms

9.3 Flashcards

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Chemical change
Change in matter that produces a new substance with different properties from the original
Compound
Chemical combination of two or more elements

Ex: Rust
Chemical formula
Way of using letters and numbers to show how much of each element is in a substance
Covalent bond
When two atoms SHARE ELECTRONS
Ionic bond
When one atom "STEALS" an ELECTRON from another atom

Ex: Salt
Reactants
Original Substances in a chemical reaction (behind arrow)
Products
New substances formed in a chemical reaction (in front of arrow)
Synthesis reaction
2 elements or compounds JOIN TOGETHER to make a new compound

A + B --> AB
Decomposition Reaction
A compound BREAKS APART into simpler substances

AB --> A + B
Replacement Reaction
One element REPLACES another element in a compound

BX + A --> AX + B
Chemical property
Way of describing a substance by how it reacts chemically to other substances
Acid
pH less than 7; sour, corrosive, burns skin, wears away metal
Grapefruits, lemons, battery acid, vinegar
Acids
Base
pH greater than 7; bitter, usually poisonous, dissolves hair, wool, and grease
Drain cleaner, shampoo, bathtub cleaner
Bases
ENDOthermic
Chemical reactions that ABSORB ENERGY
EXOthermic
Chemical reactions that GIVE OFF HEAT
Hydrogen and Oxygen
2 atoms (elements) that make up a molecule of water