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10 terms

Chapter 6-Chemical Reactions:An Introduction

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Physical change
A change from one state (solid or liquid or gas) to another without a change in chemical composition
Chemical change
The change of substances into other substances through a reorganization of atoms;A chemical reaction
Physical property
A characteristic that can be observed or measured without changing the identity of the substance
Chemical property
A characteristic of a pure substance that describes its ability to change into different substances
Chemical equation
A representation of a chemical reaction showing the relative numbers of reactant and product molecules
Reactant
A chemical substance that is present at the start of a chemical reaction
Product
A chemical substance formed as a result of a chemical reaction
Catalyst
A substance that initiates or accelerates a chemical reaction without itself being affected
Exothermic reaction
A reaction that releases heat
Endothermic reaction
A reaction that absorbs heat