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Chemical Change 5th

Words To know for the exam of Chemical & Physical Changes

TermDefinition
Phase Changes Phase Changes- When matter changes from one form to another ( solid, liquid, gas)
Freezing- Freezing- When matter changes from liquid to solid after heat is lost at 0 degrees Celsius
Melting- Melting- When matter changes from a solid to a liquid when heat is gained
Evaporation- Evaporation- When matter changes from liquid to a gas after gaining heat at 100 degrees Celsius
Condensation- Condensation- When matter changes form a gas to a liquid after losing heat.
Steam Steam- is the gas given off when a liquid changes to a gas ( like water in you iron  )
Five Chemical Properties Five Chemical Properties – are properties observed when one substances is changed into another
Flammability Flammability- ability of a substance to burn
Toxicity Toxicity- the degree to which something is poisonous
pH- pH- the acidity of a liquid substance
Reactivity Reactivity - the response of one substance to another
Rusting Rusting- iron reacting with oxygen
Burning- Burning- when something catches on fire
Reversible Reversible- the ability to return to how you
Compounds- Compounds- When atoms of two or more elements combine chemically, and form a compound with different properties than the individual elements from which it is made.
Molecules Molecules- the smallest unit of a compound is a molecule.
Chemical Reactions Chemical Reactions- when the atoms of two or more elements combine or split up to form a substance with different properties
Law of Conservation of Matter- states that matter cannot be created or destroyed. That means that the mass of any materials that have gone through a chemical change together will be the same after the experiment as it was before the experiment.
Six Signs of Chemical Reaction a. Heat b. Light c. Smoke/fumes d. Fizz/Bubbles e. New Solids f. Smells Different
Atoms- Atoms- the smallest unit of an element is an atom
Created by: Cjblount08
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