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Vocab 1
Vocab 2
Vocab 3
Vocab 4
Vocab 5
100
anything that has mass and takes up space
What is matter?
100
material that releases energy when it burns
What is fuel?
100
study of matter and how it changes
What is chemistry?
100
number you place in front of a chemical formula in an equation
What is a coefficient?
100
short easy way to show a chemical reaction, using symbols instead of words
What is a chemical equation?
200
the substances you have at the beginning of a reaction
What are reactants?
200
minimum amount of energy needed to start a chemical reaction
What is activation energy?
200
the substances you have when a reaction in complete
What are products?
200
rapid reaction between oxygen and a substance called fuel
What is combustion?
200
characteristic that can be observed without changing the substance into another substance
What is a physical property?
300
states that during a chemical reaction, matter is not created nor destroyed
What is law of conservation mass?
300
a change that alters the appearance
What is a physical change?
300
matter can enter from or escape to the surroundings
What is an open system?
300
solid that forms from solution during a chemical reaction
What is a precipitate?
300
matter is not allowed to enter or leave
What is a closed system?
400
material that increases the rate of a reaction
What is a catalyst?
400
2 or more elements combine to make a more complex substance
What is synthesis?
400
breaks down compounds into simpler products
What is decomposition?
400
when one element replaces another in a compound, or when two elements in different compounds trade places
What is replacement?
400
decreases the rate of a reaction
What is an inhibitor?
500
energy is absorbed
What is endothermic?
500
biological catalysts
What are enzymes?
500
Three things necessary to start and maintain a fire
What are fuel, oxygen and heat?
500
amount of substance in a given volume
What is concentration?
500
energy is released
What is exothermic?