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100
The minimum amount of energy that has to be added to start a reaction
What is activation energy
100
A chemical equation that shows the same number of each kind of atom on both sides of the equation is said to be
What is balanced
100
The only sure evidence for a chemical reaction is
What is the production of one or more new substances
100
CaCo3 represents a chemical
What is formula
100
The number placed below an element's symbol in a chemical formula is called...
What is subscript
200
The best way to put out a small kitchen fire is to
What is cover it or use a home fire extinguisher
200
A shorter, easier way to show chemical reactions, using symbols instead of words
What is chemical equation
200
The principle of conservation of mass is true for what type of system?
What are open and closed systems.
200
What happens to matter in an open system?
What is matter can enter from and escape to the surroundings.
200
In chemical reactions, what does that principle of conservation of mass mean?
What is matter is not created or destroyed
300
A wet log will not burn easily because a large amount of _____________ must be added to the log to evaporate the water.
What is heat.
300
What two processes could be considered opposites?
What are synthesis and decompositon
300
What is chemistry
What is the study of matter and how matter changes.
300
a burning match is an example of a ________________, where matter can enter from or escape to the surroundings.
What is open system.
300
Chemicals that act as biological catalysts by speeding up a reactions in living things
What are enzymes
400
In what way can a fire be brought under control?
What is remove fuel, oxygen or heat
400
A rapid reaction betweeen oxygen and fuel is known as
What is combustion
400
In a chemical equation, substances written on the right side of the arrow are called
What are products
400
What is the best form of fire safety?
What is fire prevention
400
Anything that has mass and takes up space is considered
What is matter
500
A chemical reaction that releases energy in the form of heat is a _____________________ reaction
What is exothermic
500
What is it called when chemical bonds break and new bonds form?
What is a chemical reaction.
500
A material used to decrease the rate of a reaction is called a ______________
What is inhibitor
500
A precipitate is a ________________ that forms from a solution during a chemical reaction.
What is solid.
500
A bottle of hydrogen peroxide that eventually turns into a bottle of water and oxygen gas is an example of a
What is decomposition reaction