Lesson 1
Lesson 2
Lesson 3
Random
100
Physical changes occur when existing bonds break and new bonds form.
True or False
False
100
Matter can enter from or escape to the surroundings from what type of system?
Open System
100
Chemicals that act as biological catalysts by speeding up reactions in living things are called
Enzymes
100
A shorter, easier way to show a chemical reaction, using symbols instead of words, is called a
chemical equation
200
A chemical reaction that absorbs energy in the form of heat is described as
endothermic
200
What type of reaction is
FeS + 2 HCl FeCl2 + H2S?
Replacement Reaction
200
Every chemical reaction involves a change in
energy
200
The amount of matter in a chemical reaction changes.
True or False
False
300
In chemical reactions, what does the principle of conservation of mass mean?
Matter is not created or destroyed
300
The substances listed on the left side of a chemical equation are the
reactants
300
The only sure evidence for a chemical reaction is
the formation of a new substance
300
What is Chemistry?
The study of o.l/kmatter and how matter changes.
400
What happens when chemical bonds break and new bonds form?
A chemical change
400
What reaction is the process of making a more complex compound FROM simpler substances
Synthesis
400
The minimum amount of energy needed to start a reaction is the
activation energy
400
Which two processes or reactions could be considered opposites?
Sythesis and Decomposition
500
CaCO3 represents a chemical
formula
500
A bottle of hydrogen peroxide that eventually turns into a bottle of water and oxygen gas is an example of what type of reaction?
Decomposition
500
A material used to decrease the rate of a chemical reaction is a(n)
inhibitor
500
Balance this chemical equation:
KClO3 ------->KCl + O2
2KClO3-----> 2KCl + 3O2