Show:
7.1: Describing Reactions
7.2: Types of Reactions
7.3: Energy Changes in Reactions
7.4: Reaction Rates
7.5: Equilibrium
100
What is the law of conservation of mass?
states that mass is neither created nor destroyed.
100
A + B ---> AB is what type of reaction?
synthesis
100
What is chemical energy?
The energy stored in the chemical bonds of a substance
100
What does a reaction rate tell you?
How fast a reaction is going
100
What is equilibrium?
a state in which the forward and reverse paths of a change take place at the same rate
200
Why must chemical equations be balanced?
in order to show that mass is conserved during a reaction
200
AB ---> A + B is what type of reaction?
decomposition
200
Chemical reactions involve the breaking of chemical bonds in the _____ and the formation of bonds in the _______
reactants; products
200
What three factors cause reaction rates to change?
temperature, surface area, and concentration
200
When a physical change (does/does not) go to completion, a physical equilibrium is established between the forward and reverse changes.
does not
300
Balance the equation: N2H4 + O2 ----> N2 + H2O
N2H4 + O2 ---> N2 + 2H2O
300
A + BC ---> AB + C
Single replacement
300
Chemical reactions involve the breaking of bonds in the _______ and the forming of bonds in the ________.
Reactants, products
300
What is a type of biological catalyst?
an enzyme
300
What is a reverse reaction?
a reaction in which the conversion of reactants into products and the conversion of products into reactants can happen simultaneously
400
How do I calculate molar mass?
By taking the atomic mass of an element and multiplying by its subscript then adding up all the atomic masses together
400
AB + CD ---> AC + BD is what type of reaction?
double replacement
400
During a chemical reaction, energy is either ______ or ______.
released; absorbed
400
Stirring the reactants will generally ________ the reaction rate?
increase
400
When a chemical reaction (does/does not) go into completion, a chemical equilibrium is established between the forward and reverse reactions.
does not
500
How many moles are present in 34 g or Cu(OH)2?
.35 moles
500
A reaction in which electrons are transferred from one reactant to another is called...
oxidation-reduction (redox)
500
A chemical reaction that absorbs energy is called an _________ reactions. A chemical reaction that releases energy is called an ______ reaction.
endothermic; exothermic
500
Explain why reactions take place faster at higher temperatures.
Reacting particles movie faster on average at higher temperatures; as a result, they collide with each other more often and with greater energy
500
What three factors affect chemical equilibrium?
temperature, pressure, and concentration