Molar Mass
Potential Energy Diagram
Kinetics
Types of Chemical Reactions
Endothermic or Exothermic?
100
What is Avogadro's number?
6.02 X 1023
100
Which letter represents the potential energy of the reactants?
B
100
As the number of effective collisions between reacting particles increases, the rate of the reaction...
a. increases
b. decreases
c. remains the same
increases
100
Which type of reaction combine two or more simple substances to form one product?
Synthesis reaction
100
Does this potential energy diagram show an exothermic reaction or an endothermic reaction?
Exothermic Reaction
200
Calculate the molar mass for:
H2O
18 g/mol
200
Which letter represents the potential energy of the products?
F
200
The energy needed to start a chemical reaction is called?
Activation energy
200
Identify the type of chemical reaction:
2Ag + H2S → Ag2S + H2
Single replacement
200
How do you know this chemical equation is exothermic?
Mg + HCl → MgCl2 + H2 + heat
The energy is on the product side, which means energy was released. If energy is released, then it is an exothermic reaction.
300
What is the gram formula mass of:
C3H5(OH)3 ?
92 g/mol
300
C
300
What will change when a catalyst is added to a chemical reaction?
Activation energy in the forward or reverse reaction
or
The potential energy of the activated complex
300
Given the equation:
C3H8 + 5O2 → 3CO2 + 4H2O
This reaction represents which type of reaction?
Combustion
300
An unknown solid was place in a test containing water that was at 32 degrees Celsius. After the solid had completely dissolved, the temperature of the liquid in the test tube was 5 degrees Celsius.
Endothermic
400
What is the mass of 3.0 moles of water, H2O?
54 g
400
D
400
In what type of reaction do the products of the reaction always possess more potential energy than the reactants?
Endothermic
400
If an equation is balanced properly, both sides of the equation must have the same number of what?
Atoms
400
1. Endothermic or Exothermic?
2. What is the heat of reaction?
4Fe (s) + 3O2 (g) → 2Fe2O3 (s) + 1640 kJ
Exothermic and -1640 kJ
500
Calculate the percent composition of oxygen in:
Ca(OH)2
43%
500
Which letter represents the activation energy for the reverse reaction?
E
500
Explain, in terms of kinetic energy and collision, how increasing the temperature of a reaction will increase the rate of that reaction.
As you increase the temperature of a reaction, the kinetic energy (speed) of particles increases and therefore increases the frequency and effectiveness of collisions.
500
1. Balance the following equation
2. Identify the type of chemical reaction it is:
___Fe (s) + ___O2 (g) → ___Fe2O3 (s)
4Fe (s) + 3O2 (g) → 2Fe2O3 (s)
Synthesis Reaction
500
Explain, in terms of the function of a catalyst, why the curves on the potential energy diagram for the catalyzed and uncatalyzed reactions are different
The curves are different because in a catalyzed reaction, the activation energy is less than an uncatalyzed reaction.