EXAM 2

Question 1

Endothermic vs. Exothermic

Answer 1

Endothermic: requires energy
Exothermic: energy is a product (think heat)

Question 2

Catalyst

Answer 2

Speeds up a chemical reaction by lessening the amount of energy required.

Question 3

Calorimetry + it’s equation

Answer 3

Measurement of heat energy changes in a chemical reaction 
Q= M x 🔺T x SH
q= calories 
m= mass of solution in calorimeter 
t= change in temperature 
sh= specific heat

Question 4

What are the 6 factors that influence chemical reaction rates?

Answer 4

1. Structure
2. Concentration
3. Physical State
4. Molecular Shape
5. Temperature
6. Presence of a Catalyst

Question 5

Chemical Equilibrium Reaction Equation

Answer 5

keq= [C]^y [D]^z / [A]^w [B]^x

Question 6

Acid Base Neutralization

Answer 6

Ax+By ➡️ Ay+Bx

Cross multiply charges and rearrange elements

Question 7

Self Ionization

Answer 7

[H3O+] x [OH-] = 1 x 10^-14

[H3O+]= 1 x 10^-14 / [OH-]

[OH-]= 1 x 10^-14 / [H3O+]

Question 8

pH Concept

Answer 8

pH= log [H3O+]

pH is the exponent of scientific notation for H3O only

antilog x = 10 ^x (type shift log)

pH levels: H3O greater than 10^-7 is acidic and less than 10^-7 is basic. For OH it is vice versa

Question 9

Collision Theory

Answer 9

1. Molecular Collisions: reactants interact with one another before any chemical reaction occurs
2. Activation Energy: minimum combined kinetic energy that colliding reactant particles must possess in order to gain a chemical reaction
3. Collision Orientation: must come together in proper orientation unless they are single or small.

Question 10

Boiling and Melting Points: 
Ethene
Propene
1-Butene
Methylpropene
Ethyne 
Propyne
1-Butyne
2-Butyne

Answer 10

169.1-103.7
185-47.6
185-6.1
140-6.6
81.8-84
101.5-23.2
125.9-8.1
32.3-27