Review

Question 1

Electronegativity

Answer 1

Measures how strongly an atom attracts electrons and determines the type of bond

Question 2

Which element has the highest electronegativity?

Answer 2

Fluorine

Question 3

Whats the scale for determining if a bond is covalent or ionic?

Answer 3

0-1.7 Covalent

> 1.7 Ionic

Question 4

Name the 5 types of of chemical reactions.

Answer 4

1) Synthesis
A+B—->A + B
2) Decomposition AB —–> A + B
3) Single Displacement AB + C ——> CB + A
4) Double Displacement AB + CD —–> AD + CB
5) Combustion CxHy + O2—–> H2O + CO2

Question 5

The equation for the number of moles?

Answer 5

n= m/ M

Question 6

Whats the equation for finding the mass?

Answer 6

m= Mn

Question 7

What is the equation for finding the concentration?

Answer 7

C= n/v

Question 8

What is the scale for determining if a solution is acidic or basic?

Answer 8

<7= Acidic 
>7 = Basic

Question 9

What are the 4 gas laws?

Answer 9

1) Boyles Law
P1V1=P2V2
2) Charles Law
V1/T1=V2/T2
3) Gay Lussac's Law
P1/T1=P2/T2
4) Ideal Gas Law
PV=nRT

Question 10

How do you convert a temperature in celsius to kelvin

Answer 10

Add 273

Question 11

What are the 5 Significant Digit rules?

Answer 11

1) All digits that are not zero are significant

Example: 16.2 (3 Sig Digs)

2) Zeros between non zero digits are significant

Example: 103 (3 Sig Digs)

3) Zeros to the left of the first non zero digit are not significant. They only show placement of the decimal point

Example: 0.02 (1 Sig Dig)

4) Zeros to the right of a decimal point are significant if they are at the end of a number

Example: 16.0 (3 Sig Digs)

5) When a number ends in a zero or zeros that are not to the right of a decimal point, the ending zero may or may not be significant

Example:

160. (3 Sig Digs) OR 160 (2 Sig Digs)

Question 12

Which direction are postive and negative exponents moving?

Answer 12

Postive: Moving left

Example: 4321. → 4.321

4.321 X 103

Negative: Moving right

Example: 0.25 → 2.5

2. 5 X 10-1
   * HINT*

If original number was less than 1= -

If the original number was greater than 1= +

Question 13

What are the 3 steps to add or subtract significant digits?

Answer 13

Step 1) Line up decimal numbers and add and subtract as normal

Step 2) Find the number in your adding or subtracting with the least number of sig digs after the decimal place

Step 3) Your answer should have the same number of sig digs to the right of the decimal as well.

Question 14

What are the 3 steps to multiply and divide sig digs?

Answer 14

Step 1) Multiply or divide the given values as normal

Step 2) Look at the number you multiplied or divided with the LEAST NUMBER OF TOTAL SIG DIGS

Step 3) Your answer should have the same number of total sig digs

Question 15

Review how to do Lewis structures for ionic and molecular compounds

Answer 15

.

Question 16

What are the 5 Significant Digit Rules?

Answer 16

1) All digits that are not zero are significant

Example: 16.2 (3 Sig Digs)

2) Zeros between non zero digits are significant

Example: 103 (3 Sig Digs)

3) Zeros to the left of the first non zero digit are not significant. They only show placement of the decimal point

Example: 0.02 (1 Sig Dig)

4) Zeros to the right of a decimal point are significant if they are at the end of a number

Example: 16.0 (3 Sig Digs)

5) When a number ends in a zero or zeros that are not to the right of a decimal point, the ending zero may or may not be significant

Example:

160. (3 Sig Digs) OR 160 (2 Sig Digs)