## Chemistry

by Sam Theo
## 1. Equations

### 1.1. Mass = Moles x Mr

### 1.2. Moles = Mass / Mr

### 1.3. Mr = Mass / Moles

### 1.4. Mass Triangle

## 2. Mole

### 2.1. Molar Mass

2.1.1. Mr

2.1.2. Molecule

2.1.3. The relative molecular mass (Mr) of an element or compound is the mass of a molecule compared to 1/12 the mass of one atom of carbon-12.

### 2.2. an amount of a substance that contains as many elementary entities (e.g. atoms, molecules, ions, electrons) as there are atoms in 12 grams of pure carbon-12 (12C)

## 3. Atom

### 3.1. Relative Atomic Mass

3.1.1. Ar

3.1.1.1. New node

3.1.2. Atom

3.1.3. (Chemistry) the ratio of the average mass per atom of the naturally occurring form of an element to one-twelfth the mass of an atom of carbon-12

## 4. Techniques

### 4.1. Mass Produced

4.1.1. When calculating mass produced.

4.1.2. 1) Find what compounds they are asking you for

4.1.3. 2) Find which value has been given to you

4.1.4. 3) Apply that value to the given compound

4.1.5. 4) Use your equations to calculate first value

4.1.6. 5) Compare ratio to the next compound they want

4.1.7. 6) Use the ratio to times and divide or vise versa

4.1.8. 7) Now use your equations to find the answer!

### 4.2. Mass of Compound Needed

4.2.1. When calculating mass of compound needed.

4.2.2. 1) Use your values from the mass produced

4.2.3. 2) Look at the ratio between given compounds

4.2.4. 3) Make sure you use ratios in correct order

4.2.5. 4) Use the moles and molar mass to find mass

## 5. Research and work on Empirical Formulae