## Thursday, 12 September 2013

### Reactions of Metals

Metals have three common corrosion reactions:

1. metal + oxygen --> metal oxide
2. metal + water --> metal hydroxide + hydrogen gas
3. metal + acid --> metal salt + hydrogen gas

We will then use the results of our investigation (of the reactions of Pb, Mg, Ca and Al) to create an Activity Series.

## Tuesday, 6 August 2013

### Collision Theory

Why do some reactions happen quickly? Why do some chemicals not react at all when mixed together?

## Friday, 2 August 2013

Here is a site that has some good practice for balancing equations

http://education.jlab.org/elementbalancing/

## Wednesday, 31 July 2013

### Balancing Equations

#### STEP ONE

Identify the type of reaction, so identify the products.
e.g. acid + base --> water + salt
e.g. acid + metal --> hydrogen + salt

#### STEP TWO

Work out the formula of the salt. Use "drop-and-swap",  but remember that this is just a method for finding the electrically-neutral ratio of ions.

#### STEP THREE

Balance the atoms using large numbers to change the quantity of each compound/molecule/atom.

## Sunday, 14 July 2013

### Acids and Bases

Acids and Bases

an acid is a chemical compound that has extra hydrogen ions that it can loose. We found that when an acid is mixed with a base, a salt and water is produced. on the P.H. scale which is the standard way of measuring acids and bases the acids are between 0 and 6.9 and bases are from 7.1 to 14. so that means that 7 is neutral.

salts are a neutral compound which is not table salt excluding the first experiment.
these are the results we have for the tests we did:

• hydrochloric acid + sodium hydroxide = sodium chloride + water
HCl + NaOH = NaCl +H2O
• hydrochloric acid + magnesium oxide = magnesium chloride + water
2HCl + MgO = MgCl2 + H2O
• nitric acid + sodium hydroxide = sodium nitrate + water
HNO3 + NaOH = NaNO3 + H2O
• nitric acid + magnesium oxide = magnesium nitrate + water
2HNO3 + MgO = Mg(NO3)2 + H2O
• sulfuric acid + sodium hydroxide = sodium sulfate + water
H2SO4 + NaOH = Na2SO4 +H2O this is not balanced
• sulfuric acid + magnesium oxide = magnesium sulfate + water
H2SO4 + MgO = MgSO4 + H2O
• ethanoic acid + sodium hydroxide = sodium ethanoate  + water
CH3COOH + NaOH = NaCH3COO + H2O
• ethanoic acid + magnesium oxide = magnesium ethanoate + water
2CH3COOH  + MgO = Mg(CH3COO)2 + H2O
• therefore
• acid + base = salt(not table salt) + water

Acids and Bases

an acid is a chemical compound that has extra hydrogen ions that it can loose. We found that when an acid is mixed with a base, a salt and water is produced. on the P.H. scale which is the standard way of measuring acids and bases the acids are between 0 and 6.9 and bases are from 7.1 to 14. so that means that 7 is neutral.

salts are a neutral compound which is not table salt excluding the first experiment.
these are the results we have for the tests we did:

• hydrochloric acid + sodium hydroxide = sodium chloride + water
HCl + NaOH = NaCl +H2O
• hydrochloric acid + magnesium oxide = magnesium chloride + water
2HCl + MgO = MgCl2 + H2O
• nitric acid + sodium hydroxide = sodium nitrate + water
HNO3 + NaOH = NaNO3 + H2O
• nitric acid + magnesium oxide = magnesium nitrate + water
2HNO3 + MgO = Mg(NO3)2 + H2O
• sulfuric acid + sodium hydroxide = sodium sulfate + water
H2SO4 + NaOH = Na2SO4 +H2O this is not balanced
• sulfuric acid + magnesium oxide = magnesium sulfate + water
H2SO4 + MgO = MgSO4 + H2O
• ethanoic acid + sodium hydroxide = sodium ethanoate  + water
CH3COOH + NaOH = NaCH3COO + H2O
• ethanoic acid + magnesium oxide = magnesium ethanoate + water
2CH3COOH  + MgO = Mg(CH3COO)2 + H2O
• therefore
• acid + base = salt(not table salt) + water