Chemistry Revision

Organics

100

How is oil and natural gas formed?

Decomposition of ancient organisms buried under sediment.  

200

How is coal extracted? 

Mining: 1. surface mining 2. underground mining 

300

Why do we need fractional distillation? 

We need to separate the mixture as crude oil contains many different fuels. 

400

What is the difference between intermolecular forces and intramolecular forces? 

Intramolecular is inside a molecule. 

Intermolecular is between molecules. 

500

What is the difference between alkane, alkene and alkyne bonds? 

Alkane: single bonds 

Alkene: double bonds 

Alkyne: triple bonds 

Quantitative

100

What is the molar mass of Hcl? 

36.4 g/mol 

200

If you react 1 mol of NaOH with 2 mols of HCl, which compound is the limiting reactant? 

NaOH

300

How many moles are there in 5.97 grams of NaOH? 

around 0.14 mols 

400

What is Avogadro's number? 

6.02x10^23 particles = 1mol 

500

A student calculated the theoretical yield of BaSO4 (s) in a precipitation experiment to be 1.352 grams. When she filtered, dried, and weighed her precipitate, however, her yield was only 1.279 grams. Calculate the student’s percent yield.

94.6%

Acids and Bases

100

What does pH stand for? 

The power of Hydrogen 

200

What is the neutral pH value? 

7

300

What is the difference between concentration and strength? 

Concentration: How much matter(solute) is dissolved in a solvent and the units are per mol dm-3

Strength: Describes how the substance reacts with water 

400

What are the causes of acid rain? 

Air pollution: Car emissions, factory emissions etc. 

500

What are amphiprotic substances able to do? 

They can donate and accept protons. 

Redox

100

What oxidation number does an element have in elemental form? Ex. O₂

0 

200

What is oxidation? (3 definitions)

1. Addition of Oxygen 

2. Loss of Hydrogen 

3. Loss of electrons 

300

What does LEO the lion goes GER stand for? 

Loss of electrons is oxidation 

Gain of electrons is reduction 

400

What is the difference between an electrolysis cell and a voltaic cell? 

The voltaic cell produces its own energy whereas the electrolysis cell requires a battery pack. 

500

Write the half equations for the oxidation and reduction  of Copper.  

Cu = Cu²⁺+2e^-

Cu²⁺+2e^- = Cu 

Random

100

Around how many bricks were used to build this school? 

Around 2 million 

200

What is the pH of blood? 

close to 7.4 

300

What is the capital city of Australia? 

Canberra 

400

What is the national animal of Scotland? 

Unicorn 

500

How many bones are in the human body? 

206