Paper 2 Shits

Question 1

Factors affecting rate of reaction?

Answer 1

• Concentration
• Pressure of reacting GASES
• Surface area
• Temperature
• Presence of catalysts

Question 2

Pure Substance

Answer 2

Single element or compound not mixed with any other substances

Question 3

How can we distinguish pure substances

Answer 3

They melt and boil at specific temperatures, so MELTING AND BOILING POINT DATA can be used

Question 4

Example of a pure substance

Answer 4

Pure milk

Question 5

What temperatures do impure substances boil at?

Answer 5

They melt and boil over a range of teperatures

Question 6

How do impurities (such as salt) affect melting and boiling point?

Answer 6

• it DECREASES the melting point

- it INCREASES the boiling point

Question 7

Formulations

Answer 7

Mixtures that have been prepared USING A SPECIFIC FORMULA, with PRECISE AMOUNTS of different components, which have a PARTICULAR FUNCTION

Question 8

Examples of Formulations

Answer 8

• Fuels
• Alloys
• Food and drink
• Paint
• Fertilisers
• Medicines
• Cleaning agents

Question 9

What must be taken into account when working out the RF value?

Answer 9

• Type of paper used

- Type of solvent used

Question 10

Composition of the Earth’s atmosphere?

Answer 10

• 80% nitrogen
• 20% oxygen
• Small proportions of other gases, CO2, Water vapour, Noble Gases