GCSE COMBINED SCIENCE HIGHER: CHEMISTRY 2018 PAPER 2

Notes:

Question 1) 

1.1 condenses

1.2 the fractions have different boiling points

1.3  propane

1.4 CnH2n + 2

1.5   CH4 + 2 O2 ----> CO2 + 2 H2O

1.6 Bromine water

1.7   To assess the environmental impact of the stages in the life of a product

 

Question 2)

2.1 methane

2.2  rising sea levels

 agricultural problems

2.3    6.0/ 4.1  x 0.0235 = 0.0344kg

2.4 use less plastic

2.5

Question 3)

3.1  16

3.2   advantage -  more accurate result

disadvantage -  takes a longer time, more energy needed

3.3   pure water -no  dissolved solids

portable water -  has dissolved solids

3.4  groundwater - filtered and sterilised

seawater - distilled 

3.5   2.2/100 x 6.50

answer: 0.143g

 

Question 4)

Question 5)

Question 6)
 

my answer: