Chemistry 2024 paper 1
Study online at https://quizlet.com/_fjubxc
1. 1.1: Copper sulfate+water
2. 1.2: Residue of copper carbonate at the bottom of the beaker.
3. 1.3: To remove excess copper
4. 1.4: Bunsem burner
5. 1.5: 92.8=mass/12.5 x100
0.928x12.5 = mass = 11.6
6. 1.6: Copper has low reactivity so it will take a long time to react
Sodium has high reactivity so it will react aggressively with sulfuric acid which is a
hazard
7. 2.1: Simi- both have 1 electron in their outer shell
Diff- sodium has 2 full shells but potassium has 3
8. 2.2: Lilac flame
Potassium starts to float in water
9. 2.3: Blue/purple
Potassium hydroxide has hydroxide so it is alkali
10. 2.6: Chloride and potassium bromide
11. 2.7: Molecular mass abd boiling point increases
12. 3.1: Plum pudding model
Nuclear/bohr model
13. 3.2: Plum pudding model-ball of positive charge with electrons embedded but
today nucleus contains positive charge at centre of atom
Today model of atom has electrons in shells that surround the nucleus.
Today neutrons in nucleus before not discovered
14. 3.3: Same number of protons and electrons but diff number of neutrons
15. 4.3: Cup holds heat better causing the heat output of the reaction to be more
accurate
16. 4.5: Add up divide by 4 range is 3
17. 4.6: Copper sulfate initial temp may have been diff
18. 5.1: Calcium loses 2 electrons and give one to each chlorine atom so they can
have a full outer shell.
Results in ca2+ and 2cl -
They electostatically attract to form calcium chloride
1/1
Study online at https://quizlet.com/_fjubxc
1. 1.1: Copper sulfate+water
2. 1.2: Residue of copper carbonate at the bottom of the beaker.
3. 1.3: To remove excess copper
4. 1.4: Bunsem burner
5. 1.5: 92.8=mass/12.5 x100
0.928x12.5 = mass = 11.6
6. 1.6: Copper has low reactivity so it will take a long time to react
Sodium has high reactivity so it will react aggressively with sulfuric acid which is a
hazard
7. 2.1: Simi- both have 1 electron in their outer shell
Diff- sodium has 2 full shells but potassium has 3
8. 2.2: Lilac flame
Potassium starts to float in water
9. 2.3: Blue/purple
Potassium hydroxide has hydroxide so it is alkali
10. 2.6: Chloride and potassium bromide
11. 2.7: Molecular mass abd boiling point increases
12. 3.1: Plum pudding model
Nuclear/bohr model
13. 3.2: Plum pudding model-ball of positive charge with electrons embedded but
today nucleus contains positive charge at centre of atom
Today model of atom has electrons in shells that surround the nucleus.
Today neutrons in nucleus before not discovered
14. 3.3: Same number of protons and electrons but diff number of neutrons
15. 4.3: Cup holds heat better causing the heat output of the reaction to be more
accurate
16. 4.5: Add up divide by 4 range is 3
17. 4.6: Copper sulfate initial temp may have been diff
18. 5.1: Calcium loses 2 electrons and give one to each chlorine atom so they can
have a full outer shell.
Results in ca2+ and 2cl -
They electostatically attract to form calcium chloride
1/1
