chemistry test, topic 3

Question 1

Q1.

Answer 1

D

Question 2

Q2. Describe what you would see when copper carbonate powder is added to dilute sulphuric acid

Answer 2

when it reacts with the sulphuric acid it will produce a cyan blue chemical called copper sulphate

Question 3

Q2. After reaction the liquid is

Answer 3

C neutral

Question 4

Q3. Explain why calcium carbonate is added until some solid remains

Answer 4

So solution (acid) is 100% neutralised

Question 5

Q3. Student experiment

Answer 5

Pipette to measure volume of HCL, put in flask, add calcium oxide and swirl, stop when reaction

Question 6

Q4. Explain ph change when acid is diluted with water

Answer 6

PH will increase as the water will bring the HCL closer to neutralisation which is PH 7

Question 7

Q5. Factor of 10

Answer 7

It would decrease by 10, so ph will equal what it is divided by 10

Question 8

Q7. Table

Answer 8

Soluble
Soluble
Insoluble

Question 9

Q8. Identify gas that each refers to

Answer 9

hydrogen
carbon dioxide
oxygen

Question 10

Q9. Write ionic reactions

Answer 10

H + ions + OH –> H2O

Question 11

Q10. Suggest name of gas

Answer 11

Sodium phosphate

Question 12

Q13. Which gas is given off?

Answer 12

Hydrogen

Question 13

Q13 ii formuła of zinc

Answer 13

C

Question 14

Q14. State the name of salt formed

Answer 14

Magnesium sulphate

Question 15

Q15.explain the difference between strong and weak acid

Answer 15

Strong acids fully ionise
weak ones only partially

Question 16

Q15 ii give a reason why hydroxide ions lead to a higher ph

Answer 16

because hydroxide ions neutralise which reduces H+ ions meaning higher PH

Question 17

Q16. Titration

Answer 17

They change colour gradually , titration is sudden colour change