Question 1
Matter exists in three states which can be related as shown in the diagram below
Name processes
i) P
ii) R:
Answer
i) P: Evaporation
ii) R: Condensation
ii) R: Condensation
Question 2
a) Give one reason some of the laboratory apparatus are made of ceramics
b) Name two apparatus that can be used to measure approximately 75 cm of dilute sulphuric (VI) acid
Answer
a) Because they do not react with laboratory chemicals
b) - Measuring cylinder
- Beaker
b) - Measuring cylinder
- Beaker
Question 3
Draw the procedural set-ups that can be used to separate a mixture of sand and calcium chloride to obtain crystals of calcium chloride
Answer
Question 4
State two applications of chromatography
Answer
- To identify banned substances in sport
- To test for drug purity
- To test for drug purity
Question 5
The above set-up was used to determine the chemical properties of carbon (II) oxide
(a) Write the chemical equation for the reaction taking place in the combustion tube
(b) State and explain the observation made in the boiling tube
Answer
(a) COg + CuOs → Cus + CO2g
(b) Color of CuO changes from black to brown copper.
(b) Color of CuO changes from black to brown copper.