Pure Substances and Mixtures — CHEMISTRY STD 6 — Question

Prove experimentally that plants produce carbon dioxide during respiration.

Describe simple experiments to prove that liquids have mass

Describe a simple experiment with the help of a diagram to show that Air exerts pressure

State the ways to reduce water consumption at home.

Tabulate a comparative chart – to differentiate between elements, compounds, and mixtures. Differentiate them with reference to the term

Tabulate a comparative chart – to differentiate between elements, compounds, and mixtures. Differentiate them with reference to existence

With reference to the mixture of iron and sulphur, state the main characteristics of the mixture.

Elements are classified into – Metals – Non-metals – Metalloids – Noble gases. State which of A, B, C, D is a –

1. Metallic element
2. Non-metallic element
3. Metalloid
4. Noble gas.

A: Is non-malleable, non-ductile & a poor conductor of electricity ___________
B: Has lustre, is malleable and ductile & a good conductor of heat ___________
C: Is unreactive and inert and present in traces in the air _________
D: Shows properties of both metals and non-metals ___________

Draw a neat labelled diagram for the separation of the following mixture.
Naphthalene from sodium chloride

Give two differences between a physical change and a chemical change.