Question

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Answer 1

Answer

Oxygen = o2

Question 3

Fe= iron

Zn = zinc

ca= calcium

Mg = magnesium

Answer 2

Answer:

Explanation:

1. Calcium - Ca

  Aluminium - Al

  Zinc - Zn

  Sulphur - S

  Oxygen - O

  Chlorine - Cl

2. Two important difference between metals and non-metals are:

• Metals are good conductors of heat and electricity, whereas non-metals are not
• Metals form lusters, they reflect light from polished or freshly cut surfaces, whereas non-metals are dull.

3. Fe - Iron

   Zn - Zinc  

  Cu - Copper

  Mg - Magnesium

  Pb - Lead

  Ca - Calcium

  O - Oxygen

  H - Hydrogen

  C - Carbon

  N - Nitrogen

  S - Sulphur

4. a. CaO

   b. ZnS

   c. CuSO₄

5. 2H₂O represents two molecules of water

6. The formula of a substance tells us the number of atoms or each element present in the molecule.