1. A mixture of sugar and water can be separated by ______.

Evaporation Filtration Decantation Sublimation

2. An example of a mixture that can be separated by the method of filtration is ______.

Sugar in water Sand in water Oil in water Ink in water

3. A mixture of sand and common salt could be separated by ______.

Filtration and distillation Dissolution and evaporation Dissolution, sedimentation and evaporation Dissolution, filtration and evaporation

4. Which of the following substances is a mixture?

Water Sodium chloride Sodium chloride solution Iron filing

5. Salt could be obtained from seawater by ______.

Boiling Condensation Decantation Evaporation

6. Which of the following processes results in the formation of new substances?

Cooling water to form ice Adding saliva to cooked yam Dissolving sugar in water Mixing iron dust and sand

7. An atom has 5 protons and 5 neutrons in its nucleus. How many electrons are present in the atom?

5 1 2 9

8. An atom has a proton number of 17 and a neutron number of 18. Determine the number of electrons in the third shell of the atom.

7 1 3 5

9. The chemical formula Cl₂ represents two ______.

Atoms of chlorine Neutrons of chlorine Ions of chlorine Molecules of chlorine

10. Which of the following particles constitute matter?

Atoms only Atoms and molecules only Atoms, molecules, and ions Molecules and ions only