CHENISTRY QUESTIONS FOR GRADE TEN

Here are some chemistry questions suitable for a Grade Ten student:

1. Atomic Structure:

   • An atom has 17 protons, 18 neutrons, and 17 electrons.
     • What is its atomic number?
     • What is its mass number?
     • What element is it?
     • Is this atom electrically neutral, a cation, or an anion? Explain your reasoning.

2. Periodic Table & Bonding:

   • Explain the difference between an ionic bond and a covalent bond. Provide an example of a compound formed by each type of bond.
   • Which group on the periodic table contains the most reactive nonmetals? Why are they so reactive?

3. Chemical Reactions & Equations:

   • Balance the following chemical equation: C₂H₆(g) + O₂(g) → CO₂(g) + H₂O(g)
   • Classify the following reaction type: 2KClO₃(s) → 2KCl(s) + 3O₂(g)

4. Acids and Bases:

   • What does the pH scale measure?
   • Give an example of a common acid and a common base found in your home.

5. Mole Concept (Basic):

   • Calculate the molar mass of water (H₂O). (Atomic masses: H = 1.01 g/mol, O = 16.00 g/mol)