Chemistry Final Exam Sem. 1 P(3) Dec. 2024

Front

How do potassium (K) and sulfur (S) bond together?

Back

Potassium (K) has a charge of +1 (K⁺) and sulfur (S) has a charge of -2 (S²⁻). To balance the charges, two potassium ions are needed for every sulfur ion, resulting in the formula K₂S.

Front

What is the concentration of 1 mole of sodium chloride (NaCl) in 1 dm³ of solution?

Back

1 mole/dm³.

Front

What is the concentration of 0.5 mole of aluminum oxide (Al₂O₃) in 1 dm³ of solution?

Back

0.5 mole/dm³.

Front

What volume of solution is needed to make up a solution of copper (II) chloride (CuCl₂) of 8 moles and concentration 2 mol/dm³?

Back

4 dm³ (using the equation V = n/C).

Front

In naming an ionic compound, what do you change the ending of the second element to?

Back

-ide.

Front

What is the formula for calculating concentration?

Back

Concentration (C) = Amount of solute (n) / Volume of solution (V).

Front

What is the charge of a sulfate ion (SO₄²⁻)?

Back

-2.

Front

What is the molar mass of sodium chloride (NaCl)?

Back

58.44 g/mol.

Front

What is the difference between ionic and covalent bonds?

Back

Ionic bonds involve the transfer of electrons, while covalent bonds involve the sharing of electrons.

Front

What is the formula for calculating the number of moles?

Back

Number of moles (n) = Mass (g) / Molar mass (g/mol).