Grade12

What is the atomic number of carbon?

• 6

• 12

• 5

• 7

Define the term 'molarity'.

• Molarity is the mass of solute per liter of solution.

• Molarity is the number of moles of solute per liter of solution.

• Molarity is the volume of solute in milliliters per liter of solution.

• Molarity is the concentration of a gas in the atmosphere.

What is the pH scale used for?

• The pH scale is used to measure the acidity or alkalinity of a solution.

• To assess the viscosity of a solution.

• To determine the color of a solution.

• To measure the temperature of a solution.

Explain the difference between ionic and covalent bonds.

• Covalent bonds are stronger than ionic bonds due to their nature of forming crystals.

• Ionic bonds involve electron transfer and attraction between ions, while covalent bonds involve electron sharing between atoms.

• Ionic bonds occur only in metals, while covalent bonds occur in non-metals.

• Ionic bonds are formed by sharing electrons, while covalent bonds involve electron transfer.

What is the law of conservation of mass?

• Mass is conserved in chemical reactions; it cannot be created or destroyed.

• Mass can be created in chemical reactions.

• Mass can be destroyed during a reaction.

• Mass is only conserved in physical changes.