Chemistry CAT 1

What is the chemical symbol for gold?

• Fe

• Au

• Ag

• Pb

Write the chemical formula for water.

• H2O2

• H2O

• O2H

• H2O3

What is rusting and what causes it?

• Rusting is the process of melting iron at high temperatures.

• Rusting is the oxidation of aluminum when exposed to air.

• Rusting occurs only in dry environments without moisture.

• Rusting is the corrosion of iron due to its reaction with oxygen and moisture, resulting in the formation of rust.

List two methods to prevent rusting of iron.

• 1. Apply protective coatings (e.g., paint, galvanization); 2. Use corrosion-resistant alloys.

• Use iron in high humidity

• Expose iron to saltwater regularly

• Store iron in a dry place

What is the chemical formula for oxygen gas?

• O2

• H2O

• O3

• CO2

Explain the kinetic theory of matter in simple terms.

• Particles in matter are always at rest regardless of temperature.

• The kinetic theory of matter explains that matter is made of particles in constant motion, with their energy and speed influenced by temperature.

• Matter is made of solid objects that do not move.

• The kinetic theory states that matter is only made of gases.

What is the role of moisture in the rusting process?

• Moisture prevents rusting by creating a protective layer on iron.

• Moisture accelerates the rusting process by acting as an electrolyte that facilitates the reaction between iron and oxygen.

• Moisture has no effect on the rusting process whatsoever.

• Moisture only contributes to rusting in dry environments.

Name a common household item that can prevent rusting.

• Water

• Vinegar

• Salt

• Oil

Describe how oxygen can be prepared in a laboratory setting.

• Oxygen can be generated by mixing vinegar and baking soda.

• Oxygen can be produced by burning magnesium in air.

• Oxygen can be prepared by dissolving sodium chloride in water.

• Oxygen can be prepared by heating potassium chlorate with manganese dioxide.

What are the three states of matter according to the kinetic theory?

• solid, liquid, plasma

• plasma, vapor, crystal

• gas, liquid, foam

• solid, liquid, gas