Year 8 Science Reactivity of Metals

What term is used to describe a reaction that produces a mixture of products?

• Single-displacement reaction

• Double-displacement reaction

• Combination reaction

• Decomposition reaction

Which metal reacts vigorously with water, producing hydrogen gas and forming a hydroxide?

• Sodium

• Copper

• Zinc

• Gold

Which of the following substances is commonly used as an inert filler in gas-filled electric bulbs?

• Oxygen

• Nitrogen

• Helium

• Argon

Which of the following salts generally becomes less soluble as temperature increases?

• Sodium chloride

• Potassium nitrate

• Calcium sulfate

• Copper sulfate

When metal reacts with oxygen, what type of compound is typically formed?

• Oxide

• Chloride

• Sulfide

• Nitrate

When a chemical reaction produces multiple products, what type of mixture is formed?

• Homogeneous mixture

• Pure substance

• Heterogeneous mixture

• Compound

How does the solubility of most salts change with an increase in temperature?

• It decreases

• It remains constant

• It increases

• It becomes unpredictable

What term is used to describe a solution that has dissolved the maximum amount of solute at a particular temperature?

• Unsaturated

• Saturated

• Dilute

• Concentrated

Which of the following gases is commonly known as an inert gas?

• Oxygen

• Nitrogen

• Argon

• Hydrogen

What does it mean if a substance is described as inert?

• It reacts with other substances vigorously

• It does not react with other substances under normal conditions

• It is highly toxic

• It is a strong oxidising agent