Reactivity of Metals with Water

The lesson explores how different metals react with water, highlighting vigorous reactions of calcium and lithium, and the non-reactive nature of metals like gold, silver, and copper. It introduces the reactivity series, explaining the order of metal reactivity. The lesson concludes with a review of chemical reactions and encourages students to answer questions based on the material covered.

Why is it important to understand the reactivity of metals with water?

• To prevent rusting and ensure safe usage

• To make metals more expensive

• To change the color of metals

• To increase the weight of metals

Which metal shows a vigorous reaction with water, producing a bright flame?

• Calcium

• Lithium

• Copper

• Gold

What is a unique property of gold that makes it valuable for jewelry?

• It remains shiny and does not rust

• It rusts over time

• It changes color frequently

• It reacts with water

Which of the following metals does not react with water?

• Calcium

• Lithium

• Silver

• Potassium

In the reactivity series, which metal is the most vigorous?

• Sodium

• Potassium

• Gold

• Copper

What happens when magnesium reacts with water?

• It forms magnesium sulfate

• It forms magnesium chloride

• It forms magnesium hydroxide and hydrogen

• It forms magnesium oxide

Which metal is less vigorous: zinc or magnesium?

• Zinc

• Magnesium

• Both are equally vigorous

• Neither reacts with water

What color change occurs when red litmus paper is placed in magnesium hydroxide?

• Red to green

• Red to blue

• Red to yellow

• Red to purple

Which metal remains shiny for hundreds of years due to its non-reactivity with water?

• Iron

• Lead

• Gold

• Aluminum

Which metal reacts more vigorously with water: potassium or sodium?

• Both react equally

• Sodium

• Potassium

• Neither reacts with water