y8 Reactions of alkali metals, magnesium

Reorder the following starting with the least reactive alkali metal

• potassium

• lithium

• sodium

Which gas is produced in reactions of alkali metals with water?

• oxygen

• carbon dioxide

• hydrogen

• nitrogen

Density of lithium, sodium and potassium is

• higher than density of water

• lower than density of water

• the same as density of water

What is the pH of the solution formed when an alkali metal reacts with water?

• less than 7

• 7

• higher than 7

What is the word equation for the reaction between sodium and water?

• Sodium + Water → Sodium Oxide + Hydrogen

• Sodium + Water → Sodium Hydroxide + Hydrogen

• Sodium + Water → Sodium Chloride + Hydrogen

• Sodium + Water → Sodium Hydroxide + Oxygen

Which of the following statements is TRUE about the reaction of alkali metals with water?

• The reaction produces a weakly acidic solution.

• The reaction is exothermic and may produce enough heat to ignite hydrogen gas.

• The reaction only occurs with potassium and cesium.

• It produces a white solid.

Which of the following alkali metals reacts most violently with water?

• Lithium

• Sodium

• Potassium

• Magnesium

What happens to the pH of the solution when an alkali metal reacts with water?

• It becomes acidic.

• It becomes neutral.

• It becomes alkaline.

• It remains unchanged.

What is the main safety concern when alkali metals react with water?

• The formation of poisonous gas.

• The release of toxic metals.

• The formation of acidic solutions.

• The production of heat and possible explosion.

What should you always wear when conducting a lab experiment involving alkali metals and water?

• Safety goggles only

• Lab coat and gloves

• Safety goggles, lab coat, and gloves

• Only a lab coat and apron