What happens when sodium reacts with water?

• forms sodium chloride and oxygen gas

• produces sodium carbonate and nitrogen gas

• forms sodium hydroxide and hydrogen gas

• creates sodium sulfate and carbon dioxide gas

When a metal reacts with hydrogen in acid, what is the product formed?

• Metal salt and hydrogen gas

• Metal chloride and carbon dioxide

• Metal oxide and water

• Metal hydroxide and oxygen gas

In the reaction between magnesium and copper sulphate, which metal replaces the other?

• Magnesium

• Iron

• Sulphur

• Copper

What is the general chemical equation for the reaction of sodium with water?

• 2Na + 2H2O -> Na2O + H2

• 2Na + 2H2O -> 2NaH + O2

• 2Na + 2H2O -> Na2H2O2 + H2O

• 2Na + 2H2O -> 2NaOH + H2

When a metal reacts with hydrogen in acid, what gas is evolved?

• Carbon dioxide gas

• Nitrogen gas

• Oxygen gas

• Hydrogen gas

In the reaction between magnesium and copper sulphate, what is the color change observed?

• From blue to red

• From yellow to green

• From colorless to black

• From blue to colorless

What are the products formed when sodium reacts with water?

• Sodium hydroxide and hydrogen gas

• Sodium oxide and water vapor

• Sodium chloride and oxygen gas

• Sodium carbonate and carbon dioxide

What is the name of the gas evolved when a metal reacts with hydrogen in acid?

• Carbon dioxide gas

• Nitrogen gas

• Hydrogen gas

• Oxygen gas

In the reaction between magnesium and copper sulphate, what is the metal that gets displaced?

• Magnesium

• Sulphur

• Copper

• Iron

In the chemical reactivity series, which element is the least reactive?

• Potassium

• Gold

• Sodium

• Lead