Understanding Displacement Reactions and Equations

What is the main reason magnesium can displace copper in a displacement reaction?

• Magnesium is more reactive than copper.

• Magnesium is more stable than copper.

• Magnesium is less reactive than copper.

• Magnesium has a higher atomic number than copper.

In a half equation, why is it necessary to add electrons?

• To make the equation more complex.

• To balance the charges on both sides.

• To increase the mass of the equation.

• To change the state of the reactants.

Where should electrons be added in the half equation for magnesium?

• On the left-hand side.

• On the right-hand side.

• In the middle of the equation.

• They should not be added.

What must be ensured before combining half equations into an ionic equation?

• The equations must have the same number of atoms.

• The electrons on both sides must be balanced.

• The equations must have the same reactants.

• The equations must be in the same phase.

What is the color change observed when copper sulfate solution reacts with magnesium?

• Blue to green.

• Blue to colorless.

• Colorless to blue.

• Green to blue.

What is the color of the precipitate formed when copper metal is produced?

• Brown

• Black

• Red

• White

What happens to magnesium powder during the reaction?

• It remains unchanged.

• It changes color.

• It dissolves in the solution.

• It forms a solid precipitate.

Which ion acts as the oxidizing agent in the reaction?

• Hydrogen ion

• Sulfate ion

• Copper ion

• Magnesium ion

What is the change in oxidation number for copper ion during the reaction?

• From 0 to +1

• From +1 to 0

• From 0 to +2

• From +2 to 0

Which element acts as the reducing agent in the reaction?

• Oxygen

• Copper

• Magnesium

• Sulfate