Chemistry Remedial Test

Look at the diagram. It shows part of the Periodic Table. Which element has the electronic structure 2.8.4?

• Silicon (Si)
• Carbon (C)
• Oxygen (O)
• Neon (Ne)

Look at the diagram. It shows part of the Periodic Table. Which element is in the same group as Be?

• Lithium (Li)

• Berylium (Be)

• Sodium (Na)

• Magnesium (Mg)

Hydrogen and oxygen react together to make molecules of water. Write down the type of bonding in a water molecule.

• Ionic bonding
• Metallic bonding
• Van der Waals bonding
• Covalent bonding

Carlos heats water in a cooking pan. What is the name of the thermal energy transfer process shown

by the arrows on the diagram?

• Conduction
• Convection
• Insulation
• Radiation

Carlos puts a lid on his cooking pan. The water in the cooking pan heats up faster. Explain why by using the particle idea.

Blessy investigates the displacement reactions of four metals. The metals are copper, magnesium, zinc, and iron. She puts the metals into solutions of metal salts and identifies if there is a reaction. Write down the word equation for the reaction of zinc and copper sulfate

Blessy investigates the displacement reactions of four metals. The metals are copper, magnesium, zinc, and iron. She puts the metals into solutions of metal salts and identifies if there is a reaction. Blessy got a solution of magnesium sulfate from the reaction. Explain how Blessy able to make a dry sample of magnesium sulfate.

What gas is produced when magnesium react with dilute hydrochloric acid?

• Oxygen

• Hydrogen

• Carbondioxide

• Nitrogen

Blessy wants to make a metal salt by reacting zinc with sulphuric acid. What safety hazard that could arise from this experiment?

Blessy wants to make a metal salt by reacting zinc with sulphuric acid. What should Blessy do to control the hazard?