Level 9 Chemistry Pre-Test

What is the law that states mass is neither created nor destroyed during a chemical reaction?

• Law of Conservation of Energy

• Law of Conservation of Mass

• Law of Thermodynamics

• Law of Chemical Equilibrium

Which of the following is an example of a chemical reaction?

• Melting of ice

• Rusting of iron

• Boiling of water

• Breaking a glass

In a chemical reaction, what happens to the atoms of the reactants?

• They are destroyed

• They are rearranged to form new substances

• They disappear

• They remain unchanged

Which of the following reactions involves energy transfer?

• Dissolving sugar in water

• Combustion of petrol

• Mixing sand and salt

• Melting butter

• Decomposition

• Combustion

• Synthesis

• Displacement

Which of the following is a product of the combustion of hydrocarbons?

• Oxygen

• Carbon dioxide

• Nitrogen

• Hydrogen

What is the main energy change that occurs during an exothermic reaction?

• Energy is absorbed

• Energy is released

• Energy remains constant

• Energy is destroyed

Which of the following is a characteristic of an acid?

• Bitter taste

• Slippery feel

• Sour taste

• Sweet taste

What is the pH range of acidic solutions?

• 0 to 7

• 7 to 14

• Exactly 7

• 0 to 14

Which of the following is a common use of acids in living systems?

• Neutralising bases

• Providing energy

• Digesting food

• Building proteins