Chemical Reactions and Earth_KS3_Y8Science Quiz

What is the left part of a chemical equation called?

C + O₂ --> CO₂

• Products

• Chemical Equation

• Yields

• Reactants

What is the right part of a chemical equation called?

C + O₂ --> CO₂

• Yields

• Chemical Equation

• Products

• Products

How many atoms of carbon (C) are in C₆H₁₂O₆?

• 24

• 12

• 3

• 6

What is the chemical formula for hydrochloric acid?

• HCl

• H₂SO4

• NaOH

• CO₂

What is formed when an acid reacts with a metal?

• Salt and water

• Salt and hydrogen gas

• Oxygen gas

• Carbon dioxide

The pH scale measures:

• Temperature

• Acidity or alkalinity

• Density

• Volume

Chemical reactions involve the:

• Creation of new atoms

• Movement of atoms

• Destruction of atoms

• Repositioning of atoms

Combustion is a type of chemical reaction that involves:

• Cooling down of substances

• Formation of new substances

• Separation of substances

• No change in substances

Magnesium can be burned in air to produce solid magnesium oxide.

What is the correct balanced equation?

• 2Mg _(s) + CO_{2 (g)} → 2MgO _(s) + C _(s)

• Mg _(s) + O _(g) → MgO _(s)

• 2Mg _(s) + O_{2 (g)}→ 2MgO _(s)

• Mg _(s) + O_{2 (g)} --> MgO _(s)

An indicator is used to:

• Speed up chemical reactions

• Determine the temperature of a reaction

• Measure the pH of a solution

• Create new substances