Grade 8 Integrated Science Quiz

Which of the following best describes an element?

• A substance made of different kinds of atoms.

• A substance that can be separated into simpler substances.

• A pure substance made up of only one type of atom.

• A combination of atoms from two or more elements.

What is the difference between an atom and a molecule?

• An atom is a combination of molecules.

• A molecule is the smallest unit of an element.

• A molecule consists of two or more atoms chemically bonded.

• An atom is always bigger than a molecule.

Which of the following is a correct chemical symbol for an element?

• Co for Carbon

• Al for Aluminium

• Ag for Argon

• Pb for Phosphorus

The reaction between sodium and chlorine forms:

• Sodium chloride

• Sodium hydroxide

• Chlorine gas

• Sodium carbonate

Why are chemical symbols important in science?

• They make writing chemical names easier and clearer.

• They help identify only metallic elements.

• They allow scientists to avoid using numbers.

• They ensure all elements react in the same way.

Which of these is NOT a compound?

• Water

• Oxygen

• Carbon dioxide

• Sodium chloride

The formula H₂O represents:

• An atom

• A mixture

• A compound

• A metal

Which of the following elements is used in making electrical wires?

• Aluminium

• Silver

• Copper

• Lead

What is the chemical symbol for copper?

• Co

• Cu

• Pb

• None of the above

Which of these compounds is correctly matched with its use?

• Carbon dioxide – Used in making electrical wires

• Water – Used in chemical reactions and body processes

• Aluminium oxide – Used as a nutrient in food

• Sodium chloride – Used in construction of buildings