Year 8 Science Chemistry Pre-Test Quiz (1)

Which of the following is an element?

• Water

• Oxygen

• Carbon dioxide

• Salt

What is the smallest unit of an element that retains the properties of that element?

• Molecule

• Atom

• Compound

• Mixture

Which of the following is a compound?

• Hydrogen

• Helium

• Water

• Oxygen

Tags

NGSS.MS-PS1-1

In the periodic table, elements are arranged in order of increasing:

• Atomic number

• Atomic mass

• Density

• Reactivity

Which of the following pairs of elements can form a compound?

• Sodium and Chlorine

• Helium and Neon

• Argon and Krypton

• Nitrogen and Oxygen

Tags

NGSS.MS-PS1-1

Which of the following is a sign of a chemical reaction?

• Change in colour

• Melting of ice

• Dissolving sugar in water

• Breaking a glass

Tags

NGSS.MS-PS1-2

Which of the following is a chemical change?

• Boiling water

• Rusting of iron

• Cutting paper

• Freezing water

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is a physical change?

• Burning wood

• Baking a cake

• Melting ice

• Digesting food

Tags

NGSS.MS-PS1-4

What is a mixture?

• A substance made of two or more elements chemically combined

• A substance made of two or more elements physically combined

• A pure substance

• An element

Which of the following is an example of a mixture?

• Water

• Carbon dioxide

• Air

• Sodium chloride