Metallic elements Starter-quiz

What is a pure substance that consists of only one kind of atom called?

• Element

• Mixture

• Compound

• Molecule

Answer explanation

An element is defined as a pure substance consisting of only one type of atom. The other options, such as molecule, compound, and mixture, refer to combinations of different atoms or substances, making 'type' the correct choice.

Which of the following are physical properties of substances? Tick 3 correct answers.

• melting and boiling points

• making new substances when added to water

• conducting electricity

• reacting with oxygen

• being shiny

Answer explanation

Melting and boiling points, conducting electricity, and being shiny are physical properties. They describe the state and behavior of a substance without changing its chemical identity, unlike the other options which involve chemical reactions.

Match the physical property with its description. Write the correct letter in each box.

• breaks up easily

• Electrical conductor

• allows a flow of charge

• Shiny

• able to reflect light

• Dull

• unable to reflect light

• Thermal conductor

• able to transfer heat from one place to another

• Brittle

Which of the following is a pure substance? Tick 1 correct answer.

• Fresh orange juice

• orange squash

• distilled water

• milk

When sodium metal is added to chlorine gas a yellow-orange flame and white solid form. Select what had happened and why. Tick 3 correct answers.

• A physical change

• A chemical change

• A new substance has formed

• The same substances are present

• Sodium and chlorine have reacted

Answer explanation

When sodium reacts with chlorine, a chemical change occurs, resulting in the formation of a new substance, sodium chloride. The reaction is evidenced by the yellow-orange flame and the production of a white solid.

Use the periodic table provided to match the names of the elements with their symbols. Write the correct letter in each box.

• Ag

• Silver

• Ar

• Argon

• Ti

• Strontium

• Sr

• Titanium

• Sn

• Tin