Year 8 Science: Atoms, Elements, and Compounds

Flashcards covering key concepts about atoms, elements, compounds, and chemical reactions for Year 8 science.

What is an atom?

The smallest particle of an element.

What is the difference between a chemical change and a physical change?

A chemical change forms new substances, while a physical change does not form new substances.

What does the conservation of mass state?

The total mass remains the same before and after a chemical reaction.

What is a compound?

A pure substance made up of two or more elements strongly joined together.

What is a mixture?

A combination of two or more pure substances whose properties differ from the individual substances.

What symbolizes elements in the periodic table?

One or two letter symbols, where the first letter is capital and the second letter is lower case.

What is a reactant?

A substance that is used up in a chemical reaction.

What is a product in a chemical reaction?

A substance that is formed in a chemical reaction.

What does a word equation represent?

It shows what happens in a chemical reaction, indicating reactants and products.

What defines an element?

A substance made up of only one type of atom.