Atoms. elemnts and compounds

Atom

Smallest part of an element. All substances are made up of atoms.

Compounds are formed from elements by …… …….. .

chemical reactions.

Define an element:

A substance made up of one kind of atom.

Define a compound

2 elements chemically bonded together.

Mixture

Consists of two or more elements NOT chemically combined.

Two gases which make up the earth’s atmosphere?

• 80% nitrogen

• 20% oxygen

An example of a greenhouse gas, which is responsible for climate change?

Carbon dioxide

Decomposition

Breakdown into something smaller.

Metal characteristics:

• Malleable

• and ductile

• Shiny

• Hard

• Conducts electricity

How can mixtures be separated if they are NOT CHEMICALLY COMBINED?

Physical processes

Non-metals characteristics (dwab)

• Dull, weak and brittle.

• Poor conductors of heat and electricity

How do elements make compounds?

Chemically bonded (joined) together

Where was carbon dioxide coming from?

Volcanic activity 🌋

Why did the amount of oxygen increase?

• The algae and green oranges evolved 🪴

• which allowed photosynthesis to take place ☀

Why did the amount of carbon dioxide decrease?

Plants took in carbon dioxide and got trapped underneath the ground.