What do we use plant oils for?

Make up

Food

Fuel

Medicine

Lubricants

Paints

Foam

Toothpaste Soaps

Henna which makes henna oil – used as a medicine

What does solubility

mean?

Do oils dissolve

in water?

How easily a substance

dissolves

NO

Eucalyptus tree which makes eucalyptus oil – Used in cough medicine

Ylang-ylang which makes ylang-ylang oil – Used as an antiseptic

EMULSIONWhat is the substance

called when oil and water

are combined?

What is diffusion?

Means by which gaseous particles move through the

air

The movement of particles from an area of low

concentration to an area of low concentration

Rose which makes rose oil – Used as a fragrance

Mentha arvensis which makes mint oil – Used in toothpaste

Why do flowers

smell nice?

To attract pollinators Plants need to attract

insects, bats and hummingbirds to transfer

the pollen and create fertile seeds

Spruce trees which make spruce oil – This is useful for improving breathing conditions

What is meant by the term volatile?

If a liquid evaporates

easily

Iris This is used in fragrances

Why do we like

the smell of

flowers?

That's got to do with our sense of smell. This is the sense that makes us aware of the

chemicals in our environment, and the brain marks them as good or bad smells.

Chemicals that are bad for us (like ammonia or hydrogen sulphide) smell bad, so we avoid

them. Chemicals that are good for us (like the natural chemicals of food) smell nice.

That's why we walk away from a gutter and walk towards a nice smelling cup of coffee!

Our brains treat the smells from flowers and fruits as attractive, because it often implies

that there is good food to be found with them.

Cymbopogan which makes citronella oil – This is useful for repelling mosquitoes

What is the process called when we to extract plant oils?

Distillation

Tea tree oil – extracted from Melaleuca alternifolia This is used in medicines