safe in the sun - croda science · safe in the sun the sun produces lots of different types of...

Safe in the Sun

Why is Sun Screen

Important?

Safe in the Sun

▪ The sun produces lots of different types of rays,

some you can see and some you can't

▪ It is some of those you can't see that do the

damage

Sun Screen

▪ A bottle of sun cream does not contain just one

substance.

▪ It is a mixture of lots of ingredients, each doing

an important job.

▪ One of the main ingredients has the job of

stopping too much harmful ultraviolet from

reaching the skin.

▪ But, there's problem!

Lumps or Powder?

Roles & Responsibilities

▪ Administrator keeps a written and pictorial

record for the group

▪ Resource Manager collects, sets up and

returns all equipment used by the group

▪ Communications Officer collects the group’s

ideas and reports back to the rest of the class.

▪ Health and Safety Manager takes

responsibility for the safety of the group, making

sure everyone is working sensibly with the

equipment

▪ Personnel Manager takes responsibility for

resolving disputes within the group and

ensuring the team works together

You will need

▪ 4 plastic cups of different types of sugar (this

will represent the suncream active)

▪ Cubes

▪ Caster

▪ Granulated

▪ Icing

▪ 4 plastic measuring cups with red lids

▪ 4 plastic spoons

▪ 1 timer

Which of the sugars is spread most evenly

throughout the oil?

PlanningWe are investigating

We will

change…

(independent)

We will

measure/observe

(dependent)

We will keep the same

Our question is….

Amount

of oil?? ??

?? ?? ??

How

quickly the

sugar

sinks

??

?? ??

??

??

?? ??

?? ?? ??

Which sugar is most dispersed?

PlanningWe are investigating

We will

change…

(independent)

We will

measure/observe

(dependent)

We will keep the same

Our question is….

Amount

of oilType of

sugar

Type of

oil

Amount

of sugar

?? ??

How

quickly the

sugar

sinks

??

?? ??

??

??

Type of

sugar

How

quickly the

sugar

sinks

Amount

of oil

Type of

oilAmount

of sugar

We could change… We could measure/observe…

Which sugar is most dispersed?

Lumps or Powder?

▪ Which product do you find was spread most

easily in the oil?

▪ When this main ingredient arrives from the

factory where it is made it comes as large

lumps.

▪ To make the sun cream, however, this needs to

be a powder, like this photograph shows

Grinding Solids

▪ GRANT

Grinding Solids

▪ As we know, the sun screen active ingredient

arrives in lumps and needs to be ground into a

powder

▪ Can you find the best material to grind up sugar

lumps into powder?

▪ How can we make it a fair test?

You will need

▪ Marbles

▪ Ball bearings

▪ Smarties / beans

▪ 3 pots with lids

▪ 3 sugar cubes

▪ Weighing scales (shared between the class)

Question?

▪ What did you find was the best way to break the

lumps into powder?

Testing Sunscreens

Testing Sunscreens

You will need

▪ UV beads

▪ Small samples of sunscreen A, B and C

▪ Tray

▪ 3 Plastic cups

▪ Teaspoon

▪ Pipette

Product ProtectionCan you think of other products that might have

sun protection in them?

We hope you enjoyed our visit!

Perhaps one day you would like to be a

scientist too?!

Thank you!