Thames & Kosmos Barbie Fundamental Chemistry Set: Chemistry Fun for Everyone handleiding

Niet gecategoriseerd

Thames & Kosmos

32 pagina's

PDF beschikbaar

Handleiding

Put the puy in the test tube and

place the test tube in a pot of

hot water. Have an adult help you

heat the water safely. Be careful

not to burn yourself. Observe the

slime for a period of ﬁve to ten

minutes. What do you notice?

Remove the test tube from the

hot water, wipe it dry, and place

it into the holder. Let the slime

cool down to room temperature.

What happens when the slime

has cooled down?

6 7

A material that changes color due to a change in

temperature is called thermochromic. A thermochromic

material changes color because when it is heated the way that

its molecules absorb and release light changes. This process is

reversible because it does not involve a change in the structure of

the molecules in the material. This type of change is called a physical

change. A classic example of a thermochromic material is a mood ring

which changes color in response to the wearer’s body heat. There

are two common groups of thermochromic materials: liquid crystals

and leuco dyes. As the name suggests, liquid crystals are materials

that are in a state between a liquid and a crystal solid. A common use

for liquid crystals is in liquid crystal displays

(LCDs), which are used in TVs and computer

monitors. Leuco dyes are chemicals that can

switch between two diﬀerent forms, one of

which is colorless, depending on exposure to

light, heat, or pH.

WHAT’S

HAPPENING?

Mood ring

LCD screen

Safety

Note:

Caution! High

temperatures.

There is a risk

of burns. Adult

supervision is

required.

Bekijk gratis de handleiding van Thames & Kosmos Barbie Fundamental Chemistry Set: Chemistry Fun for Everyone, stel vragen en lees de antwoorden op veelvoorkomende problemen, of gebruik onze assistent om sneller informatie in de handleiding te vinden of uitleg te krijgen over specifieke functies.