Thames & Kosmos Kids First: Crystals, Rocks & Minerals handleiding

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Thames & Kosmos

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Handleiding

Your experiment area …

… should be set up in a quiet room. If there are any young

children or pets in the house, the room should be lockable

so they can’t get to the chemicals or knock over your

crystal-growing jars. Also, the temperature in the room

shouldn’t fluctuate too much (no full sun through the

windows, for example), since the solubility of the

substances is temperature-dependent and unwanted

heating can cause already-formed crystals to dissolve

again.

The kitchen is not appropriate for your experiments, since

there is too great a risk that chemicals will get into foods

or that someone will inadvertently swallow these

substances by mistaking them for food. In addition, the

kitchen temperature will vary a lot during the course of a

day, especially when someone is cooking.

A cool, quiet, and lockable basement room is much more

suitable. And don’t forget to clean up after your

experiments and to wipe the work surface clean.

The chemical vials hold the hazardous substances.

The illustration shows how to open the safety lids using

the lid opener (part no. 070177) provided with the kit.

Sometimes when you open them, a little of the chemical

gets stuck to the lid and can fall onto your hand or the

work surface. You can prevent that by banging the vial a

few times on the work surface before opening it. After you

have taken what you need from the vial, close it again

immediately.

Opening and closing the safety lids

sometimes requires quite a bit of strength.

If necessary, have an adult help you.

Ask an adult to help you open the plaster packet and the

chemical packets with a pair of scissors; never with your

teeth! Don’t cut it in such a way that the label is lost.

The alum packet should be completely used up during the

experiment. Close the plaster bag immediately after use

with a clip or a piece of tape, and keep it in a safe place.

When you want to add liquids drop by drop, the pipette

will come in handy: Squeeze the upper part of the pipette

between thumb and forefinger and dip the end into the

liquid (image, step 1). As soon as you release pressure on

the bulb, the liquid rises into the pipette (step 2). Then, you

can gradually let the liquid out drop by drop by applying

careful pressure to the bulb (step 3).

When working with open flame, be sure there are no

flammable objects, such as curtains, nearby. Be careful

not to let loose sleeves, scarves, or your hair get into the

flame. Tie up your hair. Keep a bucket of sand or fire

extinguisher ready for extinguishing fire. Place lit candles

on heat-resistant surfaces only.

Tips

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