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

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Thames & Kosmos

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Pour the base

powder into the

second test tube.

(You can add a drop

of dye to the solution

as well.) Stir to mix.

Pour the solution

from test tube 2 into

test tube 1. Watch

what happens.

The acid and base powders are solids in the form of

small particles. A solid is a state of maer that is rigid,

holds its shape, and doesn’t ﬂow like a liquid. Even though

the powders appear to pour and take the shape of their

containers, the individual particles of the powder hold their

shape, and are thus considered solids.

When you add the powders to the water, you create

an acidic solution in the ﬁrst test tube and a basic solution

in the second. The solids are dissolved into the water, which

is a liquid. A liquid is a state of maer that ﬂows and takes

the shape of the container it is in, ﬁlling the boom ﬁrst.

When you mix the acidic and basic solutions together, a

chemical reaction occurs — the product of which is a gas.

A gas is a state of maer that ﬂows and expands to ﬁll the

entire container it is in. The gas forms in the liquid solution as

bubbles, which rise up out of the solution and escape into the air.

The acid is citric acid and the base is sodium hydrogen

carbonate. When these mix, they react to form water, carbon

dioxide gas (the bubbles!), and sodium citrate. This reaction is

similar to how baking powder reacts to form bubbles that cause

cookies and cakes to rise!

WHAT’S

HAPPENING?

DO NOT

DRINK!

Solid

Liquid

Gas

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