Natural Sciences and Technology Grade 6-A - Thunderbolt Kids
Natural Sciences and Technology Grade 6-A - Thunderbolt Kids Natural Sciences and Technology Grade 6-A - Thunderbolt Kids
VISIT Copper sulfate crystal time lapse. goo.gl/7lL35 4. Pour some food colouring into your saturated solution to give the crystals a colour. 5. Pour your solution into the clear glass jar. If you have undissolved sugar at the bottom of your container, avoid getting it in the jar. 6. Place your sting inside the glass jar. 7. Place your jar where it will not be disturbed and check on your string each day and observe the crystal growth. 8. Allow the crystals to grow until they have reached a size that you desire, or until they have stopped growing. You can pull the string out and allow the crystals to dry. You can eat them or keep them! QUESTIONS: 1. How long did it take for crystals to start forming on the string? 2. What are the crystals made of? 3. Why do you think we boiled the water when dissolving the sugar in the solution? An example of crystals in nature Have you ever visited a cave? Inside, you may have seen crystal formations called stalactites and stalagmites. Stalactites and stalagmites form inside limestone caves. Stalactites hang down like icicles and stalagmites grow from the floor of the cave upwards. Stalactites and stalagmites always occur in pairs. Caves form when water slowly dissolves the limestone underground. The 148 Matter and Materials
dissolved limestone can crystallise again when the water evaporates. This is also aslow process and it happens when water drips down from the ceiling of the cave over a long period of time. The water drops that land on the floor of the cave also evaporate over time and when they land on the same spot, astalagmite will grow on that spot. Over many thousands of years, the stalactite and stalagmite may connect up to become a column. Stalactites and stalagmites forming in a cave. Insoluble substances Cango Caves in Oudtshoorn in South Africa. We have a word for substances that do NOT form solutions when they are mixed with water. These substances are called insoluble substances. QUESTIONS Can you remember what substances are called that DO form solutions when they are mixed with water? Write the term below. Some substances that are insoluble in water may be soluble in other solvents! Think about this for a moment: Is nail polish soluble in water? No, of course not, or it would be possible to wash it o! What would be agood solvent for nail polish? Chapter 3. Solutions as special mixtures NEW WORDS • insoluble substance 149
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dissolved limestone can crystallise again when the water<br />
evaporates. This is also aslow process <strong>and</strong> it happens when water<br />
drips down from the ceiling of the cave over a long period of time.<br />
The water drops that l<strong>and</strong> on the floor of the cave also evaporate<br />
over time <strong>and</strong> when they l<strong>and</strong> on the same spot, astalagmite will<br />
grow on that spot. Over many thous<strong>and</strong>s of years, the stalactite<br />
<strong>and</strong> stalagmite may connect up to become a column.<br />
Stalactites <strong>and</strong> stalagmites forming<br />
in a cave.<br />
Insoluble substances<br />
Cango Caves in Oudtshoorn in<br />
South Africa.<br />
We have a word for substances that do NOT form solutions when<br />
they are mixed with water. These substances are called insoluble<br />
substances.<br />
QUESTIONS<br />
Can you remember what substances are called that DO form<br />
solutions when they are mixed with water? Write the term<br />
below.<br />
Some substances that are insoluble in water may be soluble in<br />
other solvents! Think about this for a moment: Is nail polish soluble<br />
in water? No, of course not, or it would be possible to wash it o!<br />
What would be agood solvent for nail polish?<br />
Chapter 3. Solutions as special mixtures<br />
NEW WORDS<br />
• insoluble<br />
substance<br />
149
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