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
Mixture Sugar and water Yes Salt and water Sand and water Oil and water Vinegar and water Copper sulfate and water Is the mixture a solution after stirring? (Yes or No) In the activity above, we mixed dierent substances with water. 1. Which substance is the solvent in all the mixtures? 2. From the mixtures above, choose an example of asolution that consists of a solid solute and a liquid solvent. 3. From the mixtures above, choose an example of asolution that consists of a liquid solute and a liquid solvent. 4. From the mixtures above, choose an example of a mixture of two liquids that is NOT a solution. 138 Matter and Materials
Wait! How is it possible for one substance to 'disappear' into another? Good question Tom. We know that science is not magic, and that it is not possible for something to disappear! How do we explain the observation that one substance (the solute) 'disappears' into the other (the solvent)? In the next activity we will look more closely at a solution, in order to understand how it is possible for the solute to look as if it disappears into the solvent. ACTIVITY: What is asolution? MATERIALS: • copper sulfate crystals • tap water • clear container, such as aglass beaker or test tube (a water glass will also do) • plastic spoon for scooping and stirring INSTRUCTIONS: 1. Look at the copper sulfate crystals and the water. Write one sentence to describe each substance in the table below. 2. Mix one small scoop of the copper sulfate with enough water to dissolve it completely (half acup of water should be enough). Let it stand for a few minutes until it clears. Chapter 3. Solutions as special mixtures 139
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Wait! How is it possible for<br />
one substance to 'disappear'<br />
into another?<br />
Good question Tom. We know that science is not magic, <strong>and</strong> that it<br />
is not possible for something to disappear!<br />
How do we explain the observation that one substance (the solute)<br />
'disappears' into the other (the solvent)?<br />
In the next activity we will look more closely at a solution, in order<br />
to underst<strong>and</strong> how it is possible for the solute to look as if it<br />
disappears into the solvent.<br />
ACTIVITY: What is asolution?<br />
MATERIALS:<br />
• copper sulfate crystals<br />
• tap water<br />
• clear container, such as aglass beaker or test tube (a water<br />
glass will also do)<br />
• plastic spoon for scooping <strong>and</strong> stirring<br />
INSTRUCTIONS:<br />
1. Look at the copper sulfate crystals <strong>and</strong> the water. Write one<br />
sentence to describe each substance in the table below.<br />
2. Mix one small scoop of the copper sulfate with enough water<br />
to dissolve it completely (half acup of water should be<br />
enough). Let it st<strong>and</strong> for a few minutes until it clears.<br />
Chapter 3. Solutions as special mixtures<br />
139
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