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
5. Once you have recorded your observation, you can empty the yoghurt tub. 6. Repeat steps 1-4until you have tested all the substances on the list. Substance It looks as though none of the substance has disappeared Observations sugar X salt sand oil vinegar copper sulfate It looks as if all or most of the substance has disappeared QUESTIONS: 1. Which of the substances seemed to disappear when they were mixed with the water? 2. Which of the substances in this activity did NOT form solutions with water? (Hint: which ones did not look as if they 'disappeared' into the water?) 136 Matter and Materials
What is asolution? When two substances make a solution, it will look as if the one substance has disappeared into the other. • The substance that looks as ifit has disappeared is called the solute. • The substance that we can still see is called the solvent. • The solvent and solute together are called the solution. QUESTIONS Is sugar and sand a solution? (You may want to page back to Part 3 of the activity Mixing solids to remind yourself.) ACTIVITY: Which mixtures are solutions? In this activity we will use our observations from the previous activity (When is amixture also asolution?) to decide which of the mixtures we made were solutions. QUESTIONS: In the activity When is amixture also asolution?, we mixed dierent substances with water. We saw that some of the substances looked as if they had disappeared in the water. 1. What name do we give to the substance that looks as if it has disappeared? 2. What name do we give to the substance that we can still see? 3. What name do we give to these mixtures? Complete the table using the information about the sugar -water mixture as an example. Chapter 3. Solutions as special mixtures 137
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5. Once you have recorded your observation, you can empty the<br />
yoghurt tub.<br />
6. Repeat steps 1-4until you have tested all the substances on<br />
the list.<br />
Substance<br />
It looks as though<br />
none of the<br />
substance has<br />
disappeared<br />
Observations<br />
sugar X<br />
salt<br />
s<strong>and</strong><br />
oil<br />
vinegar<br />
copper sulfate<br />
It looks as if all or<br />
most of the<br />
substance has<br />
disappeared<br />
QUESTIONS:<br />
1. Which of the substances seemed to disappear when they<br />
were mixed with the water?<br />
2. Which of the substances in this activity did NOT form<br />
solutions with water? (Hint: which ones did not look as if they<br />
'disappeared' into the water?)<br />
136 Matter <strong>and</strong> Materials
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