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
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In the first investigation, we will explore whether salt dissolves<br />
faster in hot or cold water. What do you expect?<br />
INVESTIGATION: Does salt dissolve faster in hot or cold<br />
water?<br />
AIM:<br />
MATERIALS AND APPARATUS:<br />
• 3 clear containers (glass beakers are ideal, but small yoghurt<br />
tubs will also be suitable)<br />
• table salt<br />
• very hot water (not boiling)<br />
• tap water (at room temperature)<br />
• ice water<br />
• teaspoon<br />
• stopwatch or clock with second h<strong>and</strong><br />
METHOD:<br />
1. Measure the same quantity (100 ml) of tap water, hot water<br />
<strong>and</strong> ice water respectively into the three containers. Look at<br />
the diagram of the setup.<br />
2. Place one teaspoon (5 ml) of salt into the container with the<br />
hot water.<br />
3. Stir the solution by moving the teaspoon once back <strong>and</strong> forth<br />
through the water.<br />
4. Measure the time it takes for the salt to dissolve completely.<br />
Record the time in the table below.<br />
5. Repeat steps 3-5 with the tap water <strong>and</strong> record the time it<br />
takes for the salt to dissolve in the table.<br />
6. Repeat steps 3-5 with the ice water, <strong>and</strong> record the time it<br />
takes for the salt to dissolve in the table.<br />
Chapter 4. Dissolving<br />
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