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
DID YOU KNOW? Water purification tablets can be used in emergencies such as a flood or earthquake when you do not have access to clean water. The tablets remove microscopic impurities and chemicals that could harm you. How can water be cleaned? Imagine you are in aplace without clean water. The only water around is amuddy stream. How can the dirty water be made clean enough to drink? When thinking about how to purify water, we need to consider what it is that we need to do to separate the contaminating particles from the water. The muddy water is actually amixture of sand and water, and possibly other contaminants. QUESTIONS 1. Do you remember in the beginning of the term we looked at dierent ways to separate out mixtures? What are some of these ways? 2. Which methods do you think would be useful to separate the large impurities from the dirty water? 3. Which methods would be useful to remove the soluble impurities from the dirty water? Let's investigate some dierent ways to clean water at home or at school. 190 Matter and Materials
ACTIVITY: Cleaning water in astill MATERIALS: • clean, dry small pot/container • muddy water • big, deep cooking pot • ruler • 1 marble or clean stone • plastic cling wrap INSTRUCTIONS: 1. Pour the muddy water into the big pot until it is about 5 cm deep (you can use the ruler to measure the depth of the water). 2. Place the smaller pot/container inside the bigger pot. 3. Cover the bigger pot with plastic cling wrap. 4. Place a marble or stone in the middle of the plastic wrap so that it is above the small pot/container inside the pot. You have now made astill for purifying water. 5. Leave the still out in the sun for a day. 6. Look carefully at the still and answer the questions below. 7. If you have a phone with acamera, you could take pictures of the still and show them to your class. QUESTIONS: 1. What do you notice about the inside of the smaller container? Is it wet or dry? 2. What do you notice about the cling wrap? Is it wet or dry? Chapter 6. Processes to purify water 191
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- Page 185 and 186: ACTIVITY: Thinking about pollution
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- Page 193 and 194: QUESTIONS Do you remember studying
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ACTIVITY: Cleaning water in astill<br />
MATERIALS:<br />
• clean, dry small pot/container<br />
• muddy water<br />
• big, deep cooking pot<br />
• ruler<br />
• 1 marble or clean stone<br />
• plastic cling wrap<br />
INSTRUCTIONS:<br />
1. Pour the muddy water into the big pot until it is about 5 cm<br />
deep (you can use the ruler to measure the depth of the<br />
water).<br />
2. Place the smaller pot/container inside the bigger pot.<br />
3. Cover the bigger pot with plastic cling wrap.<br />
4. Place a marble or stone in the middle of the plastic wrap so<br />
that it is above the small pot/container inside the pot. You<br />
have now made astill for purifying water.<br />
5. Leave the still out in the sun for a day.<br />
6. Look carefully at the still <strong>and</strong> answer the questions below.<br />
7. If you have a phone with acamera, you could take pictures of<br />
the still <strong>and</strong> show them to your class.<br />
QUESTIONS:<br />
1. What do you notice about the inside of the smaller container?<br />
Is it wet or dry?<br />
2. What do you notice about the cling wrap? Is it wet or dry?<br />
Chapter 6. Processes to purify water<br />
191
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