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
A solution of water and sugar molecules (particles). Look carefully at the picture and then answer the following questions. QUESTIONS: 1. Why is the sugar no longer visible? Give a reason. 2. How can we be sure the sugar has not "disappeared" and that it is still there? 3. How is the picture of the sugar and water mixture dierent from the picture of the liquid which is shown below? 158 Matter and Materials
4. What do we call it when we have two or more substances combined? 5. Can we say that the sugar melts? Give a reason. 4.2 Rates of dissolving The rate of dissolving refers to how quickly asolute dissolves in a solvent. The word "rate" has many meanings. In science, when we use the word "rate" we usually mean how fast or how slow. Tom likes his coee sweet, with 3teaspoons of sugar. For the coee to taste sweet, the sugar must be dissolved. Here is a picture of acup of coee. Answer the questions that follow. A cup of coee. Chapter 4. Dissolving 1 NEW WORDS • temperature • grain size • variable • rate 159
- Page 117 and 118: We would see that the particles in
- Page 119 and 120: 3. If you should come into contact,
- Page 121 and 122: In the next table there are 3 pictu
- Page 123 and 124: 2. Did they behave dierently? 3. In
- Page 125 and 126: 7. What do we call the process when
- Page 127 and 128: We have learnt that materials exist
- Page 129 and 130: A mixture of dierent coloured jelly
- Page 131 and 132: 3. Separate the mixture into a pile
- Page 133 and 134: 2. Draw a picture of the mixture. 3
- Page 135 and 136: 3. Can you separate the mixture int
- Page 137 and 138: INSTRUCTIONS: 1. Place 10 scoops of
- Page 139 and 140: Picture of mixture INSTRUCTIONS (Pa
- Page 141 and 142: REVISION: 1. What is amixture? 2. L
- Page 143 and 144: Now that we know more about mixture
- Page 145 and 146: ACTIVITY: When is amixture also aso
- Page 147 and 148: What is asolution? When two substan
- Page 149 and 150: Wait! How is it possible for one su
- Page 151 and 152: 4. What do you think happened to th
- Page 153 and 154: In the previous chapter, we saw how
- Page 155 and 156: 4. Which method do you think works
- Page 157 and 158: 3. Complete the following sentences
- Page 159 and 160: dissolved limestone can crystallise
- Page 161 and 162: KEY CONCEPTS • A solution is aspe
- Page 163 and 164: 4. What was the mixture of sugar an
- Page 165 and 166: It was quite dicult in the beginnin
- Page 167: changes are called. QUESTIONS: 1. W
- Page 171 and 172: In the first investigation, we will
- Page 173 and 174: 3. What did we change in this inves
- Page 175 and 176: RESULTS: The eect of grain size on
- Page 177 and 178: INVESTIGATION: Does stirring increa
- Page 179 and 180: 3. What did we change in this inves
- Page 181 and 182: REVISION: 1. What are the 3factors
- Page 183 and 184: We have learnt a lot about solution
- Page 185 and 186: ACTIVITY: Thinking about pollution
- Page 187 and 188: 8. How do you think oil ends up in
- Page 189 and 190: Wetlands are not necessarily wet th
- Page 191 and 192: INSTRUCTIONS: 1. Drill ahole in the
- Page 193 and 194: QUESTIONS Do you remember studying
- Page 195 and 196: REVISION: 1. Look at the picture be
- Page 197 and 198: Water is very important for us and
- Page 199 and 200: QUESTIONS 1. What does 'clean water
- Page 201 and 202: ACTIVITY: Cleaning water in astill
- Page 203 and 204: Filtering is agood way of removing
- Page 205 and 206: 2. What size and shape will your fi
- Page 207 and 208: MAKE: Now that you have a design, i
- Page 209 and 210: How is water cleaned by municipalit
- Page 211 and 212: STEP 3: AERATION The raw water now
- Page 213 and 214: 6. Name the 5steps in the water tre
4. What do we call it when we have two or more substances<br />
combined?<br />
5. Can we say that the sugar melts? Give a reason.<br />
4.2 Rates of dissolving<br />
The rate of dissolving refers to how quickly asolute dissolves in a<br />
solvent. The word "rate" has many meanings. In science, when we<br />
use the word "rate" we usually mean how fast or how slow.<br />
Tom likes his coee sweet, with 3teaspoons of sugar. For the<br />
coee to taste sweet, the sugar must be dissolved. Here is a<br />
picture of acup of coee. Answer the questions that follow.<br />
A cup of coee.<br />
Chapter 4. Dissolving<br />
1<br />
NEW WORDS<br />
• temperature<br />
• grain size<br />
• variable<br />
• rate<br />
159
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