Natural Sciences and Technology Grade 6-A - Thunderbolt Kids

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What have we learnt about solutions as special mixtures? Soluble substances dissolve in water and insoluble substances do not dissolve in water. Water is not the only solvent. Some substances which are not soluble in water are soluble in other solvents. When no more solute can dissolve in asolution, we say it is a saturated solution. An unsaturated solution is one where it is possible to dissolve more solute in the solvent. Solutions are special kinds of mixtures. When we want to decide whether amixture is also asolution, we can use the following questions to decide: Question about the mixture Can you see the solute in the solvent? Does the solute settle out? Can the mixture be separated using filtration? Can the mixture be separated by evaporation? The mixture is a solution No Yes No Yes No Yes Yes No 150 Matter and Materials The mixture is NOT a solution
KEY CONCEPTS • A solution is aspecial kind of mixture. Like all mixtures it consists of two (or more) substances mixed together. • A solution is made up of asolvent (such as water) in which one or more solutes have been dissolved. • In asolution, the solute looks as if it disappears into the solvent. This is because the particles of the solute and the solvent become closely mixed. • There are many kinds of solutions, but the most well-known ones are mixtures of a solid and a liquid, such as sugar and water. • Not all substances dissolve in water. Those that dissolve are called soluble substances; those that do not dissolve are called insoluble substances. • Solutions cannot be separated by sieving, filtering, hand sorting, or settling and decanting. This is because solute particles are dispersed between the solvent particles. • Solutions can be separated by heating so that the solvent evaporates. The dry solute will be left behind. • When we have dissolved so much solute in the solvent that no more solute can possibly dissolve, we say that the solution is saturated. Chapter 3. Solutions as special mixtures 151
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Natural Sciences and Technology Gra
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AUTHORS LIST This book was written
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Welcome to Grade 6 and to Natural S
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Hey! My name is Tom. I have two pla
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Hello! My name is Sophie. One of my
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Table of Contents Life and Living a
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Scientists have found out exactly h
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- stem (sugar cane) - seeds (wheat
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2. Design a poster for your Gr 4fri
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Sunflower seeds. Lettuce. Sugar can
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QUESTIONS: 1. Was it easy to distin
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QUESTIONS: 1. Which test do you thi
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QUESTIONS: 1. Make a list of living
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REVISION: 1. List the four things t
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7. What do plants store glucose as?
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Examples of the foods in the food g
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3. Fats and oils: Meat. Lentils. Al
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Name of vitamin Sources Function Vi
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Very often food manufacturers add d
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The natural foods contained a mixtu
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KEY CONCEPTS • Food groups: - foo
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Name of vitamin Vitamin A Vitamin C
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• The food in the middle of the p
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Tuesday Wednesday Thursday Friday t
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4. What important food group is Raj
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Breakfast: Option 1: Fruit loops Op
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Supper: Option 1: Chicken pieces Op
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Causes of apoor diet There are many
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• Diabetes: This is adisease that
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3. On your poster, you must include
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4. Write a paragraph where you expl
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ACTIVITY: A REALLY old role play Wo
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2. Can you predict how the locals w
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Benefits of food processing Food pr
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Food Reason for being processed Raw
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ACTIVITY: Class discussion INSTRUCT
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Highly processed foods: • Highly
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preserve it, just like people did 3
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ACTIVITY: Comparing traditional and
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5. Use the space below to draw a fl
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KEY CONCEPTS • Food is processed
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5. A farmer wants to export some gr
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I really enjoyed that, especially l
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• arctic and alpine tundra are in
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A unique South African ecosystem So
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A healthy ecosystem is one in which
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In this man-made forest, there is n
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• insectivores only eat ... can y
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A food web in asavanna. There are a
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• Forest ecosystem: grass, small
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7. When marking out your ecosystem
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2: 3: Animal species: 1: 2: 3: Chap
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interdependent and they are connect
Page 109 and 110: REVISION: 1. Provide a definition f
Page 111: 10. What choices do you need to mak
Page 115 and 116: Did you know that all matter is act
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: dissolved limestone can crystallise
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 and 168: changes are called. QUESTIONS: 1. W
Page 169 and 170: 4. What do we call it when we have
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
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STEP 3: AERATION The raw water now
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6. Name the 5steps in the water tre
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Natural Sciences and Technology Grade 6-A - Thunderbolt Kids

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