Beginning to be a Chemist Home-work. Home-work No. Date Parents/Guardian Signature Investigation. S1 Science

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1 Unit 3: Beginning to be a Chemist Home-work Home-work No. Date Parents/Guardian Signature Investigation Comment from parents/guardian S1 Science

2 Home-work 1. States of matter (5) (6)

3 3. SOLIDS Description All solids are hard Solids can flow A solid will keep it s shape if you leave it alone Solids always take up the same space You cannot see through solids Some solids are soft Light can pass through some solids Solids cannot move on their own A solid will take the shape of its container LIQUIDS Description All liquids are clear Liquids can flow Liquids are a fixed shape Light can pass through some liquids A liquid will take the shape of its container Liquids always take up the same space A liquid always fills its container or or (1) (1) GASES Description All gases are colorless You can see through a gas A gas can spread as far as it can Gases cannot flow A gas always keeps the same shape Gases always take up the same space Gases can flow or (1)

4 1 Home-work 2. Changing states

5 4.

6 5 (5)

7 Home-work 3. Elements and compounds 1. (1)

8 2. (1) 3. Complete the blanks below An element is a substance that contains only one type of. A is a substance that contains different types of atom joined together. (2)

9 4. a) What is the name of the reaction taking place in the diagram above? b) Why is energy needed to split a compound? c) Copper is deposited at one electrode. What gas is formed at the other? (3)

10 Home-work 4 The Periodic table 1. are the simplest substances from which every new substance in our world is made. They are found arranged in a chart called the. The elements are arranged in rows called (hence Periodic Table) and are also arranged in columns called. Some of the groups have similar chemical properties this means they in a similar way. About of these elements have been discovered in the Earth or in the atmosphere; some in large quantities and some in small quantities. Most of the elements are naturally occurring in and on the Earth and a few are. This means they can be made by scientists.

11 Continued.. Elements are made of small particles called. Each element is made of only kind of atom. Every element is represented by its own and its own. This number tells us some very important information about the way atoms of each element are different from each other. (12)

12 2 (15)

13

14

15 1 Home-work 5. Metals from the Periodic table

16 Home-work 6. Chemical Reactions 1 All chemical reactions involve the formation of one or more substances. Chemical reactions can be identified by a change in e.g. colour change, a gas given off or a solid formed. Chemical reactions can also be identified by changes. Examples of chemical reactions around us are a) digestion of b) of food c) burning in a car engine. food petrol new appearance energy rotting (6)

17 2. When you carried out experiments at the beginning of this topic you made NEW SUBSTANCES which looked different from the original materials you used. This is because a had taken place. When elements react together the new substances which are made are called. The elements have become CHEMICALLY JOINED TOGETHER and are very to separate from each other. (3)

18 Home-work 7. Solutions and temperature 1. What is a solute? 2. What is a solvent? 3. Describe how a solution is made. 4. Describe what happens to the solubility of a solution when the temperature is raised. (4)

19 5 (4)

20 6 Home-work 8 Acids and Alkalis

21 1 Home-work 8. Acids and bases

22 1 2

23 3 4. What is a neutralisation reaction? 1 5. Give an example of an everyday neutralisation reaction. 1

24 6 (1)

25

26

27

28 Home-work 9 Acids and alkalis and reactions 1. What name do we give to the reaction between an acid and an alkali? 2. Use the words in the list to answer the following questions. Vinegar Lime Baking Soda (a) A Wasp has an alkaline sting. To neutralise it use (b) A farmer wants to neutralise acidic soil he should use (c) A bee has an acidic sting. To neutralise it use 3. A scientist took 6 beakers containing the same acid all at different temperatures. She then added identical pieces of magnesium and measured the time taken for the magnesium to disappear. Her results are shown below. Temperature of acid ( o C) Time for reaction (s) Draw a line graph of these results on the graph paper below, temperature should be on the x axis (a) At what temperature will the reaction take 50 seconds? (b) Predict the time for the reaction at 15 o C

29

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