fFe.giffplus.giffS.giffarrow.giffFeS.gifThe BIG KS3 Science-Chemistry crossword on "Compounds and Mixtures"


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KS3 chemistry index * Crossword puzzle ANSWERS

Across:
2 When hydrogen burns with oxygen in air, you say they have (10,8) to form water.
4 Is sodium chloride (salt) a compound? (3)
6 To get the salt back from its mixture with water, you must (9) the water by heating.
9 After initially heating an iron-sulphur mixture, on removing the bunsen flame the mixture still (5,3)
10 This is H2O for water! (7)
11 This fizzes with acid to form carbon dioxide and dissolves to form a blue solution. (6,9)
13 The number of atoms in the molecule CH4 (4)
14 For a particular pure substance, this does not change however you make it! (11)
18 The largest percentage element in air. (8)
19 The total number of atoms in two oxygen molecules. (4)
22 When two chemicals are mixed and heat up and the colour changes, it is a sign that an (8,6) has happened
23 The type of non-chemical change when water boils. (8)
26 In order to make cylinders of oxygen for hospitals, you must do this to the components of air by fractional distillation. (10)
27 The formula of magnesium oxide, but one letter should be strictly lower case! (3)
28 A well known metal wire burns with sparks to form this when steel wool is heated strongly in air. (4,5)
29 A magnet and colour can (11) between iron and sulphur
32 Two different types can combine make a new compound. (4)
34 you need this to prove anything in science! (8)
35 The total number of atoms in C2H6O2 (3)
36 Iron sulphide is an example of this type of substance. (8)
38 The number of atoms in H2SO3 (3)
39 The number of atoms in NH4Cl (3)
40 For carbon this is C (6)
41 At this point a substance rapidly turns to a gas. (7)
42 The melting point for any pure substance is (5).
44 This will separate iron and sulphur before they are heated. (6)
Down:
1 The formula of carbon dioxide. (3)
2 Burning a fuel is an example of an (8,8) that releases heat energy.
3 Shiny silvery grey magnetic solid until you heat it with sulphur. (4)
5 This is usually released when a compound readily burns! (6)
7 A well known compound is doing this below 0oC! (8)
8 The 2nd part of the name of a compound (7) formed by combining an element with sulfur (not ph here!)
10 The number of atoms of oxygen in the formula of sulphuric acid. (4)
12 Fixed points of pure substances at their melting or boiling (5)?
14 This takes place when the gas or vapour produced in distillation is cooling. (12)
15 Usually a mixture, and is a mineral source of useful metals. (3)
16 The number of oxygen atoms in nitrogen dioxide! (3)
17 Hydrogen, oxygen and water are all examples of this type of particle. (8)
20 An iron and sulphur powder mixture becomes this with a magnet! (9)
21 You cannot split this into a simpler substances but 92 of them naturally occur! (7)
24 The formula of sulphuric acid. (5)
25 The number of elements combined to form sodium chloride. (3)
30 The green gaseous element chlorine is unfortunately very (5)!
31 At this (7) point at 120oC sulphur changes from a yellow solid to a yellow-brown liquid.
33 The gases in air are an example. (7)
37 The element made by photosynthesis. (6)
38 A yellow solid, not magnetic and not ph!. (6)
43 The formula of iodine fluoride? (2)

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