Chemistry questions

Chemistry questions to help you revise.
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No Question Answer
1 What process would you use to separate some blue dye from black ink (distillation, filtrtaion, evaporation or chromatography)?  Answer
2 What colour does copper turn when it is heated?  Answer
3 Flour is insoluble in water. When flour is shaken with water it will form a A: solution B: suspension C: filtrate  Answer
4 Iron, Copper, Aluminium, Plastic. Which of these substances is used to make electric wiring.. Explain the reasons.  Answer
5 If some salt is dissolved in warm water the water used is called the A: solution, B: solute, C: solvent? Answer
6 What process of separation would you use to obtain salt from salty water (filtration, distillation or evaporation)?  Answer
7 Iron, Copper, Aluminium, Plastic. Which of these substances is used to make the body of an aircraft.. Explain the reasons.  Answer
8 What process of separation would you use to remove sand from salty water (filtration, distillation or evaporation)?  Answer
9 A large lump of salt is dropped into cold water. Describe three things you could do to make the salt dissolve quicker  Answer
10 Name a gas that relights a glowing splint  Answer
11 Name a dense, yellow metal that is often used to make jewellery.  Answer
12 Name any two substances found in the home that may be alkaline:   Answer
13 Name an element that burns with a bright white flame   Answer
14 Iron, Copper, Aluminium, Plastic. Which of these substances would you use to make a washing up bowl.. give a reason.   Answer
15 What colour is magnesium oxide   Answer
16 What colour is sulphur?  Answer
17 Iron, Copper, Aluminium, Plastic. Which of these substances is usually used to make bridges. Explain the reasons.   Answer
18 Explain some disadvantages of using iron to make bridges  Answer
19 If some salt is dissolved in warm water the resulting mixture will be called a …… A: solution, B: solute, C: solvent ?  Answer
20 Plastic is often used to make cheap objects like washing up bowls.. give two disadvantages of using plastic.  Answer
21 Is sulphur a mixture, compound or element  Answer
22 If Litmus indicator was added to a liquid of pH 5 what colour would it go?  Answer
23 If some salt is dissolved in warm water the salt is called the A: solution, B: solute, C: solvent ?  Answer
24 What colour would universal indicator turn when added to indigestion powder?  Answer
25 Sugar is soluble in water. If sugar is shaken with water it will form a A: solution, B: suspension C: filtrate   Answer
26 What chemical is formed when copper is heated in air?  Answer
27 What process of separation would you use to obtain fresh water from salty water (filtration, distillation or evaporation)?  Answer
28 What colour is hydrated copper sulphate  Answer
29 Describe two things that happen when water is added to anhydrous copper sulphate  Answer
30 Why does iron go brown when it touches copper sulphate solution?  Answer
31 Name an element that burns to form an acidic oxide  Answer
32 What substance is used during the test for carbon dioxide gas   Answer
33 To show if a liquid contains water you would add it to what chemical?   Answer
34 What colour does anhydrous cobalt chloride turn when added to water?  Answer
35 approximately how many elements are there? a) less than 50. b) between 50 and 150 c) more than 150   Answer
36 Pick out an alkaline oxide from the list below: A: sulphur dioxide, B: sodium chloride, C: magnesium oxide  Answer
37 Name the liquid formed formed when blue copper sulphate decomposes:   Answer
38 Why is lime sometimes added to garden soil?  Answer
39 How could you show if a colourless liquid contained anything dissolved in it?  Answer
40 Pick a neutral oxide from this list: Magnesium oxide, water, sulphur dioxide, carbon dioxide
  Answer
41 What is the chemical test for oxygen?   Answer
42 In a common industrial process, carbon is heated with iron oxide. What everyday substance is being produced?  Answer
43 Iron is more reactive than copper. Describe two changes you may observe if iron is added to copper sulphate solution.   Answer
44 Is water a mixture, compound or element?   Answer
45 If copper sulphate were heated would it’s mass gain, get less or not change?  Answer
46 Name a substance with a pH value less than pH7  Answer
47 Is air a mixture, compound or element?  Answer
48 Carbon is more reactive than copper. What two chemicals would be formed when powdered wood charcoal is heated with copper oxide?
  Answer
49 Write the word equation for the reaction between magnesium and copper oxide
  Answer
50 Which of these elements conducts electricity?
Sulphur, carbon, iodine, oxygen
   Answer
51 Is carbon a metal or non-metal ?  Answer
52 Name a chemical compound that decomposes to produce carbon dioxide when it is heated:  Answer
53 If some copper foil were heated strongly in air would it’s mass increase, decrease or not change?  Answer
54 If anhydrous copper sulphate is mixed with cold water , the resulting mixture is slightly warm. Why do you think this is?  Answer
55 Name a gas that causes acid rain  Answer
56 A piece of copper is placed into a test tube which is sealed and then weighed. The copper is heated until it goes black. The same sealed test tube + copper is now weighed again. Would the mass increase, decrease or not change?  Answer
57 Write down the word equation for the reaction that takes place when magnesium burns  Answer
58 Name a non-metallic element that conducts electricity   Answer
59 Name a non-metallic element that melts easily and burns with a blue flame to form a gas with a choking smell.   Answer
60 Name a substance that will burn completely away when heated, forming a colourless gas that turns limewater cloudy.   Answer
61 Name a metallic element that burns in air to form an alkaline oxide   Answer
62 Why is lime sometimes added to garden soil?   Answer
63 A substance has a melting point of 113°C and a boiling point of 445°C. Is it a solid liquid or gas?    Answer
64 What is the test for oxygen gas?   Answer
65 What colour does anhydrous cobalt chloride turn when added to water?    Answer
66 Describe two things that happen when water is added to anhydrous copper sulphate    Answer
67 Which element has the symbol Mg?
   Answer
68 Give the name of a natural substance made mostly of calcium carbonate.   Answer
69 What is the normal percentage of oxygen in the air?    Answer
70 Name the most abundant gas in the atmosphere    Answer
71 A substance has a melting point of -39°C and a boiling point of 357°C. Is it a solid liquid or gas?    Answer
72 What percentage of the air is nitrogen?
   Answer
73 Name two products when magnesium reacts with zinc oxide:    Answer
74 Name TWO substances released into the air when a candle burns.    Answer
75 Give the name and colour of the products formed when burning magnesium reacts with carbon dioxide.    Answer
76 Some copper foil is heated in a sealed tube until the copper stops changing colour. What gas remains in the tube?   Answer
77 Suggest a pH value for some indigestion powder designed to cure acid indigestion.   Answer
78 What gas is formed when sulphur burns?    Answer
79 What gaseous product would you expect when carbon reacts with magnesium oxide?   Answer
80 Aluminium is a common metal… what makes it so expensive to manufacture?   Answer
81 If copper metal were heated would it’s mass gain, get less or not change?   Answer
82 What is the chemical name for the substance we call table salt?    Answer
83 What do we call the reaction between sodium hydroxide and hydrochloric acid.
   Answer
84 What is the approximate percentage of oxygen in the atmosphere  Answer
85 What would happen to a piece of copper if it were heated in a tube of nitrogen?   Answer
86 Name one of the two products formed when sodium hydroxide reacts with hydrochloric acid hydrochloric acid.  Answer
87 What common name is given to the chemical called sodium chloride?  Answer
88 Name a gas that turns limewater cloudy  Answer
89 What is the chemical test for oxygen gas ?  Answer
90 What is the chemical symbol for oxygen?
  Answer
91 What experiment would you do to try and convince a friend that copper sulphate is a compound?   Answer
92 A substance has a melting point of -218°C and a boiling point of -183°C. Is it a solid liquid or gas?  Answer
93 Aluminum is often used to make saucepans. Describe properties of aluminium that make it suitable for this.   Answer
94 Name a gas that burns with a squeak Answer]  zy pop   Answer