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Chemical Reactions
1.
7F Simple chemical
reactions 7F Simple chemical reactions Chemical change Reactions with acid Reactions with oxygen © OUP: To be used solely in purchaser’s school or college
2.
7F Simple chemical
reactions Chemical change © OUP: To be used solely in purchaser’s school or college
3.
7F Chemical change
– Changing materials The world around us contains many different materials. How many different materials can you see in this bedroom? © OUP: To be used solely in purchaser’s school or college
4.
7F Chemical change
– Changing materials Materials can be changed in different ways. A physical change means a material changes size, shape or state of matter. e.g. Ice melts at room temperature. A physical change can be easy to reverse. What is the reverse of ice melting? © OUP: To be used solely in purchaser’s school or college
5.
7F Chemical change
– Changing materials A chemical change to a material results in a completely new material being made. e.g. A bicycle left outside has become rusty. A chemical change is very difficult to reverse. Could you change the rusty bicycle back into a non-rusty one? © OUP: To be used solely in purchaser’s school or college
6.
7F Chemical change
– Physical or chemical? © OUP: To be used solely in purchaser’s school or college
7.
7F Chemical change
– What is a chemical reaction? A chemical change is also called a chemical reaction. A chemical reaction can be shown by a word equation: reactants products The starting materials that The new materials react with each other are produced by the reaction called the reactants. are called the products. What does the arrow in the word equation mean? © OUP: To be used solely in purchaser’s school or college
8.
7F Chemical change
– Formation of water The word equation for the formation of water is: hydrogen + oxygen water Name the reactants and the product of this reaction. © OUP: To be used solely in purchaser’s school or college
9.
7F Chemical change
– Test your reactions! 1. In a chemical reaction, the properties of the reactants and products are… a) exactly the same. b) very different. c) very colourful. 2. When a chemical reaction takes place, the products can be turned back into the reactants… a) very easily. b) with difficulty. c) with a magic wand. © OUP: To be used solely in purchaser’s school or college
10.
7F Chemical change
– Test your reactions! 3. The speed of a chemical reaction… a) is always very slow. b) is always very fast. c) can range from very slow to very fast. 4. The products of a chemical reaction are shown on the left-hand side of a word equation. a) Always. b) Sometimes. c) On Thursdays. © OUP: To be used solely in purchaser’s school or college
11.
7F Chemical change
– Test your reactions! 5. The arrow in the middle of a word equation means… a) “turn right”. b) “react to make”. c) “equals”. 6. The starting materials involved in a chemical reaction are said to… a) act like each other. b) react with each other. c) read to each other. © OUP: To be used solely in purchaser’s school or college
12.
7F Chemical change
– Test your reactions! 7. Which of these processes is an example of an everyday chemical reaction? a) Freezing water. b) Melting butter. c) Baking bread. 8. Which of these is not a sign that a chemical reaction has taken place? a) Boiling. b) Bubbling. c) Blowing. © OUP: To be used solely in purchaser’s school or college
13.
7F Chemical change
– Test your reactions! 9. When sodium metal is heated it can react with chlorine gas. The word equation for the reaction is: sodium + chlorine sodium chloride What is the product of this reaction? a) sodium. b) chlorine. c) sodium chloride. 10. Rust forms when iron reacts with oxygen in the air. The word equation for this chemical reaction is: a) iron + rust oxygen b) iron + oxygen rust c) iron rust + oxygen © OUP: To be used solely in purchaser’s school or college
14.
7F Simple chemical
reactions Reactions with acid © OUP: To be used solely in purchaser’s school or college
15.
7F Reactions with acid - Acids in chemical reactions
What do you know about acids? Weak acids, like lemon juice and vinegar, are harmless. Strong acids must be handled with care. They are dangerous because they can react easily with materials such as skin, wood and cloth. You need to know about the chemical reactions of acids with metals and carbonates. © OUP: To be used solely in purchaser’s school or college
16.
7F Reactions with acid - Metals in chemical reactions
What do you know about metals? Metals are usually solid, shiny and strong. They are also good conductors of heat and electricity. Metals can be changed into new substances when they are involved in a chemical reaction. Some metals can react with acids. This type of chemical reaction is called corrosion. © OUP: To be used solely in purchaser’s school or college
17.
7F Reactions with acid - Reaction of metals with acid
Do all metals react with acids in the same way? sodium magnesium iron lead copper iron - the metal reacts slowly, producing a few bubbles lead - the metal reacts very slowly, producing very magnesium - the metal reacts quickly with the acid, copper - no bubbles, no reaction with acid sodium - the metal bursts into flames, a very strong reaction few bubbles producing lots of bubbles © OUP: To be used solely in purchaser’s school or college
18.
7F Reactions with acid - Reaction of metals with acid
When a metal does react with acid, the metal gets smaller and seems to disappear. But has the metal really disappeared? The metal has reacted with some of the acid. The products of this chemical reaction are a salt and the gas hydrogen. Complete the word equation for the reaction of a metal with an acid: metal + acid ? + ? © OUP: To be used solely in purchaser’s school or college
19.
7F Reactions with acid - Reaction of carbonates with acid
Carbonates are chemicals that contain carbon and oxygen. Carbonates can react with acids. © OUP: To be used solely in purchaser’s school or college
20.
7F Reactions with acid - Reaction of carbonates with acid
Calcium carbonate reacts with acid to produce a gas which turns the limewater cloudy. What is the name of this gas? The other products of this reaction are a salt and water. Complete the word equation for the reaction of a carbonate with acid: carbonate + acid ? + ? + ? © OUP: To be used solely in purchaser’s school or college
21.
7F Simple chemical reactions
Reactions with oxygen © OUP: To be used solely in purchaser’s school or college
22.
7F Reactions with
oxygen – What is burning? Burning is a chemical reaction. When things burn they react with oxygen in the air and energy is released as heat and light. This chemical reaction is also called combustion. Can you name the three things needed for combustion? © OUP: To be used solely in purchaser’s school or college
23.
7F Reactions with
oxygen – Fire triangle A fire only burns with all three parts of the fire triangle. oxygen heat This colourless gas Some energy is needed is needed for all to start the burning substances to burn. reaction – this is usually n he e heat energy from a yg at ox spark or a flame. fuel fuel Any substance that can burn (or combust) is called a fuel. How can firefighters use the fire triangle to control fires? © OUP: To be used solely in purchaser’s school or college
24.
7F Reactions with
oxygen – Products of burning Complete the word equation for this reaction: carbon + oxygen ? © OUP: To be used solely in purchaser’s school or college
25.
7F Reactions with
oxygen – Candle in bell jar Oxygen is a gas found in the air around us. Is oxygen the only gas found in the air? © OUP: To be used solely in purchaser’s school or college
Editor's Notes
TEACHER’S NOTES Answers: 1b) 2b)
TEACHER’S NOTES Answers: 3c) 4a)
TEACHER’S NOTES Answers: 5B) 6b)
TEACHER’S NOTES Answers: 7c) 8c)
TEACHER’S NOTES Answers: 9c) 10b)
TEACHER’S NOTES - table of results? - Which metal is the most reactive? - Which metal is the least reactive? - What gas is being formed?
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