7F Bubbles, bangs and burning. 07/01/2015 Starter find 4 things wrong with picture B. Look at the two pictures below. In picture B the scientist hasn’t been very careful. Write down the 4 errors he has made. 18/01/2019

7F Bubbles, bangs and burning I can make good observations. I know ways to tell if a chemical reaction has taken place. I know what a chemical reaction is. I know how a chemical and physical reaction are different from each other. I can give examples of a chemical and physical change.

How do we know a chemical reaction has taken place? Chemistry How do we know a chemical reaction has taken place?

How do we know a chemical reaction has taken place? Chemistry How do we know a chemical reaction has taken place?

How do we know a chemical reaction has taken place? Chemistry How do we know a chemical reaction has taken place?

we know a chemical reaction has taken place if we observe: -Colour change -gas or gases are produced -change in mass -light is given out -change in temperature.

Chemical reactions New materials are always made. Reactants turn into Products Key word dictionary

Chemical reaction means new stuff is made. Reactants → Products

Making good observations Include – Scientific words e.g. opaque, transparent, translucent Colours State of matter e.g. solid, liquid, gas smell, feel, temperature (hot, cold or warm is fine) Write in full sentences with capital letters and full stops.

I can tell the difference between chemical and physical reactions Chemical reaction Physical change

7F Bubbles, bangs and burning I can make good observations. I know ways to tell if a chemical reaction has taken place. I know what a chemical reaction is. I know how a chemical and physical reaction are different from each other. I can give examples of a chemical and physical change.

Chemical v/s physical changes 11/01/2015 Starter List 5 ways to tell a chemical reaction has taken place, for each way give an example. Give 3 examples of a chemical reaction. 3. Describe this picture

No new substances are made. The change is easily reversed. Physical Changes No new substances are made. The change is easily reversed.

Chemical Changes new substances are made. Reactants-->Products Changes are often permanent or irreversible - Colour change -gas or gases are produced -change in mass -light is given out -change in temperature.

Key words: Particle, reaction, chemical, physical, reversible, reactant, product, state. Level C - I have draw a labelled diagram to show the 5 ways to recognise a chemical reaction. - I have draw a labelled diagram to show a physical change. Level B - I have given an example for each type of chemical reaction ( give off light, give off gases, change the temperature, change in mass, change in colour). Level A – I have explained a chemical reaction in terms of reactants and products.

Change easily reversed Physical Chemical Change easily reversed Chemical Light given off Change in temperature Gas(es) given off Change in mass An example is when you add marble chips to acid it weighs less at the end of the reaction than at the start. Change in colour Physical change

Key words Reversible-reaction can go backwards Irreversible- reaction cannot go back wards. Chemical change- particles react to make new particles. Physical change- Same particles only arranged in a different way (e.g. solid liquid or gas) Reactants-particles we start with in a reaction Products-Particles we end up with after a reaction

Read page 79 Answer questions in book.

Toasting (burning) bread Frying an egg Boiling water Chemical or physical change ? Melting chocolate Salt dissolving Toasting (burning) bread Frying an egg Boiling water

Reactions that make hydrogen 13/01/2015 Starter When an acid reacts with an alkali what is made ? Acid + Alkali --> Salt + water e.g. hydrocholric + sodium --> sodium + water acid hydroxide cholride

Reactions that make hydrogen Describe the reaction of some metals + oxygen Describe the reactions of some metals and acids Describe the test for hydrogen gas Be able to write some word equations for the reactions of some metals and acids.

Reactions that make hydrogen Some metals react with acids to make hydrogen gas. Metals + Acid --> Salt + Hydrogen (MASH) E.g. Iron + Hydrochloric acid --> Iron chloride + Hydrogen

E.g. hydrochloric acid + sodium sodium chloride + hydrogen Extension Salts name has two parts The first part comes from the metal The second part from the acid E.g. hydrochloric acid + sodium sodium chloride + hydrogen Complete the following Sodium + nitric acid  Zinc+ sulfuric acid Magnesium + hydrochloric acid  18 January, 2019

Testing for hydrogen “POP” A LIT Splint makes a squeaky pop when in contact with hydrogen gas. “POP” 18/01/2019

Trap hydrogen for 30 seconds. Testing for hydrogen Trap hydrogen for 30 seconds. Test gas A LIT Splint makes a squeaky pop when in contact with hydrogen gas. “POP” 2 cm3 of acid 1 piece of metal 18/01/2019

For each metal Write an equation for the reaction. Add the metal to 2cm3 of acid Trap the gas Test for hydrogen Extension which metal/acid combination do you think was the most reactive and why?

Copy and complete the following. Adding an ____ to some metals will cause a reaction to happen. This reaction will produce a ____ and ________ gas. Hydrogen gas is tested by putting a lit splint into the gas and a ______ ___ is heard. Not all metals react. For example _________ will react but ______ doesn’t. Zinc reacts but only slowly. acid salt hydrogen squeaky pop magnesium copper magnesium, squeaky pop, salt, hydrogen, acid, copper 18/01/2019

Reactions to make carbon dioxide 11/01/2015 Starter. 1. The test for hydrogen gas is _____________ Copy and complete 2. Zinc + hydrochloric acid --> _______ + ______ 3. _____+ nitric acid --> lead nitrate + hydrogen 4. Iron + _________--> iron sulfate + hydrogen

Reactions to make carbon dioxide 11/01/2015 To Independently research some different gases To make carbon dioxide in the laboratory To test for carbon dioxide in the laboratory.

Reactions to make carbon dioxide 11/01/2015 1. Read together page 81 2. Answer questions on page 81 3. Complete worksheet make and test for carbon dioxide.

Adding acid to carbonates Carbonates are compounds containing carbon and oxygen. When an acid is added to a carbonate the carbonate starts to _______ and ________. A gas called ______ _______ is produced. Carbonates used to be used as building materials but aren’t any more because acid rain would eventually ________ the building. Gas Limewater Limewater turns milky/cloudy Words – dissolve, fizz, carbon dioxide, oxygen 18/01/2019

Copy and complete the following metal carbonate Adding a _____ _________ to dilute acid will cause a reaction. This is because there is ______ due to a gas being produced and in some cases a ______ ______. When _______ acid is added to ______ carbonate it fizzes and produces a gas and the solid changes from _____ to ____. The gas produced is tested with ________ which goes cloudy which is a positive test for ______ _______. fizzing colour change sulphuric copper green blue limewater Carbon dioxide Blue, carbon dioxide, metal carbonate, sulphuric, copper, limewater, green, colour change, fizzing 18/01/2019

Oxygen test 11/01/2015

Corrosion What has happened ? corrosion Iron has reacted with oxygen and water to make a new substance iron oxide.

Burning things When something is burned it reacts with oxygen. For example: Magnesium + oxygen Magnesium oxide Carbon + oxygen Carbon dioxide Sulphur + oxygen Sulphur dioxide Fire The Fire Triangle Oxygen Fuel Heat 18/01/2019

Fuels Fuels are substances that can be used to release useful amounts of energy when they burn, e.g. Wood Gas Oil 18/01/2019

Fuel + oxygen Carbon dioxide + water Burning fuels When fossil fuels (coal, oil and gas) are burned they produce water and carbon dioxide. We can use this apparatus to show this: What is the general equation for combustion? Fuel + oxygen Carbon dioxide + water 18/01/2019

Questions Describe an experiment that produces carbon dioxide and how to test for it. What is formed when Magnesium reacts with oxygen? Write out the general equation for combustion. Identify the reactants and products in the equation. Give 3 examples of fuels difficult to burn and 3 that are easy to burn. Which are most useful in a car? Describe what is burning in a candle. How do you test this? 18/01/2019

Starter: Give an example in each box Extension: explain the difference between a chemical and physical change. Chemical Light given off Change in temperature Gas(es) given off Change in mass Change in colour Physical

Aims: To recognise if a reaction is physical or chemical (3) To know how to recognise a chemical reaction (4) To give examples of chemical reactions (4) Level 5 challenge. BLP : Capitalising Managing distractions

Which is a chemical reaction and which is a physical reaction ? Melting wax Burning paper

Which gas ? Relights a glowing splint ? Makes a squeaky pop noise when it meets a flame ? Puts out a flame ?

Guess the gas!

What is the odd one out ?

Quiz: What are the reactants needed to make a cake ? Egg, flour, butter, Acid and marble chips An oven and a cook baking tray Magnesium and a Bunsen

Quiz: What are the reactants needed to make hydrogen gas? Egg, flour, butter, Acid and marble chips An oven and a cook baking tray Magnesium and an acid

Quiz: What is the test for hydrogen gas ? A glowing splint re-lights A glowing splint make a squeaky pop noise A light splint make a squeaky pop noise The splint goes out

Quiz: What is the test for oxygen gas ? A glowing splint re-lights A glowing splint make a squeaky pop noise A light splint make a squeaky pop noise The splint goes out

Quiz: What is the test for carbon dioxide gas ? A glowing splint re-lights A glowing splint make a squeaky pop noise A light splint make a squeaky pop noise The splint goes out

Quiz: What is a use for carbon dioxide gas ? Fire extinguishers Lighting fires As a fuel The splint goes out

Quiz: What is a use for oxygen gas ? Fire extinguishers Lighting fires As a fuel The splint goes out

Quiz: What is a use for hydrogen gas ? Fire extinguishers Lighting fires As a fuel The splint goes out

Quiz: What gas is not in the air? Nitrogen oxygen chlorine Argon