Y7Chemistry-Lessons1-3

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YEAR 7 CHEMISTRYSoW FOR PUPIL TRACK 1 :

THE PARTICLE MODEL~ SEPTEMBER-OCTOBER 2012 ~

Lesson 1 - - - - Safety

Lesson 2 - - - - The Bunsen Burner

Lesson 3 - - - - Heating Substances Safely

Lesson 4 - - - - Solids, Liquids and Gases

Lesson 5 - - - - Changes of State

Lesson 6 - - - - Melting and Freezing

Lesson 7 - - - - Diffusion

Lesson 8 - - - - Gases and Air Pressure


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Lesson 1 : SafetyLesson Objectives:1. That Chemistry is the study of chemicals and materials.2. That there are many hazards in the Chemistry laboratory and the importance of working safely.

Year 7Chemistry

Pupil Track 1

Sep-Oct 2011

TIMING

0-5min

5-45min

45-50min

StarterDemo exploding can (optional) to emphasise the potential dangers of gas taps andthe importance of safe working in the laboratory.Or Use SAFETY.ppt PowerPoint Presentation (PPP) to introduce the topic.

Main Body What is meant by a hazard? Ascertain from pupils some of the possible dangers / hazards that might be

present / occur in the lab. Spider diagram of their ideas on the board. In pairs, ask boys to make up 5 lab. Rules in rough and list them in order of

importance. Obtain ideas from each group. W.1.2 Lab Rules; discuss. Boys stick in books.

Ask boys for examples from everyday life where they might see a hazardwarning symbol (e.g. road signs, warning flags on the beach, signs onelectrical installations, pylons etc).W.1.3 Hazard Symbols to stick in books. Discuss.

Using W.1.4 Spot the Hazard, get boys to identify as many hazards as possible.

PlenaryDiscuss hazards found and their potential consequences.

Homework

Either a) choose one lab. rule and design a hazard sign to represent it

Or b) design a hazard sign of their own choice e.g. slippery floor, broken glass etc.

The best posters should be passed to the KS3 leader for a walldisplay.

RESOURCES/ NOTES

Riley: ChemistryNow! textbook

Worksheets infiling cabinetunder Staff Room

phone:

1. W.1.2 LabRules

2. W.1.3 Hazard

Symbols3. W.1.4 Spot theHazard

PowerPointpresentationsand videos in

R:/Science/KS3/Y 7/ Chemistry/Lesson

Resources.


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Lesson 2 : The Bunsen BurnerLesson Objectives:1. That the Bunsen burner is used in the Chemistry laboratory to heat substances.2. How to light a Bunsen burner safely.3. How to heat a solid safely using a Bunsen burner.4. How to change the nature of the flame of a Bunsen burner.

Year 7Chemistry

Pupil Track 1

Sep-Oct 2011

TIMING

0-10min

10-45min

45-50min

Starter Introduce the Bunsen burner and its parts W1.5 The Bunsen Burner and W1.6

The Bunsen Burner Ask boys to identify potential hazards when working with the Bunsen burner and

what steps they could take to minimize the risks to themselves and others. Go over PPP SAFETY.ppt

Main Body1. Demonstrate and explain the safe lighting of the Bunsen burner (boys to make

notes under this title) also hand out sheet W.1.6. Refer specifically to thefollowing rules and why we follow them:

2. Eyewear 3. Heat proof mat4. Stand up

5. Rubber tubing firmly on gas tap6. Air hole closed7. Lighted splint ready8. Face and hair well back 9. Light at arms length and at a safe distance from the chimney

2. Demonstrate the safe heating of a solid (boys to make notes under this title) hydrated dehydrated copper sulphate crystals in an ignition tube. If time,discuss the reaction and the fact that it can be reversed by adding water. Refer specifically to the following rules and why we follow them:

3. Ignition tube held in a test tube holder, close to the neck 4. Held at 45 angle5. Held away from themselves and others6. Heat lower end of tube only

7. Keep tube moving gently8. Place hot tube on a heat proof mat3. Class practical: The Bunsen burner. Boys should follow the method on sheet

W1.6, noting their observations in rough (copy up in neat for homework).

Plenary Discuss with boys what they have learned about the nature of the Bunsen burner

flames. If time permits you may wish to demonstrate the presence of unburned gas in

the blue cone using a glass tube to sample the contents of the blue cone and lightthe gas at the opposite end of the tube.

Homework Boys to complete the sheet in neat and stick into their exercise books.

RESOURCES/ NOTES


Worksheets infiling cabinetunder Staff Room

phone:

1. W1.5 TheBunsen Burner

2. W1.6. The

Bunsen Burner



Resources.

Information for Technician

Equipment required for class practical (x13):

Safety glasses x26Bunsen burners x13Heatproof mats x13Tongs x13Pieces of broken pot/crucible, or crucible lidsCopper wire attached to a cork x13

Equipment required for teacherdemonstration:Safety glasses x1Bunsen x1Heatproof mat x1Ignition tube containing 2-3 spatulas of CuSO4.5H2O x1Test tube holder x1MatchesSplintsTongs x1


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Risk Assessment


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Lesson 3 : Heating Substances SafelyLesson Objectives:1. How to heat a liquid safely using a Bunsen burner.2. To understand why liquid will evaporate when heated using a Bunsen burner.

Year 7Chemistry

Pupil Track 1

Sep-Oct 2011

TIMING

0-5min

5-45min

45-50min

StarterDiscuss ideas relevant to this topic.

Main BodyActivity 1Demonstrate the safe heating of a liquid (water) in a boiling tube to include the following

points, which the pupils should record:1. Eyewear 2. Stand up3. Add a few anti-bumping granules to the liquid4. Blue flame (half-open vent)5. Boiling tube held close to the neck by a test-tube holder 6. boiling tube held at a 45-degree angle7. Boiling tube directed away from yourself and others8. Heat just below the surface of the liquid9. Keep tube moving gently10. Place hot boiling tube in a beaker for support, on the heat-proof mat

Activity 2Introduce the measuring cylinder to measure volumes accurately (more accurate than a

beaker or conical flask). Highlight that the measurement is taken from the bottom of themeniscus, read when the eye is horizontally adjacent to the mark.Pupils to then measure 15ml water using the measuring cylinder. They should transfer thisto a boiling tube and heat safely, as discussed. They should allow the water to boil for about 30seconds and then stand in a beaker to cool for a few minutes. They should thenreturn the water to the measuring cylinder and note the new volume.

PlenaryDiscuss the reduction in the volume of water why has this occurred?= The Bunsen burner supplies the water particles with energy so that they move faster andsome have enough energy to overcome the forces of attraction between the particles andescape into the air evaporation.

Homework Write a brief account of the measurement of volume including a diagram and an accountof safe heating of a liquid

RESOURCES/ NOTES




Resources.

Information for Technician

Equipment required for class practical (x13):

Bunsen burnersHeat-proof matsSplintsTest tube holdersBoiling tubesPorous pot/ anti-bumping granulesWash bottles150ml beaker 25ml measuring cylinders

+ Matches

Y7Chemistry-Lessons1-3

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