What could go wrong in this lab? Write a list in the back of your book.

What could go wrong in this lab? Write a list in the back of your book

HAZARD WARNINGSIn chemistry we use different hazard

symbols on things we use (e.g. Chemicals) to warn us how they could harm us if we are

not careful.

WHAT DO YOU THINK THESE SYMBOLS MEAN?

Explosive

WHAT DO YOU THINK THESE SYMBOLS MEAN?

Flammable

WHAT DO YOU THINK THESE SYMBOLS MEAN?

Acutely Toxic

WHAT DO YOU THINK THESE SYMBOLS MEAN?

Harmful to the environment

THE NEXT TWO ARE THE ONES YOU MAY SEE IN

YEAR 7

WHAT DO YOU THINK THESE SYMBOLS MEAN?

Corrosive

WHAT DO YOU THINK THESE SYMBOLS MEAN?

Moderate hazard

BUNSEN BURNER

Introducing Science

If they are good enough for Hogwarts they are good enough for

us!

ROBERT BUNSEN We heat things with a Bunsen burner in the laboratory.

Robert Bunsen, a German chemist, invented this apparatus in 1855.

WHAT ARE THE PARTS OF A BUNSEN BURNER?

Label the diagram using these words.air hole chimney collar tubing gas tap

chimney

air hole

collartubing

gas tap

HOW DO WE USE A BUNSEN BURNER?1. Join the burner to a gas tap.

How do we use a Bunsen burner?

2.Close the air hole.

How do we use a Bunsen burner?

3.Light a splint and hold it over the chimney.

Turn on the gas tap.

THE BUNSEN FLAME I What will be the colour of the flame when the air hole is

closed?

This is a luminous flame.

THE BUNSEN FLAME II Open the air hole slowly. What will be the colour of the flame when the air hole is

opened?

This is a non-luminous flame.

CHECK POINTUse suitable words to fill in the blanks. The non-luminous flame is (a) in colour. The luminous flame is (b) in colour. The (c) flame is easier to see.

(a) yellow(b) blue(c) luminous

WHICH KIND OF FLAME IS HOTTER?

Flame I with air hole CLOSED yellow in colour luminous

Flame II with air hole OPENED blue in colour non-luminous

? ?

What safety rules do you thinks we should set?

Monday 10th September

6 Lab safety Rules

Today’s date

Underlined with a ruler.

The title in blue or black pen

Neatly laid out

Remember every piece of neat work should have the following:

6 LAB SAFETY RULES

1. Wear goggles at all times2. Tie back hair3. Stand up4. Tuck in stools and bags5. Keep desks clear6. No eating or drinking during

practicalsYou WILL be removed from the practical if

you break these rules

HOW TO HEAT AN OBJECT? (1)

The apparatus used in the procedure of heating:What are these?

Tripod Bunsen Burner

Wire gauze

Beaker

HOW TO HEAT AN OBJECT? (2)

1 .Prepare a Bunsen Burner

2. Put a tripod over the Bunsen Burner

3 Place a wire gauze onto the tripod

HOW TO HEAT AN OBJECT? (3)

5. Then add water into the beaker 4. Put a beaker onto

the wire gauze

WHAT HAZARDS CAN YOU THINK OF FOR THIS EXPERIMENT?

At the end the water will be boiling hot.

The metal gauze will be hot

The top of the tripod will be hot

The top of the Bunsen burner will be hot

If the beaker is dropped it will smash

Heating with a naked flame

Heating a hot solution

SO SHOULD WE DO?

At the end the water will be boiling hot.

The metal gauze will be hot

The top of the tripod will be hot

The top of the Bunsen burner will be hot

If the beaker is dropped it will smash

Allow everything to cool before packing

away

Heating with a naked flame

Heating a hot solution

Don’t pick up the hot beaker. If it breaks tell your teacher.

Tie back long hair, tuck in tie.Clear desk

WEAR GOGGLESStand up

MEASURING THE TIME TAKEN TO BOIL A CERTAIN AMOUNT OF WATER

Fill a beaker with 50 cm3 of tap water

Set up the apparatus as shown in the diagram

Heat the water with the blue flame of a Bunsen Burner until it boils

Use stop-watch to find out the time taken

Can you add anything else to your list now?