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

H AZARD W ARNINGS In 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.

W HAT DO YOU THINK THESE SYMBOLS MEAN ? Explosive

W HAT DO YOU THINK THESE SYMBOLS MEAN ? Flammable

W HAT DO YOU THINK THESE SYMBOLS MEAN ? Acutely Toxic

W HAT DO YOU THINK THESE SYMBOLS MEAN ? Harmful to the environment

T HE NEXT TWO ARE THE ONES YOU MAY SEE IN YEAR 7

W HAT DO YOU THINK THESE SYMBOLS MEAN ? Corrosive

W HAT DO YOU THINK THESE SYMBOLS MEAN ? Moderate hazard

B UNSEN B URNER Introducing Science

If they are good enough for Hogwarts they are good enough for us!

R OBERT B UNSEN We heat things with a Bunsen burner in the laboratory. Robert Bunsen, a German chemist, invented this apparatus in 1855.

W HAT ARE THE PARTS OF A B UNSEN BURNER ? Label the diagram using these words. air hole chimney collar tubing gas tap chimney air hole collar tubing gas tap

H OW DO WE USE A B UNSEN 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.

T HE B UNSEN FLAME I What will be the colour of the flame when the air hole is closed? This is a luminous flame.

T HE B UNSEN 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.

C HECK POINT Use 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

W HICH 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 10 th 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 times 2.Tie back hair 3.Stand up 4.Tuck in stools and bags 5.Keep desks clear 6.No eating or drinking during practicals You WILL be removed from the practical if you break these rules

H OW TO HEAT AN OBJECT ? (1) The apparatus used in the procedure of heating: What are these? Tripod Bunsen Burner Wire gauze Beaker

H OW 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

H OW TO HEAT AN OBJECT ? (3) 5. Then add water into the beaker 4. Put a beaker onto the wire gauze

W HAT 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

S O 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 GOGGLES Stand up

M EASURING THE TIME TAKEN TO BOIL A CERTAIN AMOUNT OF WATER Fill a beaker with 50 cm 3 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?