What could go wrong in this lab Write

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

HAZARD WARNINGS 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.

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 gas tap tubing air hole collar

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 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) (b) (c) yellow blue 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?

Remember every piece of neat work should have the following: Today’s date The title in blue or black pen Monday 10 th September 6 Lab safety Rules Underlined with a ruler. Neatly laid out

6 LAB SAFETY RULES 1. 2. 3. 4. 5. 6. Wear goggles at all times Tie back hair Stand up Tuck in stools and bags Keep desks clear No eating or drinking during practicals You 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) 3 Place a wire gauze onto the tripod 2. Put a tripod over the Bunsen Burner 1. Prepare a Bunsen Burner

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? If the beaker is dropped it will smash Heating with a naked flame Heating a hot solution 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

SO SHOULD WE DO? If the beaker is dropped it will smash Don’t pick up the hot beaker. If it breaks tell your teacher. Heating with a naked flame Tie back long hair, tuck in tie. Clear desk Heating a hot solution WEAR GOGGLES Stand up Allow everything to cool before packing away 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

MEASURING 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?