what could go wrong in this lab? write a list in the back of your book
TRANSCRIPT
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?