integrated science m1 tools used in science

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BEGINIntegrated Science Module 1 Unit 1Lesson 3a

Integrated Science Module 1 Unit 1Lesson 3a

Some Tools used in ScienceSome Tools used in Science

The BunsenBurner

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Parts of a Bunsen burner


Using a Bunsen burner


Safety Precautions

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In science, it is important to carry out experiments to confirm/develop theories.

Many science experiments need to be carried out in a controlled environment in order to achieve the correct results.

Many experiments need certain equipment to work or to help us make observations, some of which are potential hazards.

This is why in science, we use laboratories that are built in specific ways and contain certain equipment to help lessen hazards.

While working in the lab, there are many different lab apparatus (or ‘tools’) that we use. You will be introduced to some of them in this lesson..

2http://tinyurl.com/mw6nv6c

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This set of slides will help you to be able to: describe safety precautions needed when using a

lit Bunsen burner. identify the parts of a Bunsen burner and state the

function/s of each part. demonstrate the correct procedure in lighting and

using a Bunsen burner. distinguish between the appearance and use of

luminous and non-luminous flames. work amicably together in groups.

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Safety PrecautionsSafety Precautions

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There are many hazards in the science lab. Look out for these hazard symbols in the lab.There are many hazards in the science lab. Look out for these hazard symbols in the lab.

Note also these safety signs and symbols.

Note also these safety signs and symbols.

Harmful Explosive CorrosiveDangerous

for the environment

Flammable Toxic Oxidising Electrical hazard

General Danger

Radioactive Biohazard Poison

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Safety Precautions Safety Precautions While using the Bunsen burnerWhile using the Bunsen burner

A Bunsen burner poses a hazard because when lit, you’re working with fire!

1. Look around the lab now to note the location of: Fire extinguisher/hose, any other fire safety equipment and exit door/s.

2. Watch ‘How to use a portable fire extinguisher’ at > http://www.youtube.com/watch?v=BLjoWjCrDqg

You will learn more about types and uses of fire extinguishers in later lessons.

3. Read aloud and discuss the information on the next two slides with your teacher.

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7http://www.cityu.edu.hk/cse/safety/Safety_training/Course/ppe/ppe_hand.html

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Parts of a Bunsen burnerParts of a Bunsen burner

Robert Bunsen, a German chemist, is said to have invented the Bunsen burner in 1855.

We use this science tool or apparatus as a source of heat when working in the science laboratory.

Get out your Bunsen burner now and use the video below, from start to 2.14, to examine it and to identify the various parts> http://www.jove.com/science-education/5035/introduction-to-the-bunsen-burner (Introduction to the Bunsen burner)

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Activity 2.1: Activity 2.1: What are the parts of a What are the parts of a Bunsen burner?Bunsen burner?

Label the diagram using these words.

air hole chimney collar tubing gas tap

chimney

air hole

collartubing

gas tap

CHECK ANSWERSCHECK ANSWERS

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Parts of a Bunsen burnerParts of a Bunsen burner

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CAUTION ! You’re about to light your burner . Remember … Do not place the burner close to the edge of the lab bench, as knocking it over could start a fire!

Look at your teacher’s

demonstration of the separate parts of a

Bunsen burner. Note how they fit together.

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Using the burnerSteps in lighting the burner

http://alkirascience.wikispaces.com/file/view/SD1+Pages+10+-+11.pdf

1. Continue to watch the same video up to 4.29 > http://www.jove.com/science-education/5035/introduction-to-the-bunsen-burner

2. Also watch > http://www.youtube.com/watch?v=9QpIcX-xw1Q

3. Attach the burner tubing to a gas tap.

4. Close the air hole at the base of the burner.

Now do the following: Click here to animate instructions.

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Using the burnerSteps in lighting the burner

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5. Light a match/splint/lighter and hold it over the chimney.

6. Turn on the gas tap. You should get a flame.

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Using the burner – Activity 3.1: Luminous & non-luminous flames

7. Close the air hole, then slowly open it. Observe the flame.

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Which of these show the colour of the flame when the air hole is closed? When it is open?

http://de.wikipedia.org/wiki/Datei:Bunsen_burner_flame_types_.jpg

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Using the burnerUsing the burnerFlame types Flame types

Feedback : The Bunsen burner that had its valve closed formed the orange-yellow flame of #1, which is a luminous flame or ‘safety flame’ as it can always be seen.

The burner that had its valve open to the maximum, so more oxygen/air was available for complete combustion, formed the blue flame # 4, which is a non-luminous, roaring flame. It is also the hottest flame and it produces little, or no, soot.

Different flame types of a Bunsen burner depend on oxygen supply.

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Using the burnerUsing the burnerFlame types Flame types

The area in which there is intense, complete combustion is where the blue flame is hottest.

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This area of the blue flame, shown by the red arrow, is what we should use when strongly heating containers of substances. This area of the blue flame, shown by the red arrow, is what we should use when strongly heating containers of substances.

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Using the burner Using the burner Flame types Flame types

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AIR HOLE CLOSED = Yellow-orange, luminous ‘safety’ flame

AIR HOLE HALF OPEN = Blue, quiet, non-luminous flame.

AIR HOLE FULLY OPEN = Blue, ‘roaring’ non-luminous flame.

Normal heating is done with an object at the top of the light blue outer cone, while strong heating is done with an object at the top of the bright blue inner cone.

To heat a container gently, move the container back and forth through the outer cone.

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Using the burner: Using the burner: Activity 3.2: Activity 3.2: Heating water on a burnerHeating water on a burner

Check the diagrams below for equipment used for heating/boiling substances such as water on a Bunsen burner.

Set up similar equipment as shown at right. Show your teacher.

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.Tripod stand

BeakerBunsen Burner

Wire gauze

1 . Prepare a Bunsen Burner with blue flame.

2.Put a tripod over the Bunsen Burner.

3.Place a wire gauze onto the tripod.

4.Place a beaker with 50 ml of water onto the wire gauze. Heat the water to boiling.

© EduArt Multimediahttp://www.climatechangematters.net.au/LOTS/Chem/sub/boilingcond/image1.htm

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Using the burnerUsing the burner

It is very important to remember to turn off the gas when not using the burner and disconnect it, allow it to cool, then store the burner in the cupboard.

1. Check now that you’ve done that!

2. Then do the Summary and the Review questions on the next set of slides.

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.

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SUMMARYSUMMARY

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To light a Bunsen burner …. Place the Bunsen burner on a heatproof

mat . Connect the gas hose to the gas tap. Make sure that the air hole is closed. Light the match/splint or lighter. Turn on the gas. Bring the match close to the Bunsen

burner. The flame produced will be yellow (safety flame).

Gradually open the air hole so that the flame will go blue (hottest, roaring flame).

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Review Activity 1 Review Activity 1

Draw a diagram in your notebook that would be part of your lab report to show equipment you set up and used to boil a beaker of water in the science laboratory.

.FeedbackA line drawing like this should be done. It should look like a section cut through the apparatus, so for example, you would not show all three legs of the tripod nor the circular mouth of the beaker. Note an arrow could indicate the heat source, usually from a burner. You should not use colour and a title should be added.

Image modified from > http://www.slideshare.net/giordepasamba/scientific-drawings

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What comments would you make about the way this student uses his burner in the lab?

Feedback

The student is using the burner safely!

1. The students wear a lab coat buttoned up; also wear protective eyeglasses since they’re using fire.

2. The burner is on a heat resistant mat (inferred!).

3. It is also inferred that he is using the hottest, blue flame since it cannot be easily seen as a luminous, yellow flame.

4. The mouth of the tube is turned away from him and his lab partner, so that if hot liquid spurts out, neither will get burned.

5. Neither their clothes nor other equipment/materials are near the burner.

Review Activity 2 Review Activity 2 Think and TellThink and Tell

http://www.shutterstock.com/s/%22bunsen+burner%22/search.html#id=70747255&src=S88ojtQoN2nqFsP_FnUdGg-1-41

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Review Activity 3 Review Activity 3

1. Do the ‘Drag and Drop’ activity at > http://www.echalk.co.uk/Science/practicalSkills/BunsenBurner/DnD/BunsenBurner.html

2. Write the letters to show the correct sequence of steps to follow for lighting a Bunsen burner.

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A B C D E F

Feedback = C, D, B, E, F, A

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Review Activity 4a Review Activity 4a

a. Which kind of flame is hotter?

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Feedback: Flame B is the hotter flame..

Flame A with air hole of

burner closed yellow in colour Incomplete

combustion occurs luminous

Flame B with air hole of

burner opened blue in colour complete

combustion occurs non-luminous

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Review Activity 4b Review Activity 4b

b. Which zone is hottest?

Feedback: Zone B is the hottest area in the flame..

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REFERENCES/CREDITSREFERENCES/CREDITS

http://www.shutterstock.com/s/%22bunsen+burner%22/search.html#id=36172678&src=S88ojtQoN2nqFsP_FnUdGg-1-1

http://www.fotosearch.com/illustration/science-lab.html#comp.asp?recid=57040466&xtra http://www.education.ie/en/Publications/Education-Reports/Safety-in-School-Science.pdf http://chemistry.about.com/od/healthsafety/ig/Laboratory-Safety-Signs/ http://www.cityu.edu.hk/cse/safety/Safety_training/Course/ppe/ppe_hand.html http://de.wikipedia.org/wiki/Datei:Bunsen_burner_flame_types_.jpg http://www.uq.edu.au/_School_Science_Lessons/3.1.4.0ch.GIF http://www.uq.edu.au/_School_Science_Lessons/3.1.4.1ch.GIF http://www.shutterstock.com/s/%22bunsen+burner%22/

search.html#id=1725004&src=S88ojtQoN2nqFsP_FnUdGg-1-27 © EduArt Multimedia

http://www.climatechangematters.net.au/LOTS/Chem/sub/boilingcond/image1.htm http://alkirascience.wikispaces.com/file/view/SD1+Pages+10+-+11.pdf http://www.slideshare.net/giordepasamba/scientific-drawings http://www.shutterstock.com/s/%22bunsen+burner%22/

search.html#id=70747255&src=S88ojtQoN2nqFsP_FnUdGg-1-41 http://www.echalk.co.uk/Science/practicalSkills/BunsenBurner/DnD/BunsenBurner.html

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integrated science m1 tools used in science

Education

bunsen burner parts

lit bunsen burner

bunsen burnerwhile

safety equipment

safety signs

science lab

science experiments

hazard symbols