© 2006 plano isd, plano, tx. warmup: what inferences can you make about the pictures on your desk?...


warmup: What inferences can you make about the pictures on

your desk?

Turn in safety contract in baskets


HeatHeat

FireFire

Working with

or


Heat or Fire


When working with heat or fire, you will need to wear safety goggles.

To move hot objects you will need to use the right tongs. Different types of containers use different sets of tongs


1. Use a hot plate when specifically instructed to do so.

2. If you have long hair make sure it is pulled away from your face.

3. Use tongs or heavy gloves to handle hot items.

4. Do not put your face or hands over any boiling liquid.

5. When heating chemicals or other materials, be sure the containers are made of heat proof glass.


6. Never point a heated container at anyone.

7. Keep all materials away from heat sources unless specifically instructed to heat it.

8. Handle hot liquids with care.

9. Turn off a heat source as soon as you are finished with it.

Don’t move it until it has cooled.

Leave a note to indicate that a hot plate has been recently used…it doesn’t look hot.

Bunsen Burner Safety


The laboratory gas burner is designed to heat a small area with a hot flame.

This makes the burner useful for heating glassware such as test tubes and beakers.


1. Never use a heat source without wearing safety goggles.

2. Maintain a clean work area and keep all material away from flames.

3. Never leave a flame unattended; when the burner is not needed, turn it off.

4. Never reach across a flame.

5. Make sure you know how to light the burner correctly.


6. Never heat a liquid in a closed container. The expanding gases produced may blow the container apart, harming you or others.

7. Never pick up a container that has been heated without first holding the back of your hand near it.

8. Always use a mitt, clamp or tongs when handling hot containers.

REMEMBER: Hot glassware looks the same as cool glassware.


Let’s Review! 1. A Bunsen Burner should be used

to heat substances in test tubes.

A = True B = False

2. Wearing goggles is not necessary

when using heat or flame.

A = True B = False


3. Which statement is true?a. Hot glassware always glows red.

b. Only use mitts if holding a hot test tube.

c. Hot and cold glassware looks the same.

d. Tie back hair only if using liquids.


4. These are examples of:

A. Tweezers

B. Tongs

C. Forceps

D. Pinchers


Working with

Electrical Equipment

Electrical Equipment


Electrical Hazard


1. Do not leave electrical cords out where someone might trip over them.

2. Keep cords away from heat and water.

3. Never touch electrical equipment or cords with wet hands.

4. Turn off all equipment when you are finished with the investigation.

5. Grasp the plug when you disconnect your equipment. Do not pull on the cord.


Working with

Sharp ObjectsSharp Objects


Sharp/Pointed Object


1. When cutting, place the object on a flat surface. Do not hold it in your hand while cutting.

2. Always handle sharp instruments carefully. They can cause severe cuts if used incorrectly.

3. Do not walk fast or run with sharp objects in your hands.


Working with

ChemicalsChemicals


When working with chemicals, you will need to wear safety goggles. Regular eyeglasses do not give adequate protection.

Many chemicals require the use of gloves. Check your MSDS or lab write up for the right equipment.


Many chemicals can stain or dissolve fabrics. Aprons should be worn to protect your clothing.

Check your lab write-up or MSDS to determine if tongs are needed to handle containers of chemicals.


1. Never touch, taste, or smell any chemical that you do not know for a fact is harmless. Don’t taste papers such as pH or litmus or any test solutions such as Benedict’s solution.

2. Keep hands away from face, eyes,and body while using solutions.

3. Be sure to use the right chemical. Read the label twice.

4. Do not return excess chemicals back to the reagent bottles or to their original containers.

5. Always pour ACID into WATER.(A&W rootbeer)


6. Label and date all containers that you use to hold chemicals.

Use a pencil to mark the white patch found on many pieces of glassware. Erase the marks when you are finished.

If there is no white patch, a black china marker should be used.

7. Keep combustible materials away from open flames (alcohol and acetone are combustible.)


8. If the instructions include to note the fumes in an experiment, always gently wave your hand over the opening of a container and direct the fumes toward your nose. This is called wafting.

9. Do not use the same spatula to remove chemicals from two containers.

10.Replace all stoppers and caps on the bottle as soon as you are finished using it.When inserting glass tubing into a rubber stopper push with the palm of your hand.


Many chemicals that you use are classified as toxic.

Toxic substances are poisonous.

The toxic substance can be a chemical or a toxin produced by a plant, animal, or pathogenic bacteria.


Corrosive Substance


Corrosive chemicals are substances that, by direct contact, cause injury to body tissue.

The injury may be slight causing a minor burn

or irritation or it may be severe enough to destroy body tissue.

The chemical action that occurs will depend on

the chemical properties of the substance.


1. Acids and bases react easily with other substances.

2. If you get an acid or a base on your clothes or your skin, notify your teacher immediately.

3. Pour acids and bases over the sink, not the counter top.

4. If you need to combine an acid or a base with water, always add acids and bases to water NOT the other way around.


GlasswareGlassware

Working with


1. When heating glassware, use a wire or ceramic screen to protect glass ware from the flame of a Bunsen burner.

2. Never use broken or chipped glassware. Dispose of broken glassware in the designated location.

3. Never eat or drink from laboratory glassware.


5. Corrosive materials

A. Can cause damage to the skin

B. Are not usually harmful

C. Are never in solid form

D. Won’t be found in your school

More review!!


6. Which statement is correct?• Never touch, taste, or smell any chemical that

you do not know for a fact is harmless.• Keep hands away from face, eyes, and body

while using solutions.• Don’t taste papers such as pH or litmus or

any test solutions such as Benedict’s solution.• Be sure to use the right chemical. Reading the

label once will be ok. Trust your instincts!


7. When using sharp objects

• A. Always cut toward yourself

• B. Always cut away from your body

• C. Use your teeth as much as possible

• D. Have your lab partner cut everything


8. Which statement is false?

• Do not leave electrical cords out where someone might trip over them.

• Keep cords away from heat and water. • It’s ok to touch electrical equipment or

cords with wet hands.• Grasp the plug when you disconnect

your equipment. Do not pull on the cord.


9. This symbol indicates

A. You may be using heat.B. You may be using chemicals.C. You may be using corrosive materials.D. All of the above.


10. A = True B = False

• Using chipped or cracked glassware is ok as long as the glassware will not be heated.


Final Reminders

Final Reminders


Always follow your teacher’s instructions when:

modifying all lab procedures as needed.

performing activities outside of the lab procedure.

when an injury occurs.

throwing away chemicals and other materials.

cleaning up spilled materials.

cleaning up broken glassware.


NoNo Horseplay or Fooling around in the laboratory!


LaborLabor+Oratory=

Laboratory

(Work-then talk about your work!)


Color & label in spiral

• What is this?• The NFPA CODE

• What is it used for?• Labeling chemicals of

any precautions or hazards.

Flammability

stability

health

Special information

© 2006 plano isd, plano, tx. warmup: what inferences can you make about the pictures on your desk?...

Documents