STEPS TO LIGHT BUNSEN BURNER:
- Check connections to burner and desk outlet valve.
- Close needle valve and collar.
- Open desk outlet valve fully.
- Open needle valve 1/2 turn.
- Use the spark lighter to light the flame.
- Adjust collar and needle valve till you see a blue flame.
Which of the following are correct safety points when using a Bunsen burner more than one answer may be correct?
SAFETY: Which of the following are correct safety points when using a Bunsen burner? More than one answer may be correct. SAFETY: Old tubing that has become cracked should be replaced before the Bunsen burner is lit.
How do you protect your eyes with a Bunsen burner?
Wear eye protection. Place the Bunsen burner on a heat-resistant mat 30 to 40 cm from the edge of the bench. Make sure the air hole is closed (unless you are lighting the gas with a piezo-electric lighter, in which case air hole should be half open).
When lighting a Bunsen burner you should?
Lighting Bunsen Burner: Close needle valve and collar. Open gas valve fully. Open needle valve 1/2 turn. Use the spark/lighter to light the flame.
Why must the methane be mixed with the air in the barrel before it is burned?
The Bunsen burner uses the combustion of methane (also called natural gas) and oxygen according to Equation 1 to produce heat. Mixing air with the gas before combustion ensures that enough oxygen will be available and complete combustion will occur.
What procedure is safest to follow when using an open flame?
Answer: Cork the test tube and then heat it gently near the bottom only. Explanation: If the contents of the test tube is flammable, then it can catch fire easily at any time.
What are three major safety rules you should follow when working with open flames?
Personal Safety Participants with long hair should secure it away from the face so it doesn’t fall down into the flame. Remove any long jewelry that might reach the flame. Safety gear is also key. Wear goggles when using the flame, especially if you’re heating a glass container or using chemicals.
Why should you close the air holes of the burner when lighting the burner?
When lighting a Bunsen burner, start with the air holes mostly closed. The flame will be yellow and not very stable. It will waver with and air movement like a candle. Slowly open the air holes until the flame turns blue.
When should you tie back long hair or baggy clothing?
Safety Quiz
| Question | Answer |
|---|---|
| You should tie back long hair and/or baggy clothes when: | working in the lab |
| When should you be sure equipment is clean: | Before and after use. |
| A spill can cause an accident. Clean up a spill: | Immediately |
| In the lab sharp object should be carried | With the point down and away from the body. |
How do you control the height of the flame?
Adjusting the Flame. Use the needle valve to control the flame’s size. The needle valve on the bottom of the Bunsen burner adjusts the gas flow rate, which determines the height of the flame. More gas will create a larger flame, and less gas gives you a smaller flame.
What happens to the flame when you increase the air flow?
Increasing the air flow to the burner produces more complete combustion and a hotter flame. The air is increased by opening up the air vent (turning the metal collar). Sometimes when the air flow is being adjusted, the flame may “blow out.” If this happens, simply turn off the gas and close the air vent.
When using a open flame in a lab students should never?
Do not leave open flames unattended and never leave the laboratory while the burner is on. Shut off gas when its use is complete. Allow the burner to cool before handling. Ensure that the main gas valve is off before leaving the laboratory.
What precautions should you take if you work with alcohol and an open flame in the laboratory?
Wear indirectly vented chemical splash goggles, chemical resistant aprons or lab coats and chemical resistant gloves. Methanol and other alcohols are toxic-avoid inhalation and skin absorption.
What is the color of the flame when the air inlet holes are closed?
The flame when the air-hole is open is blue, luminous, and clean. When the air-hole is closed, however, there is less oxygen available. This results in incomplete combustion of the gas. The color of the flame changes to yellow and the flame is wavy.
Why should you never leave an experiment unattended?
Equipment and experiments that run unattended during the day and overnight have the potential of causing significant problems and harm to University personnel, facilities, and equipment.
Should you ever leave your experiment unattended?
Sometimes it is necessary for experimental apparatus to be left unattended. Other lab members should also be made aware of experiment conditions so they can assist GTPD, Atlanta Fire, or EHS during a response. Not all experiments can be left unattended due to their highly hazardous nature and EHS should be consulted.
Which of the following are correct safety points when using a Bunsen burner quizlet?
Terms in this set (14) Always light the match or lighter before turning on the gas. Always follow proper procedures for lighting and using a Bunsen burner (see procedure). Use tongs when holding objects in a flame. Never leave a lit Bunsen burner unattended.
Why is the safety flame not good for heating?
To light the burner and when it is not being used to heat anything because is easy to see and will not readily set fire to clothing etc. This flame is unsuitable for heating as it coats surfaces with soot (carbon).
Which direction should the striker face as you are trying to light the Bunsen burner?
To light the burner, turn on the gas at the source – all the way. Open the needle valve approximately one-quarter to one-half turn. Bring the striker to the side and just above the top of the barrel.
What colour flame is dangerous?
The yellow colour comes from the soot particles produced by the flame. Yellow or red flames only burn at around 1,000 degrees C. This flame is dangerous as it produces more poisonous carbon monoxide gas.
Which type of flame is good for heating?
A blue flame provides more heat and higher temperature compared to the yellow flame. Why is luminous flame not suitable for heating? All of the carbon that gets used can be turned into CO2, so there’s actually no soot.
