- Why do you waft in chemistry?
- When you smell a chemical you should waft the odor?
- How do you use waft vapors?
- How far from your nose should you hold the chemical you wish to waft?
- Do you need to shake a lab thermometer?
- What happens if you smell a chemical?
- When you are finished using a Bunsen burner you should?
- Why should a thermometer never be used to stir a liquid?
- Do mercury thermometers lose accuracy?
- Why should the match be light before turning on the gas?
- Why should you use a hot plate instead of a Bunsen burner when flammable chemicals are present in a chemistry lab?
- Can a mercury thermometer be wrong?
- Which is more accurate mercury thermometer or digital?
- Why should you not stir the solution with a thermometer what should be used?
- When calibrating a thermometer it must register quizlet?
Why do you waft in chemistry?
Wafting may be used for everyday substances, to make sure they are fresh, or consumable. This method allows for a lower concentration of vapors to be inhaled and is particularly useful in safely smelling ammonia, hydrochloric acid, and other dangerous or unpleasant chemicals.
When you smell a chemical you should waft the odor?
If you need to smell the odor of a chemical, waft or fan the fumes toward your nose with one hand. Do not put your nose over the container and inhale the fumes.
How do you use waft vapors?
0:140:41How to Waft Vapors – YouTubeYouTubeStart of suggested clipEnd of suggested clipSo what you’re going to do is take a test tube. Keep it away from your face take a deep breath inMoreSo what you’re going to do is take a test tube. Keep it away from your face take a deep breath in and hold it. And then you’re going to bring the test tube base level about 6 to 9 inches away.
How far from your nose should you hold the chemical you wish to waft?
The subject should keep the oil at a consistent distance (about 30 cm) from his/ her nose with his/her mouth closed. Figure 5. Demonstration of the wafting procedure.
Do you need to shake a lab thermometer?
Do not “shake down” thermometers or use it as a stirring rod. Thermometers break easily. You must ask for help in cleaning up broken thermometers in order to prevent mercury contamination in the lab.
What happens if you smell a chemical?
Exposure to odors could result in health effects ranging from none, to mild discomfort, to more serious symptoms. Some chemicals with strong odors may cause eye, nose, throat or lung irritation. Strong odors may cause some people to feel a burning sensation that leads to coughing, wheezing or other breathing problems.
When you are finished using a Bunsen burner you should?
When you are finished using a bunsen burner you should:Leave it on for the next person to use. It’s the only considerate choice.Cover the burner with an inverted beaker to suffocate the flame.Pull off the hose connecting the burner to the gas. The burner won’t have gas, so it won’t be on fire.Turn off the gas. Duh!Jul 3, 2019
Why should a thermometer never be used to stir a liquid?
If the thermometer bulb touches the container, the temperature of the glass will be measured instead of the temperature of the solution. Readings may be incorrect, particularly if the flask is on a hotplate or in an ice bath. Stirring the solution provides a better representation of the entire solution.
Do mercury thermometers lose accuracy?
Do mercury thermometers lose accuracy over time? Mercury thermometers cannot be adjusted after calibration. The actual temperature must be calculated by applying corrections to the measured temperature. This takes time and is susceptible to calculation error.
Why should the match be light before turning on the gas?
Once your teacher has checked all of the Bunsen burners he will turn on the main gas supply. When you light a match always strike it away from you. Make sure that your match is alight before you turn your gas tap to the ‘on’ position. The more the air holes are open, the more fierce the Bunsen flame.
Why should you use a hot plate instead of a Bunsen burner when flammable chemicals are present in a chemistry lab?
Hot plates are simple electrical appliances used to heat samples within the air. Hot plates are generally used when the desired temperature is above 100 degrees Celsius (212 degrees Fahrenheit) and are regarded to be much safer than open-flame heaters such as Bunsen burners.
Can a mercury thermometer be wrong?
Mercury thermometer are extremely repeatable and accurate over many years. You could put a working mercury thermometer in a time capsule and bury it for 10,000 years and it would still be working accurately. As long as the glass has not been cracked it will continue to function accurately.
Which is more accurate mercury thermometer or digital?
Both laboratory and clinical studies show that there is no significant difference in the average accuracy of the two types of thermometers, however there is a greater fluctuation of readings of temperature when using electronic thermometers.
Why should you not stir the solution with a thermometer what should be used?
Suspend the reservoir (the tip) of the thermometer below the surface of the solution, but do not allow the tip to touch the walls or bottom of the container. Stirring ensures that the temperature gradients are minimized (that ‘hot’ or ‘cold’ spots in the solution are not measured).
When calibrating a thermometer it must register quizlet?
Terms in this set (10)Bring water to a boil.Submerge the sensing area of the thermometer stem or probe in the water for 30 sec.Hold the calibration but and rotate the thermometer head until it reads 212 degrees f.