How should you protect your eyes from chemicals and glass shards?
How should you protect your eye from chemicals and glass shards? Wear goggles with side shields. Why is it important to remove jewelry, watches and contacts before working in the lab? They can trap corrosive chemicals on skin, ruin jewelry and contacts can trap vapors against eyes.
Which protection is best suited for eye and face together?
Use face shields in combination with safety spectacles or goggles, even in the absence of dust or potential splashes, for additional protection beyond that offered by spectacles or goggles alone….Plastic Windows:
- Protect against light impact.
- May include a glass insert.
- Are available clear or filtered.
What is a safe way to read a burette that is above your eye level group of answer choices?
Lab Safety Quiz
| Question | Answer |
|---|---|
| What is a safe way to read a burette that is above your eye level? | Lower it to your level or heighten yourself to its level by a stool |
| Is the lab a safe place to eat/drink/apply makeup, why? | No, because chemicals can contaminate it |
Why are burette readings taken from the top of the meniscus?
The curved surface at the top of the liquid level is called a meniscus. You read the liquid level using the bottom of the meniscus. Therefore the amount of liquid delivered will be the same regardless of the background, as long as the background is kept constant.
Which is the correct position to carry a long glass tube to prevent breakage?
Carry glass tubing and glass thermometers only in an upright position.
What safety precautions should you use when working with a heat source?
1) Turn off heat sources when they are not in use. 2) Point test tubes away from yourself and others when heating substances in them. 3) Use the proper procedures when lighting a Bunsen burner. 4) To avoid burns, do not handle heated glassware or materials directly.
Which safety precaution is recommended when a liquid is being heated in a test tube?
Which safety precaution is recommended when a liquid is being heated in a test tube? When holding the test tube, keep fingers closest to the open end of the tube. Direct the flame of the burner into the open end of the test tube.
What is the proper way of heating chemicals?
Some heating methods are safe to use on certain chemicals, and potentially dangerous to use on others….Possible heating methods include:
- Steam Bath.
- Bunsen Burner.
- Hot Water Bath.
- Sand Bath.
- Oil Bath.
- Hot Plate.
- Heating Mantle.
- Heating Blankets.
What is important to remember while you are using heat?
What is important to remember while you are using heat? Do not heat closed containers. Point the mouth of the container away from yourself and classmates. Always use clamps to hold the container.
Where should test tubes be properly disposed?
Glass test tubes must be discarded in the racks provided in the test-tube wastebasket located at the back of the lab. 4. Paper towels and gloves that are not contaminated can be discarded in the regular, black Trash can at the front of the lab.
When heating a liquid or solution in a test tube over an open flame?
Always ensure that the mouth of the test tube is pointed away from you and any others around you in the lab. Put the test tube into the hottest part of the flame. While heating, move the test tube from side to side. Do not put the test tube directly into the flame!
What is the difference between test tube and boiling tube?
Test tubes are convenient containers for heating small amounts of liquids or solids with a Bunsen burner or alcohol burner. A boiling tube is a large test tube intended specifically for boiling liquids.
Why is putting stoppers in test tubes dangerous?
Also, never stopper or plug a test tube that contains any mixture that will release gases (e.g., acetic acid + sodium bicarbonate). Pressure buildup can cause bursting of the tube or ejection of the stopper, leading to injury.
How do you heat liquids?
Basically, there are three methods for heating liquids: Firstly, direct heating by flange heaters, screw-in heaters or flow-type heaters, secondly, heating by a heating medium, i.e. by heat exchangers, and thirdly, direct heating, i.e. a combination of the first and second one.
What device is best for heating a volatile liquid?
Bunsen Burners A Bunsen burner is conventional and convenient means for heating of liquids in test tubes and small beakers. However, a naked flame can lead to fires and explosions if such heating is carried out in close proximity of flammable liquids or explosive materials.
What is heating method?
Methods of electric heating include resistance heating, electric arc heating, induction heating, and dielectric heating. In other processes, heat is produced within the workpiece by induction or dielectric losses. As well, heat can be produced then transferred to the work by conduction, convection or radiation.
Is it safe to microwave liquids?
It’s also important to be careful when heating liquids. There’s a slight possibility that overheated liquids may explode out of their container and burn you. Never heat baby formula or any food or beverage intended for small children in a microwave due to the risk of scald burns.
Why you shouldn’t boil water in the microwave?
This is because water heated in a microwave oven can be heated above its normal boiling point (superheated). This will cause water to boil vigorously and explode out its container. The water can also explode if you add a powder, such as coffee, or an object to stir it.
Which heating system is best?
Gas boilers are only 90% efficient. So the most efficient heating system is electric. Yet, mains gas provides the most cost effective heating.
What is the best way to heat a house with electricity?
Electric Options
- Infrared Heating Panels. If you can’t use gas and can’t install a heat pump or biomass boiler for whatever reason, then infrared heating panels are the cheapest way of heating your home.
- Storage Heaters.
- Heat Pumps.
- Biomass.
- Solar Thermal.
- Solar PV.
Is it cheaper to have heating on low all day?
This is a hotly debated one. According to experts at the Energy Saving Trust, the idea it’s cheaper to leave the heating on low all day is a myth. The Energy Saving Trust says if you’re keeping the heating on all day you’re losing energy all day, so it’s better to heat your home only when you need it.