- 1 Why is it important to use a glass stir rod instead of a metal one?
- 2 Why glass rod is used in decantation?
- 3 What is a beaker used for in a science lab?
- 4 Why is it okay to stir with a glass rod but not with the thermometer?
- 5 What is the difference between glass tube and glass rod?
- 6 What do you call the liquid obtained from decantation?
- 7 What is the use of glass rod in transferring liquid?
- 8 How do you make glass disappear?
- 9 Why is it important to know the use of laboratory tools and equipment give at least two reasons?
- 10 What lab equipment is used for heating a small amount of substance?
- 11 What are the 20 laboratory apparatus and their uses?
- 12 Why should you never stir with a thermometer?
- 13 Is glass rod a conductor?
- 14 What is Ebonite Rod?
Why is it important to use a glass stir rod instead of a metal one?
Stirring rods are important because stirring a solution, which is also known as agitation, causes a reaction to happen faster. Glass rods are also used to spread liquid substances on a solid surface. It is preferable to a metal rod because glass is not a good conductor of heat and metal is. Metal has free electrons.
Why glass rod is used in decantation?
Use of glass rod during decantation of a liquid ensures that the liquid to be poured does not stick to the walls of the glassware and is directly poured into it without any spillage and spatter. It is useful during pouring of reactive chemicals.
What is a beaker used for in a science lab?
Beakers are often used to hold, mix, and heat reagents. Most have a small lip for pouring liquids. Test tubes, which are relatively small cylindrical vessels, are also used to store, heat, and mix chemicals.
Why is it okay to stir with a glass rod but not with the thermometer?
Never use a thermometer to stir, use a glass rod or metal spatula instead. Boiling stones or a boiling stick can be used in many cases to ease evaporation, as they provide a place for bubbles to form and diminish the chances of a liquid to superheat.
What is the difference between glass tube and glass rod?
Glass tube and rod is a raw or semi-finished stock material that is used to form other components or systems. Glass gobs are softened or melted and then formed (drawn) or extruded into tube or rod shapes. Rods or tubes can have round, square or specialized shapes.
What do you call the liquid obtained from decantation?
Plasma can be separated from blood through decantation by using a centrifuge. Mercury is disposed of in water bodies during mining, turning the water unfit and toxic.
What is the use of glass rod in transferring liquid?
Answer: Glass rods are used when pouring liquids in order to avoid spills. When a glass rod is laid against the pouring edge of a beaker, it causes the liquid inside to flow along the rod and down into the receiving vessel instead of splashing over the lip.
How do you make glass disappear?
Fill one glass with water, one with vegetable oil and one with half vegetable oil and half water. 4. Immerse a glass item, such as a test tube or glass stirring rod in the glass of water. Repeat with the vegetable oil and then the glass with half oil/half water.
Why is it important to know the use of laboratory tools and equipment give at least two reasons?
Science can be fun but it can also be dangerous because you can be working with any kind of objects, chemicals, or minerals that may be able to harm you or someone else. You must know your lab equipment and how to use it for not only your experiment but also faults that may occur during or after the experiment.
What lab equipment is used for heating a small amount of substance?
Bunsen burner – The Bunsen burner is a metal tube that produces a flame from gas such as methane, propane, or butane. It is used in the lab for heating and sterilizing. The Bunsen burner is named after German chemist Robert Bunsen.
What are the 20 laboratory apparatus and their uses?
20 common School Science laboratory equipment and their uses?
- Microscope: A microscope is a very basic and needful equipment of biology laboratory.
- Test tubes: The next very common apparatus are the test tubes.
- Magnifying glass:
- Volumetric flask:
- Bunsen burner:
Why should you never stir with a thermometer?
Mercury is a dangerous substance that can be hazardous to your health if are in contact with it. Thermometers are very fragile and must be handled with care. Never use a thermometer to stir a liquid.
Is glass rod a conductor?
Because the glass rod is an insulator, it must actually touch the electroscope to transfer charge to or from it. (Note that the extra positive charges reside on the surface of the glass rod as a result of rubbing it with silk before starting the experiment.)
What is Ebonite Rod?
Ebonite rod is a rod made by special vulcanized rubber. The electrons in fur are less tightly bound than electrons in ebonite and hence ebonite gets a negative charge. The charge on ebonite rod is negative and the charge on fur is positive.