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it vapourise from the test tube
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∙ 13y ago
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Consistent temperature can be achieved while heating a test tube by doing what?
Consistent temperature can be achieved by heating a test tube while moving the test tube all around the flame. Do not let only one part of the test tube rest on a flame but instead, keep moving the test tube slowly.
What are two safety rules you should follow when heating liquid in test tubes during an investigation?
1) Hold the test tube using test tube holders. 2) Keep your face and hands away from the mouth of the test tube as vapours (if any) can be harmful and sometimes may cause burns.
Which safety precaution is recommended when a liquid is being heated in a test tube?
Wear goggles and a laboratory apron Hold the test tube with a test tube clamp not in your bare hand. If the liquid is nonflammable it may be heated in the flame of a Bunsen burner, otherwise a hot water bath over a hot plate may be more advisable. If heating in the flame of a Bunsen burner hold the test tube at an angle and move the tube in and out of the cool area of the flame. Alway point the opening of the test tube AWAY from yourself and others.
What happen if heat is applied at the bottom of a test tube containing liquid on it?
You should never point the open end of the test tube when heating liquids toward yourself or others for your own safety. Liquids inside the test tube when heating may release some gases and might affect someone when you point the open end of the test tube to them. when heating the test tubes, position it diagonally and move it slowly sidewards so we can prevent cracking or breaking of the test tubes if directly positioned on fire.
What criterion indicates that you are heating the solution in the test tube with a cool flame?
cool flame is used when you want to maintain your liquid at a constant elevated temp.
What will happen to the liquid in the test tube after heating?
In my idea,it will not boil!!thats all!!
What is most important part of heating a liquid in a test tube?
Heating should be slow.The test tube should not be full.Work in a laboratory hood.
When you are heating materials in a test tube what is very important about the mouth of the test tube?
The most important aspect of heating liquids in a test tube is to never look directly into the mouth of the test tube, as liquid may spurt out and come into contact with your eyes or face. However, if you are wearing plastic safety glasses, the substance may not harm you, depending on the type of substance you are heating.
What hazards are associated with heating a liquid in a test tube that is tightly closed with a cork?
creates pressure
Give the glassware used for direct heating 0.5ml of a liquid?
This is a small test tube or a watch glass.
Consistent temperature can be achieved while heating a test tube by doing what?
Consistent temperature can be achieved by heating a test tube while moving the test tube all around the flame. Do not let only one part of the test tube rest on a flame but instead, keep moving the test tube slowly.
What is the source of liquid droplets seen on the inner upper side of the test tube during the heating process?
Evaporated liquid from the solution (transformed in gas) or gases released by thermal decomposition and condensed in the cooler part of the test tube.
When heating a liquid sample in a test tube the mouth of the test tube should be?
It depends on what you are doing, you should be sure to follow instructions carefully and be sure to take proper safety precautions
When heating liquid in a test tube what safety precautions are needed?
Before heating it, you should check the test tube for damage (scratches or cracks), and not use one that isn't perfect. You should also wear safety glasses (to protect your eyes in case the test tube explodes, which happens sometimes, even when heating water). If you are heating something that could react violently, you should use a blast shield (thick piece of clear plastic).
Why is direct heating of liquid substances in a test tube over the flame prohibited?
Provided that you use the wider kind of tube known as a boiling tube, this is not so. Of course it is dangerous to heat liquids in a narrow tube, as this can cause rapid boiling and the shooting of the liquid out of the tube.
Why is there no convection current when the liquid in the test tube is heated at the top?
because convection currents are caused by the liquid being heated, becoming less dense due to increased kinetic energy and rising. if you are heating the top of the test tube, there is nowhere for them to 'rise' to, so no current is formed, as they do not reach a place where they cool and sink to the bottom. thus convection currents are only formed when heating the bottom of a test tube.
What would you use if you were holding and heating a test tube?
When heating a test tube, you would use a test tube holder. It can also be used to hold/ support pipettes, etc. http://www.answers.com/mt/test-tube-holder
