Always point a test tube that is being heated
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A test tube is a common piece of laboratory glassware that consists of a finger-like length of glass or clear plastic tubing that is open at the top and closed at the bottom.
Glass is often used in test tubes for general chemical work because of its heat resistance. Expansion-resistant glasses, such as borosilicate glass or fused quartz, can withstand temperatures of several hundred degrees Celsius.
The bottom of a chemistry test tube is usually either flat, circular, or conical. Some test tubes are designed to accommodate a screw cap or a ground glass stopper. A small ground glass or white glaze area near the top is often given for labeling with a pencil.
Chemists use test tubes to handle chemicals, especially for qualitative experiments and assays. Their spherical bottom and vertical sides minimize mass loss during pouring, make them easier to clean, and allow for easy content monitoring. The test tube’s long, narrow neck delays the spread of gases into the atmosphere.
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Any liquid will transform into a gas if the test tube is heated from the bottom. Like a cannon, the gas can quickly expand, firing hot liquid out of the test tube. The heated liquid can cause serious injury, particularly if it comes into contact with another person’s eyes.
Accidents happen, and even gently heating the test tube at an angle will result in heating liquid shooting out. This is why the experimenter must always wear safety glasses and the test tube must be pointed away from any other human.
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Theme-based presentation: “For the sake of science. 1. Always point the open end of a test tube away from people when heating a substance in it. 2. If a laboratory experiment isn’t over,” — Transcript of the presentation:
1. Always point the open end of a test tube away from people when heating a substance in it. 2. If a lab experiment is not done, you can talk to your teacher about it. 3. All chemical wastes should be disposed of according to the instructor’s instructions after an experiment is completed. 4. Ask the instructor if you don’t understand a direction or part of a lab procedure before continuing.
5. If you wear contact lenses in the school laboratory, inform the science teacher. 6. When chemicals, fire, or glassware are used in the laboratory, authorized eye protection devices (such as goggles) are worn. 7. Notify your instructor right away if a lab fire breaks out. 8. Flammable materials, such as alcohol, should never be dispensed or used in close proximity to an open flame.
Heating substances in a test tube
Bunsen burners, you’ve almost definitely used one at some stage in your school career. Bunsen burners are used in science labs to provide a safe heat source for a variety of experiments and tests. Bunsen burners are used in a variety of laboratory settings for heating, sterilizing, and combusting purposes. This information is intended to assist Science Technicians and Teachers in the safe use of a Bunsen burner.
Robert Bunsen invented Bunsen burners in 1855 while working on a new laboratory at the University of Heidelberg. Bunsen’s work necessitated the use of a dependable burner. He built a burner with University Mechanic Peter Desaga that was hot, sootless, and mixed air and gas before combustion. Since then, it has become an integral part of laboratory life.
A Bunsen burner is a staple of science education, and it can be used in a wide range of tests in all fields of science. Check out our fractional distillation experiment to see how you can extract useful, daily fuels, gases, and oils from crude petroleum.