0
If you heat the test tube from the bottom, any liquid can turn into a gas. ... Heating the tube at an angle reduces the pressure on the heated substances again allowing the gases to escape harmless into the air.
Curtis Strite
Wiki User
∙ 13y agoThe best idea would be to place the test tube in a water bath or oil bath, then heat the bath. Since it takes much greater changes in energy to alter the water or oil temperature, you can very easily keep it at an approximate constant (even using some fairly poor equipment, you'll be able to keep it within the same degree with some care).
Better still to use an appliance that facilitates this, though. Most chemists will use a stirrer hotplate which allows you to choose a temperature level that the equipment will automatically retain. Then use a water bath or oil bath on this hotplate and place the test tube in the bath so you get an even amount of heat applied throughout the test tube.
Wiki User
∙ 14y agoTo distribute the heat more evenly. Heating at only the bottom of the tube results in the liquid at the bottom getting very hot while the liquid at the top remains cool; since test tubes have a small diameter, this can cause "bumping" which is basically the formation of a large bubble at the bottom causing some of the liquid to splash out the top of the tube.
Wiki User
∙ 16y agoIf a test tube is not heated evenly, the glass is likely to crack.
Wiki User
∙ 13y agoso your hand doesn't get burned
Wiki User
∙ 6y agoYou can use a thermostat.
Add your answer:
Earn +20 pts
What are the names for simple science objects?
beaker, funnel, Bunsen burner, heat mat, tube, test tube and more that you can find on the internet.
What is another name for a test tube?
another name for test tube is culture tube or sample tube
How high is 2 mL of water in a test tube?
It depends on what size test tube you are using.
What is contained in a clean dry test tube?
If a test tube is clean and dry, then there should be nothing in it.
How do you dry a test tube?
My best bet would be to heat the test tube to help evaporate the left over water. If for some reason it is a solid, that flush it out with water, then do the first step. The easiest way of drying test tubes would just be by turning it upside down in a test tube holder. Make sure you flush it out with distilled water though to get rid of any residues.
How do you heat a small amount a alcohol in a test tube?
heat the test tube in inclined position..alcohol is a hydrocarbon
Why do we use test tube?
we use test tube to hold chemicals and heat and chemicals.
What is the proper way to heat a liquid in a test tube?
the proper way to heat a liquid in a test tube is by putting it in open flame.
Why do we heat the test tube in a water bath not directly over a flame?
IN Physics wards:Why do we heat test tube in a water bath and not directly over a flame?
In terms of heat conservation how can heat be lost from a hot test tube containing wax?
Heat is transferred by three methods; Convection, conduction or radiation. If the test tube is touching anything (such as the stand or a table) then heat can be lost through conduction; the hot test tube transfers heat to the stand. You can reduce this heat loss by using a material such as wood that does not conduct heat well. The air around the test tube will be heated, and the hot air rises away, allowing cold air to flow around the test tube. The new cold air becomes heated, and rises away and.... This is called convection. Even in a vacuum, the heat of the test tube will be lost through radiation, as the heat of the test tube is transferred to nearby objects. If you put your hand near the test tube, you can feel the heat even without touching it. This is how the heat from the Sun reaches the Earth, even though we're not touching the sun and the 93 million miles of space between us and it is a pretty good vacuum.
Why do we heat the tube in a water bath and not directly over a flame?
IN Physics wards:Why do we heat test tube in a water bath and not directly over a flame?
You are provided with a test tube of water, a piece of wire gauze, an ice cube and a Bunsen burner. Describe an experiment which you can carry out to demonstrate that water is a poor conductor of heat?
Place the ice cube under the wire gauze at the bottom of the test tube. Heat the mouth of the test tube now you can observe the ice cube melting slowly because the heat at the top of the test tube won't move to the bottom but moves higher.
How do you heat a test tube?
You boil some water and put the test tube in and its heated up but you don't have to worry about a flame. You boil some water and put the test tube in and its heated up but you don't have to worry about a flame. To heat a test tube you simply use a Bunsen burner. Make sure you use pliers to hold it with though because it will get very hot. Also you can change the heat of the Bunsen burner by switching it to the blue flame. you always hold it away from you and your lab partner. heat it sideways and slowly run it through the flame to distribute the heat evenly.
What is the material you should look for while buying test tube?
When look to buy a test tube, one should consider the purpose of the test tube. If heat is not an issue for the user, then a plastic one is more than satisfactory. However, the standard lab test tube is primarily made of glass.
Is a test tube glass?
It can be, but you can get plastic ones that you can't heat (or they'd melt!)
Why don't you heat a test tube continuously?
To avoid dangerous tension in the glass.
Why was the test tube held in the flame at a 45 degree angle?
At this angle the biggest "area" of the test tube is covered by the flame. Thus it heats up quickly and evenly. Also, by holding the test tube at 45 degrees away from you, you're less likely to be splashed by anything in the test tube boiling over.
