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How can you practice conservation with conservation with a cracked test tube?
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Why a tightly fitting cork on a test tube is blown off if the test tube is heated?
The air molecules inside the test tube have a higher mobility when heated (they move around more). The collisions between these air molecules create more pressure on the inside of the test tube (force/area, where the force is the result of the increasing collisons and the area is the internal wall of the test tube.) This may result in the pressure inside of the test tube to be greater than the outside atmospheric pressure on the cork (actually atmospheric pressure on the cork and the frictional force on the cork created by the mouth of the test tube). If the internal pressure becomes greater than the external pressure (plus frictional force) the cork will come loose of the test tube.
How would you show that water is not a good conductor of heat?
A test tube is filled with tap water (about 25oC). An ice block is placed in the test tube and is kept at the bottom of the test tube by means of a wire gauze. Next (without delaying too much since the ice block would melt completely!), the test tube is bent and the upper end of the test tube placed in a Bunsen flame. It is found that the water at the upper end boils before the ice block melts. This shows that water is a poor conductor of heat.
What did William Crookes use to test John Dalton's theory?
A tube!
What instrument measures the external and internal diameter of a test tube?
A vernier caliper
What type of simple machine is a test tube holder?
3 rd order lever
What should do with the cracked test tube?
throw it away
Where was the test tube made?
when was test tube first made,when and who?
What are the classifications of test tube?
test tube is classified in to various types namely hard test tube ,boiler test tube,20 ml test tube
What you must do to inspect the drink tube assembly?
perform a tube leak test perform a tube leak test perform a tube leak test perform a tube leak test perform a tube leak test perform a tube leak test perform a tube leak test
What is the source of error when using a test tube?
A test tube (or sample tube) has no errors.
Uses of test tube brush?
Test tube brush=use for cleaning test tubes
What would describe an unsafe laboratory practice?
placing head directly over a test tube to smell it instead of wafting it with your hand.
What is used to grip test tube?
Test tube holder
What is a test tube clamp used for?
Clamping a test tube
Can you place a hot test tube in a test tube rack?
no.
What is test tube stand used for?
to hold the test tube
Heating the liquid in a test tube?
it vapourise from the test tube
