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Why do you hold the stopper from the bottle between your fingers when pouring a liquid?
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What is the use of beaker cover?
A beaker cover is called a rubber stopper or metal stopper(depends on what the stopper is made of).
What is the difference of dropping bottle and reagent bottle?
The reagent bottle is not used for dropping, having only a common stopper.
Why must the glass stopper of a reagent bottle never be placed directly on the laboratory bench?
The stopper of a chemical reagent container should be handled carefully for two reasons. Firstly, it may contain chemical residues which can be dangerous. Additionally, if the stopper is dirtied it may contaminate the reagent in the bottle when the stopper is put back on.
Pouring the reagents to its container?
I'm pretty sure that you hold the reagent bottle by the base. Like the main part of the bottle, veresus the neck or bottom.
How you remove hard sticky label from glass bottle?
One way to get it out is to brace the bottle or have a buddy hold it. Throw two or three loops of cotton string around the neck of the bottle (a shoe lace works well). Holding the ends of the string tight, with a sawing motion, pull the string back and forth.After about 3 to 4 minutes of this, the friction of the string will have heated the neck of the bottle, causing it to expand and release the (colder) stopper. Before you put the stopper back into the bottle, grease it lightly with stopper grease or petroleum jelly. Don't put a cold stopper into a hot bottle.DO NOT USE ANY OTHER METHOD to heat the neck of the bottle. The heat of an open flame, for instance, cannot be controlled and it may cause the bottle to explode or crack.A (quicker) variation is to wet a cloth with water from the hot tap (about as hot as you can stand when you wring it out - but no hotter), and wrap it round the neck of the bottle or decanter.
What is the solid particle retained in the stopper from the bottle between your fingers?
It's called tartar, a crystalline form of tartaric acid (C4H6O6).
What is a bottle stopper?
Decanter
What is cook stopper?
A CORK stopper is a plug for a bottle made of cork
Why a stuck stopper is removed from a bottle by pouring hot water on the bottle's neck?
metal expands due to the rise in heat making it bigger than the actual container (slightly) making it easier to take off
How get glass stopper out of a glass bottle?
Grease the top of the bottle!
What is a wine bottle stopper?
Cork
When glass stopper in a bottle is stuck it may sometimes be loosened by holding the neck of the bottle under a hot water faucet explain the physical principle responsible for this observed phenomenon?
With a few exceptions (notably melting ice) objects expand when heated. If you run hot water on a bottle neck, the heat is applied directly to the bottle and only indirectly to the stopper inside the bottle, so the bottle heats first, and thereby expands sooner than the stopper does. An expanded bottle will exert less pressure on the stopper.
What is the use of beaker cover?
A beaker cover is called a rubber stopper or metal stopper(depends on what the stopper is made of).
Why should we place bottle stopper upside down one the bench?
to avoid contaminating the chemical when the stopper is replaced
What is the difference of dropping bottle and reagent bottle?
The reagent bottle is not used for dropping, having only a common stopper.
How do you get a stock glass stopper out of a bottle?
all you have to do is take the bottle to mars and ask the aliens to open it for you> yeah don't listen to that idiot> you just use pliars to carefully remove the stopper
Why must the glass stopper of a reagent bottle never be placed directly on the laboratory bench?
The stopper of a chemical reagent container should be handled carefully for two reasons. Firstly, it may contain chemical residues which can be dangerous. Additionally, if the stopper is dirtied it may contaminate the reagent in the bottle when the stopper is put back on.
