Tag: laboratory equipments

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Multiple choice common laboratory equipments common laboratory apparatus and equipments laboratory equipments know about some common gases chemistry

Which piece of laboratory equipment is used to make precise measurement of only one volume?

  1. Beaker

  2. Graduated cylinder

  3. Volumetric flask

  4. Test tube

  5. Eudiometer
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Volumetric flasks are used to measure volume of liquids .  The liquid has accurate volume when the solution reaches to the corresponding marking on the scale. Volume is usually indicated in mL. During measurement of the volume the vessel must be placed on an even, horizontal support. The required volume is measured when the lower edge of meniscus of the liquid just touches the marking on the vessel.

Multiple choice common laboratory equipments common laboratory apparatus and equipments laboratory equipments know about some common gases chemistry

Of the equipment listed below, which one would be more suitable to read a meniscus?

  1. $100\ mL$ beaker
  2. $500\ mL$ flask

  3. Watch glass
  4. $50\ mL$ buret

  5. Trough
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Buret is a graduated glass tuble with a top at one end, for delivering volumes of liquid. Since, it is graduated, it is most suitable for reading a meniscus.

A meniscus is basically a liquid seen at the top of a liquid. It can be concave or convex. depending on the surface tension of the liquid and adhesson to the wall of the container..  

Multiple choice common laboratory equipments common laboratory apparatus and equipments laboratory equipments know about some common gases chemistry

Which of the following has a shallow bottom to increase the surface area of a liquid?

  1. Test tube

  2. Burette

  3. Crucible

  4. Evaporating dish

  5. Graduated cylinder
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Evaporating dish has a shallow bottom to increase the surface area of a liquid.
Evaporating dish is used to evaporate volatile solvent from a solution.

Multiple choice common laboratory equipments common laboratory apparatus and equipments laboratory equipments know about some common gases chemistry

Which of the following you will not do in the laboratory while performing an experiment?


i. Pour acids and bases over a sink
ii. Wear goggles
iii. Heat a stoppered test tube

  1. i only

  2. ii only

  3. iii only

  4. i and iii only

  5. i, ii, and iii
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
i.)  Pour acids and bases over a sink- It can be done to avoid cleaning of spill solution and equipment.

ii.) Wear goggles-we should always wear goggles.

iii.) Heating a stoppered test tube can cause the boiling to be extremely sudden, forcing the liquid out of the tube or vapours do not have space for coming out of test tube so it can damage test tube.  

Hence, the correct option is C.
Multiple choice common laboratory equipments common laboratory apparatus and equipments laboratory equipments know about some common gases chemistry

Which of the following would you use to keep a dehydrated substance from rehydrating?

  1. Mortar and Pestle

  2. Beaker

  3. Evaporating dish

  4. Crucible

  5. Desiccator
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Desiccator is used to keep a dehydrated substance from rehydrating.
In desiccator, anhydrous calcium chloride or other suitable dehydrating agent is kept that will remove moisture from atmosphere. Thus, it provides dry atmosphere.

Multiple choice common laboratory equipments common laboratory apparatus and equipments laboratory equipments know about some common gases chemistry

Which piece of laboratory is used to make precise measurements for the volume of a gas collected over water?

  1. Beaker

  2. Graduated cylinder

  3. Volumetric flask

  4. Test tube

  5. Eudiometer
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Graduated cylinder is measuring cylinder used to measure the volume of liquid or gas. It has a narrow cylinderial shap. Each marks as line/graduations in cylinder represents the amount of the liquid or gas that has been measured. Thus, it can be used to make precise measurements for the volume of gas collected over wales.

Multiple choice common laboratory equipments common laboratory apparatus and equipments laboratory equipments know about some common gases chemistry

Which of the following is considered to be a dangerous procedure in the laboratory setting?

  1. Pouring all liquids especially acids and bases. over the sink

  2. Wearing goggles

  3. Pushing glass tubing. thermometers. or glass thistle tubes through a rubber cork

  4. Pointing the mouth of a test tube that is being heated away from you and others

  5. Knowing where the fire extinguisher and eyewash stations are located
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The following is considered to be a dangerous procedure in the laboratory setting
Pushing glass tubing. thermometers. or glass thistle tubes through a rubber cork
During the process, the glass may break and injure our hands.

Multiple choice common laboratory equipments common laboratory apparatus and equipments laboratory equipments know about some common gases chemistry

For which of the following solution we use glass rod to mix them in the chemistry laboratory.

  1. $H _2O$ and $CCl _4$
  2. $H _2O$ and $C _2H _5OH$
  3. $NaCl$ and $H _2O$

  4. All of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

All the given pair of  compounds are miscible and are soluble in each other. Hence, we can use a glass rod to mix them in the chemistry laboratory.