Question

Regarding the required safety precautions while working in the biochemistry laboratory, all of the followings are correct actions EXCEPT one? Select one: a. Before using electrical appliances, make sure they are grounded b. The mouth of the glassware containing the solution to be heated should never be pointed toward anyone c. Burners should be used while handling flammable liquids d. If pipetting solutions of strong acids and bases, use either automatic pipettes or pipette pumps e. When diluting concentrated acids, the acid should be poured into the water

          Regarding the required safety precautions while working in the biochemistry laboratory, all of the followings are correct actions EXCEPT one?

Select one:
a. Before using electrical appliances, make sure they are grounded
b. The mouth of the glassware containing the solution to be heated should never be pointed toward anyone
c. Burners should be used while handling flammable liquids
d. If pipetting solutions of strong acids and bases, use either automatic pipettes or pipette pumps
e. When diluting concentrated acids, the acid should be poured into the water

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Regarding the required safety precautions while working in the biochemistry laboratory, all of the followings are correct actions EXCEPT one?

Select one:
a. Before using electrical appliances, make sure they are grounded
b. The mouth of the glassware containing the solution to be heated should never be pointed toward anyone
c. Burners should be used while handling flammable liquids
d. If pipetting solutions of strong acids and bases, use either automatic pipettes or pipette pumps
e. When diluting concentrated acids, the acid should be poured into the water

Added by Michelle S.

Biology for AP Courses

Julianne Zedalis, John Eggebrecht

Instant Answer

Solved by Expert Jennifer Hudspeth

12/30/2021

Step 1

Before using electrical appliances; make sure they are grounded - This is a correct safety precaution. Grounding electrical appliances can prevent electrical shocks. b. The mouth of the glassware containing the solution to be heated should never be pointed toward Show more…

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Regarding the required safety precautions while working in the biochemistry laboratory, all of the followings are correct actions EXCEPT one? Select one: a. Before using electrical appliances, make sure they are grounded b. The mouth of the glassware containing the solution to be heated should never be pointed toward anyone c. Burners should be used while handling flammable liquids d. If pipetting solutions of strong acids and bases, use either automatic pipettes or pipette pumps e. When diluting concentrated acids, the acid should be poured into the water

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Transcript

00:02 Hi there.

00:03 This question lists several safety precautions when working in the lab, and all these are correct except for one of them.

00:11 So let's look at each of these in terms of safety in the lab.

00:20 First of all, letter a.

00:22 Letter a says before using electrical appliances, make sure they are grounded.

00:27 Yes, that is always a good idea, especially since we are frequently working with water and around our sink and using electrical appliances.

00:36 So we definitely want to make sure that these are grounded.

00:40 That is true.

00:42 Letter b, when you are heating an open glassware, heating something in glassware, you always want to make sure you point that open end or the mouth of that glassware away from anyone.

00:55 Because you can get some rapid heating, which may force the liquid to come out of the vessel very rapidly.

01:03 So you don't want that hot liquid spilling on anyone or shooting out at anyone.

01:07 So you always want to point that open end away from everyone.

01:12 All right, letter c, burners should be used for handling flammable liquids.

01:19 That is very false.

01:22 We do not want open flames around flammable substances, flammable liquids.

01:34 This appears to be the one that is not true...

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