simple laboratory Gchem questions.

[Danny289]

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here is simple questions about laboratory Chemistry that we don't see very often in SDN.
1- The mass spectrometer may be used:
A) detect the presence of isotope
B) increase the mass of atomic nucli
C) electrolyze water
D) seprate different wavelengths of light
2- the best method of transfering a coarsely-powdered solid to six-inch test tube is to:
A)pour it through thin-stemmed glass funnel
B) pour it from the lip of an evaporating dish
C) pour from the bottle originally containing the solid
D) pour from a creased square of paper

 

[harrygt]

here is simple questions about laboratory Chemistry that we don't see very often in SDN.
1- The mass spectrometer may be used:
A) detect the presence of isotope
B) increase the mass of atomic nucli
C) electrolyze water
D) seprate different wavelengths of light
2- the best method of transfering a coarsely-powdered solid to six-inch test tube is to:
A)pour it through thin-stemmed glass funnel
B) pour it from the lip of an evaporating dish
C) pour from the bottle originally containing the solid
D) pour from a creased square of paper

The second one seems so easy, I hope there is no trick there. I like the first question. We rarely see questions about mass spectroscopy. None of my ochem teachers taught the mass espectroscopy technic, but I always encountered it in my ochem book.

 

[Danny289]

The second one seems so easy, I hope there is no trick there. I like the first question. We rarely see questions about mass spectroscopy. None of my ochem teachers taught the mass espectroscopy technic, but I always encountered it in my ochem book.

nice try harryjan, try one more time, I don't want to say which one is wrong and which on is right. 🙂

 

[Maygyver]

here is simple questions about laboratory Chemistry that we don't see very often in SDN.
1- The mass spectrometer may be used:
A) detect the presence of isotope
B) increase the mass of atomic nucli
C) electrolyze water
D) seprate different wavelengths of light
2- the best method of transfering a coarsely-powdered solid to six-inch test tube is to:
A)pour it through thin-stemmed glass funnel
B) pour it from the lip of an evaporating dish
C) pour from the bottle originally containing the solid
D) pour from a creased square of paper

I'm not sure about 2. At work I just use D 😉 haha A makes the most sense unless the material is too coarse? I dunno.

 

[harrygt]

I'm just deleting my choice [by editting it] so I won't distract others.

 

[IdahoDoc]

here is simple questions about laboratory Chemistry that we don't see very often in SDN.
1- The mass spectrometer may be used:
A) detect the presence of isotope
B) increase the mass of atomic nucli
C) electrolyze water
D) seprate different wavelengths of light
2- the best method of transfering a coarsely-powdered solid to six-inch test tube is to:
A)pour it through thin-stemmed glass funnel
B) pour it from the lip of an evaporating dish
C) pour from the bottle originally containing the solid
D) pour from a creased square of paper

You would do "D" after you weighed it on the balance to get the proper weight.

 

[harrygt]

Ooops, I messed up
I just read that it can help us detect isotopes too!! By the way, it could help us HYDROLYZE water, not electrolyze it.
So, the correct answers are "detect isotopes" and the last choice for the second problem. Can you enlighten us on the second question Danny?

 

[DRHOYA]

Yeah, A is clearly the correct answer for question 1. For question 2, the answer is D. Actually it depends on how much your weighing out. For mg's then you would used creased weighing paper. For grams, you can use a plastic powder funnel. Glass funnels are used to pour in larger amounts of liquids. Also for liquids use a pipette to get fine readings (even readings). During a titration, use a buret to add odd volumes accurately.

 

[Danny289]

here is simple questions about laboratory Chemistry that we don't see very often in SDN.
1- The mass spectrometer may be used:
A) detect the presence of isotope
B) increase the mass of atomic nucli
C) electrolyze water
D) seprate different wavelengths of light
2- the best method of transfering a coarsely-powdered solid to six-inch test tube is to:
A)pour it through thin-stemmed glass funnel is wrong because it is not fine powder
B) pour it from the lip of an evaporating dish
C) pour from the bottle originally containing the solid
D) pour from a creased square of paper

the explanation in some answers is good enough.

 

[DRHOYA]

I should also add that some powders are very static, and can "whip" into the air when transferring a spatula-full...inside the hood. With the hoods open, the air current being drawn in, can whip the powder out and make a mess. To help minimize....close the hood slightly, and you can also use the "zero-stat" (a device that looks like a gun, and when you "fire" it, it locally rids of statics). This is probably wayyyy to much info about transfering powders......but this is what happens when you work in a lab.