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3 years ago

What is the primary requirement for a molecule to be analyzed by Gas Chromatography?

Chemistry

2 answers:

Leviafan [203]3 years ago

6 0

Hey there!:

Gas chromatography (GC) is a type of chromatography used for separating compounds that can be vaporized without decomposition. The sample to be analyzed must be able to be vaporized in the system inlet.

So, the correct answer is A.

Hope this thelps!

BabaBlast [244]3 years ago

3 0

Answer:

b) The molecule has a molecular weight under 200 g/mole

Explanation:

The molecule has a molecular weight under 200 g/mole is the primary requirement for a molecule to be analyzed by Gas Chromatography.

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The compound XCl is classified as ionic if X represents the element:

atroni [7]

If the element is a metal with one electron in its outermost energy level.

8 0

3 years ago

The isotope 'Sr has a half-life of 28.8 years. What is the activity, measured in atoms/second, of a 50 mg sample of "Sr? (10 pts

sleet_krkn [62]

Answer:

The activity of 50mg of Sr is $2.63x10^{11} atoms/second$

Explanation:

Every nuclear disintegration follows the first order rate, thus the half-life (t1/2) is $t_{1/2} =\frac{Ln 2}{k}$ where k is the constant of the reaction.

<em>Considering 1 year equals 3.15x107 seconds</em>

$\frac{28.8year x.3.15x10^{7}s }{1 year} = 9.072x10^{8} s$

For Sr with t1/2 = $9.072x10^{8} s$ , the constant of the reaction is

$k =\frac{Ln 2}{t_{1/2}}=\frac{Ln 2}{9.072x10^{8} s } = 7.64x10^{-10} s^{-1}$

The activity (A) of a nucleus is $A = k.N$ where N is the number of nucleus. Sr molecular mass is 87.6g/mol and every mol contains 6.023x1023 atoms, thus

$\frac{50x10^{-3}g x 6.022x10^{23} atoms}{87.6g} = 3.44x10^{20} atoms$

Therefore, the activity of 50mg of Sr is

$A = k.N = 7.64x10^{-10} s^{-1} x 3.44x10^{20}atoms = 2.63x10^{11} atoms/second$

4 0

3 years ago

In an exothermic reaction, energy may be released to the surroundings in the form of?

djverab [1.8K]

Answer:

All of the above

Explanation:

Exothermic reactions release energy usually in the form of heat, but also in a form of light (e.g. a spark, flame, or flash), electricity (e.g. a battery), or sound (e.g. explosion heard when burning hydrogen)

7 0

4 years ago

True or false the amount of water that an object replaces is called displacement.

Maksim231197 [3]

Answer:

false

Explanation:

the amount of water that is replaced by an object is called volume

5 0

3 years ago

Read 2 more answers

How many images will be formed when two plane mirrors are inclined at an angle of 45 degree

insens350 [35]

Answer:

7 Images

Explanation:

n = 360 / a - 1 = 360 / 45 - 1 = 8-1= 7

(Based on multiple reflections)

I hope im right!!

6 0

3 years ago