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dem82 [27]
3 years ago
13

Why is it important to cover the developing chamber​

Chemistry
1 answer:
Tom [10]3 years ago
6 0

Answer:A- It is important to keep the developing chamber covered with plastic wrap during the development of the chromatogram so the solvent vapor can saturate the air in the chamber, the solvent does not evaporate and the chromatogram develops properly and shows the correct cations present.

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For the reaction A+2B→C under a given set of conditions, the initial rate is 0.100 M/s.What is Δ[B]/Δt under the same conditions
Oliga [24]

Answer: The rate of disappearance ( -Δ[B]/Δt) under the same conditions is 0.200 M/s.

Explanation:

A+2B\rightarrow C

Initial Rate of the reaction = 0.100 M/s

Rate of disappearance of B:

-\frac{1}{2}\frac{\Delta [B]}{\Delta t}=0.100 M/s

-\frac{\Delta [B]}{\Delta t}=2\times 0.100 M/s=0.200 M/s

The rate of disappearance ( -Δ[B]/Δt) under the same conditions is 0.200 M/s.

6 0
3 years ago
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When atoms are heated, what is also changing?
Norma-Jean [14]
The end result of increased molecular motion is that the object expands and takes up more space. {I don’t know if it’s right, I‘m just trying to help}
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3 years ago
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Predict the missing component of each reaction.<br> ? + 2NaBr → 2NaC1+Brz<br> онСІ<br> ch<br> Na
EastWind [94]

Answer:

Cl2.

Explanation:

? + 2NaBr → 2NaC1l+ Br2

Note that the element Cl (chlorine) is missing from the left side.

The answer is Cl2  (to balance the equation it requires 2 Cl's).

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Amanda [17]
The KE can be solve using the formula:
ke = 0.5 mv^2
where m is the mass of the object
v is the velocity
ke = 0.5 ( 2 kg ) ( 5 m/s)^2
ke = 25 J

the GPE can be solved using the formula:
GPE = mgh
where m is the mass
g is the acceleration due to gravity ( 9.81 m/s^2)
h is the height

GPE = ( 4 kg)(9.81 m/s^2)( 40 m)
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4 0
3 years ago
Identify the reasons that cities boomed during the Middle Ages.
atroni [7]

Answer:

Explanation:

The reasons that cities boomed during the Middle Ages are more employment opportunities, increased trade, and growing interest in culture and art.

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3 years ago
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