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mariarad [96]
2 years ago
11

Each of four groups of students determined and recorded the melting point of a solid compound. if the actual melting point is 11

3°c, which group had the best precision?

Chemistry
2 answers:
Dmitry [639]2 years ago
4 0

the answer to your question is

Delocalized electrons move freely from atom to atom forming what is known as a sea of electrons. This sea of electrons can absorb part of the impacts avoiding that the structure of the atoms be broken, so the mass of metal is re-shaped in contrast of what happen with the cristal structure of salts, for example.

I goode


Ghella [55]2 years ago
3 0

Answer:

Group 4

Explanation:

Precision means the closeness of repeated measurement.

Accuracy means the closeness of measurement to its true value.

Measurement can be precise but not accurate.

<em>Group 4 measurement has the lowest range which is 110 - 111, hence, they are the most precise in their measurement.</em>

(See the attached image)

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You are performing a simple distillation of roughly 50:50 liquid solution containing two components, hexane and nonane You place
kifflom [539]

Answer:

Explanation:

Refractive index is a undimensional measurement that describes how fast light travels through the material. It is used to see the liquid purity of compounds.

In this problem you have in the beginning a 50:50 solution oh hexane:nonane and realize distillation.

In distillation the collect is enriched with the most volatille substance (hexane). So you will have in the final sample more hexane than nonane.

Assuming the refractive index varies linearly with mole fraction, you will have:

1,375 → 100% hexane

1,407 → 100% nonane

1,385 → ???

molar fraction of hexane:

100 - (1,385 - 1,375) / (1,407 - 1,375) × 100 = 69 %

molar fraction of nonane:

100 - (1,407 - 1,385) / (1,407 - 1,375) × 100 = 31 %

The relation of the distillating fraction is (69:31) of (hexane:nonane)

You can see that distillation is a technique that allows the separation of a liquid mixture, for example.

I hope it helps!

6 0
2 years ago
3. What is the volume of a salt crystal measuring 2.44 x 10-2 m by 1.4 x 10-3 m by 8.4 x 10-3 m?
AlexFokin [52]

Answer:

2.9× 10⁻⁷ m³

Explanation:

Given data:

Measurements of crystal = 2.44 × 10⁻² m by  1.4 × 10⁻³ m by 8.4  × 10⁻³ m

Volume = ?

Solution:

Volume is equal to the length by width by height.

<em>So from given measurement value:</em>

Volume =  2.44 × 10⁻² m by  1.4 × 10⁻³ m by 8.4  × 10⁻³ m

Volume = 2.9× 10⁻⁷ m³

So the volume from given values is 2.9× 10⁻⁷ m³.

8 0
2 years ago
You have 125 g of a certain seasoning and are told that it contains 62.0 g of salt. what is the percentage of salt by mass in th
r-ruslan [8.4K]
62.0g/125g= 0.496 x 100 = 49.6%
4 0
2 years ago
Given the following data, determine the rate constant of the reaction 2NO(g) +Cl2(g) --&gt; 2NOCl(g) Experiment [NO] (M) [Cl2] (
andrew-mc [135]

Answer:

k = 2.647 x 10-2 M-2 s-1

Explanation:

2NO(g) +Cl2(g) --> 2NOCl(g)

Experiment [NO] (M) [Cl2] (M) Rate (M/s)

1 0.0300 0.0100 3.4 x 10-4

2 0.0150 0.0100 8.5 x 10-5

3 0.0150 0.0400 3.4 x 10-4

Frrom experiments 1 and 3;

Reducing the concentration of NO by a factor of 2 decreases the rate of the reaction by a factor of 4. This means the reaction is second order with respect to NO.

From experiments 2 and 3:

Increasing the concentration of Cl2 by a factor of 4 increases the rate by a factor of 4. This means the reaction is first order with respect to Cl2

The rate equation is given as;

Rate = k [NO]² [Cl2]

From experiment 1;

k =  [NO]² [Cl2] / Rate

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k = 2.647 x 10-2 M-2 s-1

7 0
2 years ago
When diluting the pickle juice food sample for titration, is it important to know the final volume exactly? Why or why not?
maks197457 [2]

Explanation:

When diluting a fruit juice, it is important to know the final volume so as not to over dilute the solution.

  • The fruit juice can become too diluted if we don't know the final volume .
  • Concentration refers to the amount of solute dissolved in a solvent.
  • To achieve a desired amount of concentration during dilution, the volume of the target must be known.
  • This will serve as a guide of the amount of solvent to add in order to take the solution to the desired volume.

Learn more:

Dilution brainly.com/question/11493179

#learnwithBrainly

3 0
2 years ago
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