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BlackZzzverrR [31]
4 years ago
6

Which beakers in the model contain solid insoluble substances?

Chemistry
1 answer:
ladessa [460]4 years ago
7 0
Although the models are not provided, I was able to find them and the beakers with solid present in them are:
1C
2A
2C
3A
3C

This is determined by the fact that the beakers all have a piece of closely packed substance laying at the bottom. This closely packed lattice is characteristic of solid substances, and the fact that they exist in the solution in the solid states indicates that they are insoluble.
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In which of the following compounds does the carbonyl stretch in the IR spectrum occur at the lowest wavenumber?
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Answer:

a. Cyclohexanone

Explanation:

The principle of IR technique is based on the <u>vibration of the bonds</u> by using the energy that is in this region of the electromagnetic spectrum. For each bond, there is <em>a specific energy that generates a specific vibration</em>. In this case, you want to study the vibration that is given in the carbonyl group C=O. Which is located around 1700 cm-1.

Now, we must remember that the <u>lower the wavenumber we will have less energy</u>. So, what we should look for in these molecules, is a carbonyl group in which less energy is needed to vibrate since we look for the molecule with a smaller wavenumber.

If we look at the structure of all the molecules we will find that in the last three we have <u>heteroatoms</u> (atoms different to carbon I hydrogen) on the right side of the carbonyl group. These atoms allow the production of <u>resonance structures</u> which makes the molecule more stable. If the molecule is more stable we will need more energy to make it vibrate and therefore greater wavenumbers.

The molecule that fulfills this condition is the <u>cyclohexanone.</u>

See figure 1

I hope it helps!

4 0
4 years ago
Which three types of electromagnetic waves have longer wavelengths than the waves that make up visible light ?
GenaCL600 [577]

On one end of the electromagnetic spectrum are radio waves, which have wavelengths billions of times longer than those of visible light. On the other end of the spectrum are gamma rays, with wavelengths billions of times smaller than those of visible light.

7 0
4 years ago
Read 2 more answers
How many valence electrons does each of the following atoms have?
Zolol [24]
Which atoms?  ~~~~~~~~~~~~~~~~~~~~~~~~~`
6 0
4 years ago
Calculate the number of grams of solute needed to make each of the following solutions:
AleksAgata [21]

Explanation:

(w/w) % : The percentage mass or fraction of mass of the of solute present in total mass of the solution.

w/w\%=\frac{\text{Mass of solute}}{\text{Mass of solution}}\times 100

1) 100 g of 0.500% (w/w) NaI

Mass of solution = 100 g

Mass of solute = x

Required w/w % of solution = 0.500%

0.500\%=\frac{x}{100 g}\times 100

x=\frac{0.500\times 100 g}{100}=0.500 g

0.500 grams of solute needed to make 100 g of 0.500% (w/w) NaI.

2) 250 g of 0.500% (w/w) NaBr

Mass of solution = 250 g

Mass of solute = x

Required w/w % of solution = 0.500%

0.500\%=\frac{x}{250 g}\times 100

x=\frac{0.500\times 250 g}{100}=1.25 g

1.25 grams of solute needed to make 250 g of 0.500% (w/w) NaBr

3) 500 g of 1.25% (w/w) glucose

Mass of solution = 500 g

Mass of solute = x

Required w/w % of solution = 1.25%

1.25\%=\frac{x}{500 g}\times 100

x=\frac{1.25\times 500 g}{100}=6.25 g

6.25 grams of solute needed to make 500 g of 1.25% (w/w) (glucose)

4) 750 g of 2.00% (w/w) sulfuric acid.

Mass of solution = 750 g

Mass of solute = x

Required w/w % of solution = 2.00%

2.00\%=\frac{x}{750 g}\times 100

x=\frac{2.00\times 750 g}{100}=15.0 g

15.0 grams of solute needed to make 750 g of 2.00% (w/w) sulfuric acid.

3 0
3 years ago
A solution of sodium hydroxide was added to a solution of sulfuric acid. How many moles of sodium hydroxide would react with 1 m
lidiya [134]

Answer:

Please mark Brainliest

2 moles

Explanation:

Hope it helped :)

3 0
3 years ago
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