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3 years ago

Compare and contrast the properties of charcoal and carbon dioxide

2 answers:

4 0

Carbon and Oxygen both are on the second period, therefore, they both have two energy shells.- Carbon's atomic number is 6, and Oxygen's atomic number is 8. So Carbon has 6 protons and electrons, and Oxygen has 8 protons and electrons.- Carbon's atomic mass (or mass number) is 12, and Oxygen's atomic mass is 16.- Carbon has 6 neutrons, and Oxygen has 8 neutrons.- Carbon can be black, while Oxygen is clear and odorless.

SpyIntel [72]3 years ago

3 0

Answer:

Carbon dioxide is a gas that is invisible. It plays a significant role by being one of the most effective green house gas. Earth's atmosphere is comprised of about 0.03% of Carbon dioxide (CO₂) and a small increase in this concentration can lead to an adverse effect, thereby causing global warming.

Whereas, charcoal is a dark grayish colored residual product of carbon which is obtained after the withdrawing the water and volatile components of organisms as well as plant materials. Burning of charcoal produces carbon dioxide. It is used for various purposes such as cooking fuel, industrial fuel, skin care as well as whitening of teeth.

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Part C Number of molecules in 8.437x10-2 mol C6H6

N76 [4]

Answer:

There are $5.08\times 10^{22}\ \text{molecules of}\ C_6H_6$

Explanation:

In this problem, we need to find the number of molecules in $8.437\times 10^{-2}$ mol of $C_6H_6$ .

The molar mass of $C_6H_6$ is $6\times 12+1\times 6=78\ g/mol$

No of moles = mass/molar mass

We can find mass from above formula.

$m=n\times M\\\\m=8.437\times 10^{-2}\ mol\times 78\ g/mol\\\\m=6.58\ g$

Also,

No of moles = no of molecules/Avogadro number

$N=n\times N_A\\\\N=8.437\times 10^{-2}\times 6.023\times 10^{23}\\\\N=5.08\times 10^{22}\ \text{molecules}$

Hence, there are $5.08\times 10^{22}\ \text{molecules of}\ C_6H_6$

5 0

3 years ago

What is the mass number of an ion with 107 electrons, 157 neutrons, and a 1 charge?

Oksi-84 [34.3K]

265
your answer would be 265. Because the charge of +1 means there is one more proton then electron. So, 108 protons plus 157 neutrons gives you your mass number of 265.

4 0

3 years ago

Which one of the following reactions would produce t-butyl methyl ether in high yield?

swat32

Answer:

D) sodium t-butoxide + bromomethane

Explanation:

The alkoxide ion is a strong nucleophile, that unlike alcohols, will react with primary alkyl halides to form ether. This general reaction is known as the Williamson synthesis, and is a SN₂ displacement. The alkyl halide must be primary so the back side attack is not hindered, and the alkoxide ion must be formed with the most hindered group.

The mechanism can be seen in the attachment.

7 0

3 years ago

When a strong acid is titrated with a strong base using phenolphthalein, the color changes suddenly at the end point. The color

larisa86 [58]

Answer:

Keto - enol tautomerism

Explanation:

Phenolphthalein is an organic molecule (formula: C20H14O4), which is used in to determine the final volume in an acid-base titration, this is, as the molecule changes from one to another color, depending on the Ph of the solution (in acids solution, the molecule remains colorless, while in basics solutions it remains pink) :

The molecule of phenolphthalein is a week acid, which losses a proton (H+) when it´s in solution: the undissociated molecule is colorless, while the correspondent anion (without a H+) is pink. This may be simplified with the following reaction:

H₃In⁺ ⇄ H₂In (colorless) ⇄ In⁻² (pink) ⇄ In(OH) ⁻³

- When adding a base (for example, NaOH) to phenolphthalein (initially, a colorless solution), molecule losses one H⁺ and we obtain In⁻², which is pink

- When adding an acid, the original structured is recovered, so color turns from pink to colorless

This change color is not only explained with adding an acid or a base, but also with phenolphthalein structure, that leads to a keto-enol tautomerism: as molecule has 2 hydroxyl groups (- OH) and 1 carbonyl group (C = O), compounds with this structure have an equilibrium between both groups:

R1 = C H– OH ⇄ R1 – C = O

With this change, phenolphthalein structure changes and hence, color solution changes as well

4 0

3 years ago

I need help please with this chemistry work

Marysya12 [62]

Answer:

question 1: 3

question 2: the number of Valence electrons in the atom

hope it helps

8 0

3 years ago