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2 years ago

Diamonds and graphite are two forms of what nonmetal?.

Chemistry

2 answers:

stich3 [128]2 years ago

4 0

Answer:

Diamond and graphite are allotropes of carbon

Explanation:

» Diamond has tetrahedral edges associating through weaker vander waal forces of attraction, it is colorless and glittering, and it is very hard.

» Graphite has hexagonal edges associating vander waal forces, it is black in color and it is soft. Example of graphite is the black rod in a dry cell.

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GuDViN [60]2 years ago

3 0

Answer:

<h2>Carbon Atoms</h2>

Explanation: Diamond and graphite are made out of carbon atoms. The difference between the two substance is the arrangement of the carbon atoms inside each one.

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The molar absorptivity for aqueous solutions of phenol at 211 nm is 6.17x103L/mol/cm. Calculate the linear range of phenol conce

Scilla [17]

Explanation:

The given data is as follows.

$\lambda$ = 211 nm, $\sum = 6.17 \times 10^{3} mol/L/cm$

l = 1 cm, 7% < Transmittance < 85%

Suppose the aqueous solution follows Lambert-Beer's law. Therefore,

Absorbance = $-log \frac{\text{Percentage transmittance}}{100}$

Hence, for 7% transmittance the value of absorbance will be as follows.

Absorbance = $-log \frac{7}{100}$

$A_{1}$ = 1.155

For 85% transmittance the value of absorbance will be as follows.

Absorbance = $-log \frac{85}{100}$

$A_{2}$ = 0.07058

According to Lambert-Beer's law.

A = $\sum \times l \times C$

where, A = absorbance

$\sum$ = molar extinction coefficient

C = concentration

Therefore, concentration for 7% absorbance is as follows.

$A_{1} = \sum \times l \times C_{1}$

$C_{1}$ = $\frac{1.155}{6.17 \times 10^{3} \times 1}$

= $0.187 \times 10^{-3} mol/L$

= 0.187 mmol/L

Concentration for 85% absorbance is as follows.

$A_{2} = \sum \times l \times C_{2}$

$C_{2}$ = $\frac{0.07058}{6.17 \times 10^{3} \times 1}$

= $0.01144 \times 10^{-3} mol/L$

= 0.01144 mmol/L

Thus, we can conclude that linear range of phenol concentration is 0.01144 mmol/L to 0.187 mmol/L.

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2 years ago

Determine la fórmula empírica de un compuesto que contiene:

ycow [4]

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2 years ago

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goldfiish [28.3K]

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3 years ago

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The mass of an atomic number best refers to the number of

adelina 88 [10]

Answer:

Mass number

Explanation:

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2 years ago

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Acetylene gas (c2h2) reacts with oxygen gas (o2) to produce carbon dioxide (co2) and water vapor (h2o). how many liters of c2h2

MissTica

According to the balanced equation of the reaction:

2C2H2 + 5O2 → 4CO2 + 2H2O

So we can mention all as liters,

A) as we see that 2 liters of C2H2 react with 5 liters of oxygen to produce 4 liters of CO4 and 2 liters of H2O

So, when we have 75L of CO2

and when we have 2 L of C2H2 reacts and gives 4 L of CO2

2C2H2 → 4CO2

∴ The volume of C2H2 required is:

= 75L / 2

= 37.5 L

B) and, when we have 75 L of CO2

and 4CO2 → 2H2O

∴ the volume of H2O required is:

= 75 L /2
= 37.5 L

C) and from the balanced equation and by the same way:

when 5 liters O2 reacts to give 4 liters of CO2

and we have 75 L of CO2:

5 O2 → 4 CO2

?? ← 75 L

∴ the volume of O2 required is:

= 75 *(5/4)

= 93.75 L

D) about the using of the number of moles the answer is:

no, there is no need to find the number of moles as we called everything in the balanced equation by liters and use it as a liter unit to get the volume, without the need to get the number of moles.

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3 years ago

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