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4 years ago

Why do we ignore noble gases usually when we discuss electronegativity values?

Chemistry

1 answer:

RSB [31]4 years ago

3 0

Because they don’t have charges

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Which combination of protons neutrons and electrons is correct for the isotope of copper- 63?

Eva8 [605]

29 protons, 34 neutrons, and if there is no charge there will be 29 electrons

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4 years ago

odium carbonate (Na2CO3Na2CO3) is used to neutralize the sulfuric acid spill. How many kilograms of sodium carbonate must be add

Arte-miy333 [17]

Answer : The mass of sodium carbonate added to neutralize must be, $6.54\times 10^3kg$

Explanation :

First we have to calculate the moles of $H_2SO_4$ .

$\text{Moles of }H_2SO_4=\frac{\text{Mass of }H_2SO_4}{\text{Molar mass of }H_2SO_4}$

Given:

Molar mass of $H_2SO_4$ = 98 g/mole

Mass of $H_2SO_4$ = $6.05\times 10^3kg=6.05\times 10^6g$

Conversion used : (1 kg = 1000 g)

Now put all the given values in the above expression, we get:

$\text{Moles of }H_2SO_4=\frac{6.05\times 10^6g}{98g/mol}=6.17\times 10^4mol$

The moles of $H_2SO_4$ is, $6.17\times 10^4mol$

Now we have to calculate the moles of $Na_2CO_3$

The balanced neutralization reaction is:

$Na_2CO_3+H_2SO_4\rightarrow Na_2SO_4+H_2CO_3$

From the balanced chemical reaction we conclude that,

As, 1 mole of $H_2SO_4$ neutralizes 1 mole of $Na_2CO_3$

So, $6.17\times 10^4mol$ of $H_2SO_4$ neutralizes

Now we have to calculate the mass of $Na_2CO_3$

$\text{ Mass of }Na_2CO_3=\text{ Moles of }Na_2CO_3\times \text{ Molar mass of }Na_2CO_3$

Molar mass of $Na_2CO_3$ = 106 g/mole

$\text{ Mass of }Na_2CO_3=(6.17\times 10^4mol)\times (106g/mole)=6.54\times 10^6g=6.54\times 10^3kg$

Thus, the mass of sodium carbonate added to neutralize must be, $6.54\times 10^3kg$

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4 years ago

Why do lungfish walk on land?

kicyunya [14]

Lungfish are thought to be related to the first creatures that crawled out of the water to colonize land. The new findings support the theory that walking first arose underwater, preceding the move onto land and the development of toes and limbs adapted to land perambulation. ..

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3 years ago

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Hydrogen has a red emission line at 656.3 nm, what is the energy and frequency of a photon of this light? Note: planck's constan

Yuliya22 [10]

We know that

Speed of light = wavelength X frequency

Energy of light = h X frequency

Where

h = planck's constant = 6.626 x 10–34 j·s

frequency = speed of light / wavelength = 2.998 x 10^8 m/s / 656.3 X 10^-9

frequency = 4.57 X 10^14 / s

Energy = 6.626 x 10–34 j·s X 4.57 X 10^14 / s = 3.028 X 10^-19 Joules

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3 years ago

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An ion with 5 protons, 6 neutrons, and a charge of 3+ has an atomic number of

user100 [1]

Answer:1. 5

Explanation: the element is boron and the atomic number is 5

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3 years ago