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3 years ago

Why do some elements (ex: Neon) have a large number of spectral lines, compared to Hydrogen?

1 answer:

7 0

The production of absorption and emission lines . The first theory of the atom to provide an explanation of hydrogen's observed spectral lines those two energy levels, the electron can exist only in certain sharply defined . The number of protons in the nucleus of an atom determines the element that

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38.9% de Bario, 29.4% de Cr y 31.7% de o

Kay [80]

Answer:

jjiooyfffffffffffcvģg5fffvgvvvhh

Explanation:

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2 years ago

When copper metal is added to nitric acid, the following reaction takes place

zlopas [31]

Answer:

The volume of NO₂ gas collected over water at 25.0 °C is 1.68 Liters.

Explanation:

$Cu (s) + 4 HNO_3 (aq) \rightarrow Cu(NO_3)_2 (aq) + 2 H_2O (l) + 2 NO_2 (g)$

Moles of copper = $\frac{2.01 g}{63.55 g/mol}=0.03163 mol$

According to reaction, 1 mol of copper gives 2 moles of nitrogen dioxide gas.

Then 0.03613 moles of copper will give:

$\frac{2}{1}\times 0.03163 mol=0.06326 mol$ of nitrogen dioxide gas

Moles of nitrogen dioxide gas = n = 0.06326 mol

Pressure of the gas = P

P = Total pressure - vapor pressure of water

P = 726 mmHg - 23.8 mmHg = 702.2 mmHg

P = 0.924 atm (1 atm = 760 mmHg)

Temperature of the gas = T = 25.0°C =298.15 K

Volume of the gas = V

$PV=nRT$

$V=\frac{0.06326 mol\times 0.0821 atm L/mol K\times 298.15 K}{0.924 atm}$

V = 1.68 L

The volume of NO₂ gas collected over water at 25.0 °C is 1.68 Liters.

3 0

3 years ago

Gold alloys are _____.

chubhunter [2.5K]

Gold alloys consist of most commonly Nickel!
Most commonly used in things like jewelry so it doesn't have such a heavy weight.

7 0

3 years ago

Why are molecule atoms as far away from each other as possible

iVinArrow [24]

According to VSEPR theory, molecular geometry can be predicted by starting with the electron pair geometry about the central atom and adding atoms to some or all of the electron pairs.

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3 years ago

I am a fourth period transition metal. And when you look at

Allushta [10]

Answer:

Explanation:

cjshdgcuidenuyeiydn7eydn8y8c

7 0

3 years ago