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2 years ago

Define valence electrons.

Chemistry

1 answer:

vodka [1.7K]2 years ago

8 0

Answer:

Electrons on the outermost shell of an atom. They are responsible for the chemical properties of an atom.

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Plz help quick

vovangra [49]

Answer:

Explanation:

If oxygen reacts with iron, then both must be reactants and rust the product of that reaction

4 0

2 years ago

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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.

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2 years ago

The boiling point of h2o (100 oc) is higher than the boiling point of h2s (-61 oc) because

aksik [14]

Water has hydrogen bonds between Hydrogen atoms (that are slightly positive in molecules of water ) and Oxygen atoms (that are slightly negative in molecules of water), so it is necessary more energy to break them down and move water molecules from liquid state to gas.

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2 years ago

1 mole = 1000 millimoles (mmol); 1millimole = 1000 micromoles (µmol). if a solution contains 38231 µmol, what is that amount in

Mrrafil [7]

1 mmol --------------------- 1000 µmol
( mmol ) -------------------- 38231 µmol

mmol = 38231*1 / 1000

mmol = 38231/ 1000

=> 38.231 mmol

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2 years ago

Add 3 x 10^9 +5.3 x 10^10

Ghella [55]

Add 3 x 10^9 +5.3 x 10^10

 3 x 10^9
+5.3 x 10^10
------------------
5.6 x 10^10

8 0

2 years ago

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