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m_a_m_a [10]
3 years ago
13

What are valence electrons and why are they so important in chemistry?

Chemistry
2 answers:
natka813 [3]3 years ago
7 0
Valence electrons is an electron that can participate in the formation of a chemical bond.Also, valence electrons have the ability to absord or release energy in the form of a photon. Valence electrons are in the energy level that is farthest aways from the nucleus. The valence electrons are the ones, that in a chemical reaction, are gained, lost or shared.

stealth61 [152]3 years ago
3 0

valance electrons that reside in the outermost shell of an atom in the highest energy level. They are important to atoms because the fewer valence electrons that the atom holds, it becomes less stable.

I take honors chemistry I hope this helps.

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If 15.0 g of nitrogen reacts with 15.0 g of hydrogen, 10.5 g of ammonia is
Alexxx [7]

Answer:

Percent yield =  57%

Explanation:

Given data:

Mass of nitrogen = 15.0 g

Mass of hydrogen = 15.0 g

Mass of ammonia produced = 10.5 g

Percent yield = ?

Solution:

Chemical equation:

N₂+ 3H₂      →   2NH₃

Number of moles of hydrogen:

Number of moles = mass/molar mass

Number of moles = 15.0 g/ 2 g/mol

Number of moles = 7.5 mol

Number of moles of nitrogen:

Number of moles = mass/molar mass

Number of moles = 15.0 g/ 28 g/mol

Number of moles = 0.54 mol

Now we will compare the moles of ammonia with nitrogen and hydrogen from balance chemical equation.

              N₂       :        NH₃

               1         :          2

           0.54       :     2×0.54 = 1.08

             H₂         :           NH₃

              3           :            2

              7.5        :      2/3×7.5= 5 mol

Theoretical yield of ammonia:

Mass = number of moles × molar mass

Mass = 1.08 × 17 g/mol

Mass = 18.36 g

Percent yield:

Percent yield = (actual yield / theoretical yield) ×100

Percent yield = (10.5 g/ 18.36 g) ×100

Percent yield = 0.57 ×100

Percent yield =  57%

8 0
3 years ago
An ionic compound is formed when
Darina [25.2K]
Metal bonds with nonmetal
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3 years ago
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What is the mass number of atom with 7neutron and 7 proton number
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3 years ago
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A metal object with mass of 22.7 g is heated to 97.0 ∘C and then transferred to an insulated container containing 84.7 g of wate
Lunna [17]

The specific heat of the metal object with a mass of 22.7g heated to to temperature of 97.0°C and then transferred to an insulated container containing 84.7 g of water at 20.5 ∘C is 0.815J/g°C

How to calculate specific heat?

The specific heat capacity of a metal can be calculated using the calorimetry equation as follows:

Q = mc∆T

Where;

Q = quantity of heat absorbed

m = mass of substance

c = specific heat capacity

∆T = change in temperature

mc∆T (water) = -mc∆T (metal)

84.7 × 4.18 × 3.8 = - (22.7 × c × -72.7)

1345.375 = 1650.29c

c = 0.815J/g°C

Therefore, the specific heat of the metal object with a mass of 22.7g heated to to temperature of 97.0°C and then transferred to an insulated container containing 84.7 g of water at 20.5 ∘C is 0.815J/g°C.

Learn more about specific heat capacity at:

#SPJ1

3 0
2 years ago
Please help and explain I'm stuck!!
SCORPION-xisa [38]
Will be produced 125 grams of H2O, I this may help you.
Greetings from Brazil

5 0
3 years ago
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