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zvonat [6]
4 years ago
14

How have chemists changed the periodic table over time? Apex

Chemistry
2 answers:
frozen [14]4 years ago
8 0

Answer:

by adding new ones !

Explanation:

skad [1K]4 years ago
8 0

Answer:

they have added new elements to the table

Explanation:

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Given the equilibrium constants for the following two reactions at a 298K:NiO(s) + H2(g) ⇌ Ni(s) + H2O(g) Kc=40NiO(s) +CO(g) ⇌ N
shusha [124]

Answer:

The value  is  K_C =  \frac{40}{600}

Explanation:

From the question

   The equation given is  

            NiO(s) + H2(g) ⇌ Ni(s) + H2O(g) Kc=40          (1)

            NiO(s) +CO(g) ⇌ Ni(s) +CO2(g) Kc=600         (2)

Generally the reverse of the second equation as shown below

            Ni(s) +CO2(g) ⇌  NiO(s) + CO(g)                 (3)

The equilibrium constant becomes    K_c  ' =  \frac{1}{600}  

 Now  adding  1  and  3 we obtain

      NiO(s) + H2(g)+ Ni(s) +CO2(g) ⇌ Ni(s) + H2O(g)+NiO(s) + CO(g)        

               CO2(g) + H2(g) ⇌ CO(g) + H2O(g)

Hence the equilibrium constant for the resulting equation is mathematically evaluated as

           K_C =  K_c' *  K_c

=>       K_C =  \frac{1}{600}  *  40

=>         K_C =  \frac{40}{600}

       

6 0
3 years ago
Is the dissolution of ammonium chloride in water an exothermic or endothermic<br> process.
Travka [436]
Endothermic because the separation of the ions dictate the overall reaction
6 0
3 years ago
How many moles of water are created if 3 moles of hydrogen react completely with excess oxygen?
Alenkinab [10]

Answer:

3.0 moles.

Explanation:

  • It is a stichiometry problem.
  • The chemical reaction of reacting hydrogen with oxygen to produce water is:

<em>H₂ + 1/2 O₂ → H₂O.</em>

  • It is clear that <em><u>1.0 mole of H₂</u></em> reacts with 0.5 mole of O₂ to produce <u><em>1.0 mole of  water</em></u>.
  • The ratio of the reacting hydrogen to the produced water is 1:1.

∴ The number of moles of water created from reacting 3.0 moles of hydrogen completely with excess oxygen = 3.0 moles.

4 0
4 years ago
What kind of intermolecular forces act between a hydrogen cyanide molecule and a chloromethane molecule? note: if there is more
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London dispersion forces, dipole forces
3 0
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What is the molar mass of fluorine
MissTica
THE MOLAR MASS OF FLUORINE IS 35G/MOL
5 0
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