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dimulka [17.4K]
3 years ago
11

An aqueous solution of blue copper(II) ions can react with chloride ions to form a yellow copper compound. The ionic equation fo

r this reaction is: Cu² + 4CI- ⇌ [CuCl]²-
The forward reaction is endothermic. What two things can you say about the enthalpy change for the reverse reaction?
Chemistry
1 answer:
klio [65]3 years ago
5 0
Since the forward reaction is endothermic (heat is consumed in the reaction) that means that the enthalpy change for the forward reaction is a positive value.
Therefore, i would say that the reverse or backward reaction is exothermic (heat is released in the reaction to the sorroundings) and that the enthalpy change is a negative value.
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The first and Third graph
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37.9 grams of an unknown substance undergoes a temperature increase of
jenyasd209 [6]

Answer:

1.023 J / g °C

Explanation:

m = 37.9 grams

ΔT = 25.0*C

H = 969 J

c = ?

The equation relating these equation is;

H = mcΔT

making c subject of formulae;

c = H / mΔT

c = 969 J / (37.9 g * 25.0*C)

Upon solving;

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Explanation:

Some Rules Regarding Oxidation Numbers:

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- Oxygen has oxidation number of -2 except in peroxides where it is -1

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- Oxidation number of a compound is the sum total of the individual elements and a neutral  compound has oxidation number of 0.

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1 + x = 0

x = -1

B. PBr3

Br has oxidation number of - 1

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x + 3 (-1) = 0

x = + 3

C. KH

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8 0
3 years ago
The maximum amount of nickel(II) cyanide that will dissolve in a 0.220 M nickel(II) nitrate solution is...?
sweet [91]

Answer : The maximum amount of nickel(II) cyanide is 5.84\times 10^{-12}M

Explanation :

The solubility equilibrium reaction will be:

                       Ni(CN)_2\rightleftharpoons Ni^{2+}+2CN^-

Initial conc.                        0.220       0

At eqm.                             (0.220+s)   2s

The expression for solubility constant for this reaction will be,

K_{sp}=[Ni^{2+}][CN^-]^2

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

3.0\times 10^{-23}=(0.220+s)\times (2s)^2

s=5.84\times 10^{-12}M

Therefore, the maximum amount of nickel(II) cyanide is 5.84\times 10^{-12}M

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3 years ago
Carbon forms a great variety of stable compounds. Which of the following is not a reason for this variety?
katen-ka-za [31]

Answer:

D.

Explanation:

Carbon atoms are not strongly electronegative  and  tend to form  covalent bonds.

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3 years ago
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