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algol13
4 years ago
15

Which sentence describes energy?

Chemistry
1 answer:
alukav5142 [94]4 years ago
3 0
I’m pretty sure it’s D because energy measures the kinetic, thermal, electrical, chemical, nuclear and other forms.
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Complete the bolded items in each box below
pentagon [3]

Show the bolded items and the boxes.

4 0
3 years ago
Review the reversible reactions given, along with the associated equilibrium constant Kat room temperature. In each case, determ
IgorC [24]

Answer:

The answers to your questions are given below

Explanation:

The following data were obtained from the question:

CH3COOH → CH3C00^- + H^+

Equilibrium constant, Ka = 1.8 x 10^-5

AgCl → Ag^+ + Cl^-

Equilibrium constant, Ksp = 1.6 x 10^-10

Al(OH)3 → Al^3+ + 3OH^-

Equilibrium constant, Ksp = 3.7 x 10^-15

A+B → C

Equilibrium constant, K = 4.9 x 10^3

When the value of the equilibrium constant is grater than 1, it shows that the concentration of product is higher than that of the reactant and it implies that the forward reaction is favored.

When the value of the equilibrium constant is 1, it shows that the the concentration of the product and reactant are the same. Therefore neither the forward nor the reverse reaction is favored.

When the value of the equilibrium constant is lesser than 1, it shows that the concentration of the reactant is higher than the concentration of the product. Therefore, the reversed reaction is favored.

Now, we shall the question given above as follow:

A. CH3COOH → CH3C00^- + H^+

Equilibrium constant, Ka = 1.8 x 10^-5

Since the value of the equilibrium constant is lesser than 1, it means that the reverse reaction is favored.

B. AgCl → Ag^+ + Cl^-

Equilibrium constant, Ksp = 1.6 x 10^-10

Since the value of the equilibrium constant is lesser than 1, it means that the reverse reaction is favored.

C. Al(OH)3 → Al^3+ + 3OH^-

Equilibrium constant, Ksp = 3.7 x 10^-15

Since the value of the equilibrium constant is lesser than 1, it means that the reverse reaction is favored.

D. A+B → C

Equilibrium constant, K = 4.9 x 10^3

Since the value of the equilibrium constant is greater than 1, it means that the forward reaction is favored.

5 0
3 years ago
If a reaction is exothermic and its entropy change is positive, which statement is true? If a reaction is exothermic and its ent
Serggg [28]

Answer:

  • <em>c. The reaction is spontaneous at all temperatures.</em>

Explanation:

The spontaneity of a reaction can be determined by the thermodynamic property named Gibb's free energy or simply free energy (G).

The change in the free energy of a system is defined as the difference between the increase in enthalpy (ΔH) and the product of the temperature (T) times the increase in entropy (ΔS):

  • ΔG = ΔH - T ΔS

The sign of ΔG tells if a reaction is spontaneous according to this:

  • ΔG < 0, the reaction is spontaneous.
  • ΔG = 0, the reaction is in equilibrium.
  • ΔG > 0, the reaction is not spontaneous.

The question states that a reaction is exothermic, and its entropy change is positive. That means:

  • Exhotermic: ΔH < 0
  • Positive entropy change: ΔS > 0

Remember that the temperature is stated in absolute scale, so T is always positive.

Hence, ΔG = ΔH - T ΔS = (negative) - T (positive) = (negative) + (negative) = negative.

<u>Conclusion</u>: since ΔG is negative, regardless the temperature, you conclude that<em><u> the reaction is spontaneous at all temperatures, which is the option c.</u></em>

4 0
3 years ago
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A cube has a mass of 83.021 g and a side length of 7.55cm.
AleksandrR [38]

not understand

Explanation:

hshabaha

7 0
3 years ago
If an oxygen isotope has 8 protons and 10 neutrons in its nucleus, what is its atomic mass
murzikaleks [220]
It is 18 amu............
6 0
4 years ago
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