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astraxan [27]
4 years ago
10

Predict at least two circumstances (outside influences) that would cause a system in equilibrium to change the concentrations of

its reactants or products.,
Chemistry
1 answer:
tresset_1 [31]4 years ago
4 0
<span>Any change in heat or pressure on a system in equilibrium will cause a shift of the equilibrium, changing the concentrations of the reactants and products. Increasing the heat for some reactions allows it to reach the threshold it needs to catalyze the reaction, for example.</span>
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Calculate the change in energy of an atom that emits a photon of wavelength 2.21 meters. (Planck's constant is 6.626 x 10-34 jou
UNO [17]

9.01 × 10⁻²⁶ J

<h3>Explanation</h3>

ΔE = h · f

Where

  • ΔE the change in energy,
  • h the planck's constant, and
  • f frequency of the emission.

However, only λ is given.

f = c / λ

Where

  • f frequency of the emission,
  • λ wavelength of the emission, and
  • c the speed of light.

For this emission:

f = 2.998 × 10⁸ / 2.21 = 1.36 × 10⁸ s⁻¹.

ΔE = h · f = 6.626 × 10⁻³⁴ × 1.36 × 10⁸ = 9.01 × 10⁻²⁶ J

5 0
3 years ago
Rank the metals from most reactive (1) to least reactive (3) silver, strontium, and technetium
Natasha2012 [34]

Answer:

1 = strontium

2 = technetium

3 = silver

Explanation:

Strontium is present in 2 group of periodic table. It is alkaline earth metal. It is most reactive element and can not found free in nature. it  is insoluble in water but react with water and form strontium hydroxide and hydrogen gas is also produced. It is radioactive element.

It is similar to the calcium and can incorporated into bones. The food rich with strontium is used to avoid the osteoporosis. It is found in leafy vegetables, grains, sea foods etc.

In given series strontium is highest in reactivity then technetium, while the technetium is more reactive than silver. The silver is less reactive as compared to both given elements.

7 0
3 years ago
Read 2 more answers
If the a of a monoprotic weak acid is 1. 2×10^−6. What is the [H] of a 0. 31 m solution of this acid?
Vanyuwa [196]

The pH of the solution of the given acid is 3.099

Let  HX  be the weak acid:

HX ⇌  H^{+}+ X^{-}

For which:

K_{a} = [ H^{+}][ X^{-}] / [HX]

If  K_{a} lies in the range 10^{-4} - 10^{-10}we can assume that the equilibrium concentrations used in the expression are a good enough approximation to the initial concentrations.

Rearranging and taking negative logs of both sides gives:

pH = \frac{1}{2} [pK_{a} - loga]

a is the concentration of the acid.

pK_{a} =-logK_{a} = -log (2×10^{-6}) = 5.69

pH = \frac{1}{2} [5.69- (-0.508)]

pH = 3.099

Learn more about pH of acid here;

brainly.com/question/13043236

#SPJ4

3 0
2 years ago
Preserved remains have turned to what?
Softa [21]

It depends on what the remains are. If you are looking for a word, it could either be fossils or if it is something that has preserved the soft tissue it can be described as mummified.
3 0
3 years ago
What is the octet rule? What is it based on?
Nimfa-mama [501]

Answer: The octet rule is a chemical rule of thumb that reflects the observation that main group elements tend to bond in such a way that each atom has eight electrons in its valence shell, giving it the same electronic configuration as a noble gas.

Explanation:

8 0
3 years ago
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