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prisoha [69]
3 years ago
11

3. Use the chart to answer the following question. Amanda found a stone

Chemistry
1 answer:
REY [17]3 years ago
6 0

Answer:

Quartz

Explanation:

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Which of the following is a clue that something is pseudoscience?
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D i think if not here’s this a collection of beliefs or practices mistakenly regarded as being based on scientific method
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Given the equation representing a system at equilibrium:
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I think the one that cause the equilibrium to shift would be :
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3 years ago
Give the direction of the reaction, if K >> 1. Give the direction of the reaction, if K >> 1. The forward reaction i
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Answer:

A. for K>>1 you can say that the reaction is nearly irreversible so the forward direction is favored. (Products formation)

B. When the temperature rises the equilibrium is going to change but to know how is going to change you have to take into account the kind of reaction. For endothermic reactions (the reverse reaction is favored) and for exothermic reactions (the forward reaction is favored)

Explanation:

A. The equilibrium constant K is defined as

K=\frac{Products}{reagents}

In any case  

aA +Bb  equilibrium Cd +dD

where K is:

K= \frac{[C]^{c}[D]^{d}}{[A]^{a}[B]^{b}}

[] is molar concentration.

If K>>> 1 it means that the molar concentration of products is a lot bigger that the molar concentration of reagents, so the forward reaction is favored.

B. The relation between K and temperature is given by the Van't Hoff equation

ln(\frac{K_{1}}{K_{2}})=\frac{-delta H^{o}}{R}*(\frac{1}{T_{1}}-\frac{1}{T_{2}})

Where: H is reaction enthalpy, R is the gas constant and T temperature.  

Clearing the equation for K_{2} we get:

K_{2}=\frac{K_{1}}{e^{\frac{-deltaH^{o}}{R}*(\frac{1}{T_{1}} -\frac{1}{T_{2}})}}

Here we can study two cases: when delta H^{o} is positive (exothermic reactions) and when is negative (endothermic reactions)

For exothermic reactions when we increase the temperature the denominator in the equation would have a negative exponent so K_{2} is greater that K_{1} and the forward reaction is favored.

When we have an endothermic reaction we will have a positive exponent so K_{2} will be less than K_{1} the forward reactions is not favored.  

{e^{\frac{-deltaH^{o}}{R}*(\frac{1}{T_{1}} -\frac{1}{T_{2}})}}

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3 years ago
Would you expect Nio to dissolve in an aqueous solution of NaNO3?
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Answer:

NiO Does Not Dissolve In An Aqueous Solution Of NaNO3.

Explanation:

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Help me make a hypothesis out of this question for my project.
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Animals are able to see much more clearly in the dark than humans can.

Or

Humans are able to see much more clearly in the dark than animals can.
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