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Lilit [14]
4 years ago
8

Urgent!!!!!! Describe how to use Le Chatelier's principle to predict the possible ways a chemical system can respond to changes.

Chemistry
1 answer:
Gelneren [198K]4 years ago
4 0
According to <span>Le Chatelier's Principle," when a system at equilibrium is subjected to any external stress by changing concentration, pressure or temperature, it will modify itself in such a way so as to minimize the effect of that change made in it".

Change in Concentration:
Suppose following reaction at equilibrium,

                                             A  +  B    </span>⇆    C

When the concentration of reactants (A or B) is increased the equilibrium will shift in forward direction and will produce more product in order to cancel out the effect of extra reactant added. Or, if product (C) is added then it will respond in opposite direction.

Change in Pressure:
Suppose following reaction at equilibrium,

                                             A  +  B    ⇆    C

If pressure is applied on this equilibrium, the equilibrium will shift in forward direction because there  is a decrease in volume at product side (1 mole as compare to reactants which are 2 moles). And the opposite case will be observed if the pressure is decreases.

Change in Temperature:
Suppose following reaction at equilibrium,

                                             A  +  B    ⇆    C  + Heat

This is an exothermic reaction (heat is evolved) and the heat produced is in the product side. When the temperature is increased the equilibrium will shift in the backward direction. And decrease in temperature will shift the equilibrium in forward direction.
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Answer:

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Explanation:

4 0
3 years ago
The surface temperature on Venus may approach 757 K. What is this temperature in degrees Celsius?
kotykmax [81]

Explanation:

1 ) Temperature of Venus in Kelvins =  757 Kelvins

0^oC=273 Kelvins

Temperature of Venus in degrees Celsius =757-273 K=484 K

2 ) Temperature on Mercury at night = -269^oF

(T)^oC=((T)^oF-32)\times \frac{5}{9}

(T)^oC=((-269)^oF-32)\times \frac{5}{9}=167.22^oC

Temperature on Mercury at night in degree Celsius = 167.22° C

7 0
3 years ago
Read 2 more answers
For the first order process: AB The half-life of A is 62.1 seconds. If a sample of A initially has 250.0 g, what mass (in g) of
vodomira [7]

<u>Answer:</u> The mass of sample A after given time is 99.05 g.

<u>Explanation:</u>

All the radioactive reactions follows first order kinetics.

The equation used to calculate half life for first order kinetics:

t_{1/2}=\frac{0.693}{k}

We are given:

t_{1/2}=62.1s

Putting values in above equation, we get:

k=\frac{0.693}{62.1}=0.011s^{-1}

Rate law expression for first order kinetics is given by the equation:

k=\frac{2.303}{t}\log\frac{[A_o]}{[A]}

where,

k = rate constant = 0.011s^{-1}

t = time taken for decay process = 84.2 s

[A_o] = initial amount of the reactant = 250 g

[A] = amount left after decay process =  ?

Putting values in above equation, we get:

0.011s^{-1}=\frac{2.303}{84.2s}\log\frac{250}{[A]}

[A]=99.05g

Hence, the mass of sample A after given time is 99.05 g.

8 0
3 years ago
Determine the volume of distilled water that should be added to 20.0 mL of 12.0 M HCl(aq) in order to prepare a 0.500 M HCl(aq)
BARSIC [14]

Answer:

V_{H_2O}=460 mL

Explanation:

Hello!

In this case, in a dilution process, water is added to a solute in order to decrease its concentration but increase the volume of the solution. It means that if we have 20.0 mL of a 12.0-M solution of HCl and we want a 0.500-M solution, we need to apply the following formula considering that the moles remain unchanged:

M_1V_1=M_2V_2

Thus, solving for the final volume is:

V_2=\frac{M_1V_1}{M_2}

So plugging in the values we obtain:

V_2=\frac{12.0M*20.0mL}{0.500M}\\\\V_2=480 mL

Now, since the initial volume of acid was 20.0 mL and the final volume is 480 mL, the added volume of distilled water is:

V_{H_2O}=480-20=460 mL

Best regards!

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3 years ago
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