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4 years ago

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

1 answer:

4 0

According to 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 ⇆ 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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How does chemistry affect sports?

katrin [286]

Answer:

Explanation:

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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]

Answer: The mass of sample A after given time is 99.05 g.

Explanation:

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:

$M_1V_1=M_2V_2$