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3 years ago

List the FOUR examples of physical changes shown in the video. Why are these physical changes?

Chemistry

1 answer:

s344n2d4d5 [400]3 years ago

6 0

Explanation:

A physical change is a change that alters the physical properties of matter most especially the state and the form. This change has the following attributes.

it is easily reversible
leads to the production of no new kinds of matter
involves no change in mass
requires little energy

Therefore, some of the examples of physical changes are:

boiling
melting
freezing
condensation
sublimation
magnetization of metals
breaking of glass
cutting of wood

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3 years ago

The following reaction was carried out in a 3.25 L reaction vessel at 1100 K:

kipiarov [429]

Answer : The value of reaction quotient Q is, 0.498

Explanation:

Reaction quotient (Q) : It is defined as the measurement of the relative amounts of products and reactants present during a reaction at a particular time.

The given balanced chemical reaction is,

$C(s)+H_2O(g)\rightarrow CO(g)+H_2(g)$

The expression for reaction quotient will be :

$Q=\frac{[CO][H_2]}{[H_2O]}$

In this expression, only gaseous or aqueous states are includes and pure liquid or solid states are omitted.

Now we have to calculate the concentration of $H_2O,CO\text{ and }H_2$

$\text{Concentration of }H_2O=\frac{\text{Moles of }H_2O}{\text{Volume of solution}}=\frac{13.3mol}{3.25L}=4.09M$

and,

$\text{Concentration of }CO=\frac{\text{Moles of }CO}{\text{Volume of solution}}=\frac{3.40mol}{3.25L}=1.05M$

and,

$\text{Concentration of }H_2=\frac{\text{Moles of }H_2}{\text{Volume of solution}}=\frac{6.30mol}{3.25L}=1.94M$

Now put all the given values in the above expression, we get:

$Q=\frac{(1.05)\times (1.94)}{(4.09)}=0.498$

Thus, the value of reaction quotient Q is, 0.498

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