The heating and cooling of molecules will make what change their state of matter
2 answers:
Explanation:
Kinetic energy is defined as the energy obtained by an object. Also, kinetic energy is directly proportional to temperature according to the following relation.
K.E =
So, when we increase the temperature by heating a substance then its molecules tend to gain more kinetic energy due to which more number of collisions occur. As a result, state of matter changes from solid to liquid and from liquid to gas.
Whereas if there occurs a decrease in temperature then it means kinetic energy of molecules will decrease. Hence, molecules will come closer to each other.
Therefore, state of matter will change from gas to liquid and from liquid to solid.
Thus, we can conclude that the heating and cooling of molecules will make kinetic energy change their state of matter.
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Answer:
The answer to the question is
The mass percentage of NaCl(s) in the mixture is 49.7%
Explanation:
The given variables are
mass of sample of mixture = 0.3146 g
Volume of AgNO₃ required to react comletely with the chloride ions = 45.70 mL
Concentration of the AgNO₃ added = 0.08765 M
The equations for the reactions oare
NaCl(aq) + AgNO₃ (aq) = AgCl(s) + NaNO₃(aq)
AgNO₃ (aq) + KBr (aq) → AgBr (s) + KNO₃
The equation for the reaction shows one mole of NaCl reacts with one mole of AgNO₃ to form one mole of AgCl
Thus 45.70 mL of 0.08765 M solution of AgNO₃ contains
Therefore the sum of the number of moles of Br⁻ and Cl⁻
precipitated out of the solution = 0.004 moles
Thus if the mass of NaCl in the sample = z then the mass of KBr = y
However the mass of the sample is given as 0.3146 g which means the molarity of the solution is 0.004 moles
given by
and z + y = 0.3146
Therefore z = 0.3146 - y which gives
-8.7×10⁻³y +0.54×10⁻³ = 0.004
or 8.7×10⁻³y = 1.37769× 10⁻³
y = 0.158 g and z = 0.156 Thus the mass of NaCl = 0.156 g and the mass percentage = 0.156/0.3146×100 = 49.7% NaCl
The mass percentage of NaCl(s) in the mixture is 49.7%