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2 answers:
Answer: Option (a) is the correct answer.
Explanation:
Rate of a reaction gets affected by change in temperature as when we decrease the temperature then reactant molecules lose kinetic energy. As a result, there occurs decrease in number of collisions between the molecules.
Hence, rate of reaction also decreases with decrease in temperature.
Whereas when we increase the concentration from 30 mg to 60 mg then there is increase in number of reactant molecules. Therefore, there will be increase in number of collisions between the molecules.
Also, when substance is placed in smaller container then molecules come closer to each other and thus collide more frequently. So, rate of reaction will also increase.
On the other hand, grinding the substance into a powder will also increase the number of reactant particles. Thus, this will also increase the rate of reaction.
Thus, we can conclude that changing the temperature from to
will decrease the rate of a reaction.
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Answer:
The electrochemical equivalent of copper, Cu, is 3.29015544 × 10⁻⁷ g/C
Explanation:
The given parameters are;
The element for which the electrochemical equivalent is sought = Copper
The atomic mass of copper = 63.5
The electrochemical equivalent, 'Z', of an element or a substance is the mass, 'm', of the element or substance deposited by one coulomb of electricity, which is equivalent to a 1 ampere current flowing for a period of 1 second
Mathematically, we have;
m = Z·I·t = Z·Q
We have;
Cu²⁺ (aq) + 2·e⁻ → Cu
Therefore, one mole of Cu, is deposited by 2 moles of electrons
The charge carried one mole of electrons = 1 Faraday = 96500 C
∴ The charge carried two moles of electrons, Q = 2 × 96500 C = 193,000 C
Given that the mass of an atom of Cu = 63.5 a.m.u., the mass of one mole of Cu, m = 63.5 g
∴ Z = 3.29015544 × 10⁻⁴ g/C = 3.29015544 × 10⁻⁷ g/C
The electrochemical equivalent of copper, Cu, is Z = 3.29015544 × 10⁻⁷ g/C