Describe the characteristics of the state of equilibrium by taking a physical process and a chemical process as examples.

Describe the characteristics of the state of equilibrium by taking a physical process and a chemical process as examples.
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Question 1

Describe the characteristics of the state of equilibrium by taking a physical process and a chemical process as examples.

Question 2

Examine the household products sold at the local supermarket, and identify four items that contain either acids or bases. List the product name and the acid or base that it contains.

Question 3

The pH values of four solutions are given. Identify them as acids and bases, and complete the table given below. Arrange the chemicals in increasing order of acidity or basicity.

Question 4

In the years immediately after the discovery of atomic energy, it was widely believed that the cost of atomic power generation would be so cheap that electricity would be nearly free. What are the problems associated with atomic power plants? How many of these problems are technical or chemical? How many of these problems are attitudinal or psychological?

Question 5

Solve the following problems on standard enthalpies of reactions: 1. Calculate the standard enthalpy change for the reaction OF2 (g) + H2O (l) → O2 (g) + 2HF (g). Standard enthalpies of OF2, H2O, and HF are 20 kJ mol-1, -285 kJ mol-1, and -270 kJ mol-1 respectively. 2. Calculate the standard enthalpy of H2O2. The standard enthalpy change for the reaction 2H2O2 (l) → 2H2O (l) + O2 (g) is -196 kJ, and the standard enthalpy of H2O is -285 kJ mol-1.

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