A mechanical wave can be defined by

d. All of the above

Explanation:

Here is the complete question

A mechanical wave can be defined by which of the following?

a. Carries energy from one place to another

b. Moves through solids, liquids, and gasses

c. Is created when a source of energy creates a vibration

d. All of the above

Solution

A mechanical wave is an oscillation of matter which carries energy from one place to another. This oscillation of matter shows that a mechanical wave requires a medium to pass through, be it solid, liquid or gas.

A mechanical wave can usually be created by the the vibration of a medium due to a source of energy.

Examples of mechanical waves are sound waves and water waves

Since all these characterize a mechanical wave, the option d is the correct answer

Slope = M / s

k = +0.016 / s

Explanation:

Given:

- A first order reaction   (missing from question)

- Slope is -0.016

Find:

Units of Slope and value of k

Solution:

- The slope of the concentration time graph is called the rate of reaction. For which the rate of reactions is always expressed as change in concentration of reactants per unit time. Hence,

                  Slope = Change in concentration / time

                  Slope = M / s

- The units of k constant depends on the order of reaction. The graph given is of first order. Hence, the sum of moles of reactants and products is the same. Hence, the units of constant k is given by:

                  k = +0.016 / s