Estimate the percentage growth rate for a population of bacteria that grew from 100 to 6400 in 1 day.

r = 4.15

Explanation:

Given:

Number of initial bacteria = 100

Number of Final bacteria = 6400

Find:

Growth rate

Computation:

6400 = 100 ×

6400 / 100 =

64 =

Taking natural log both side

r = 4.15

The correct answer is D. A pure substance

Explanation:

In chemistry and related fields, a pure substance refers to a homogeneous substance in any state (solid, gas, liquid) that has defined and consistent chemical properties. This category includes chemical elements that have not reacted with other elements and compounds (mix of two or more elements) that are homogeneous.

In the case of oxygen that is represented by the symbol O this is a pure chemical element, this implies this substance has not been mixed with others, in it, all atoms are similar or identical, and it has defined chemical properties. Therefore, oxygen can be classified as a pure substance because it is homogeneous in composition and chemical properties (Option D).