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Which of the following is correct regarding the pH scale?

A. A substance with a pH of 3 is two times more alkaline than a substance with a pH of 4

B. A substance with a pH of 3 is 10 times more acidic than a substance with a pH of 4

C. A substance with a pH of 3 is two times more acidic than a substance with a pH of 4

D. A substance with pH of 3 is 10 times more alkaline than a substance with a pH of 4

Answer Explanation:

The pH scale is logarithmic, indicating that each whole number change on the pH scale represents a tenfold change in acidity or alkalinity. Therefore, a substance with a pH of 3 is 10 times more acidic than a substance with a pH of 4.

Therefore, the Correct Answer is B.

Q #1: An experienced mountaineer decides to climb Mount Everest, taking the same route in the same season and with similar materials and equipment used in a fatal 1924 expedition Which of the following is the scientific purpose of such a climb?

A. To measure the oxygen levels at high elevation

B. To assess why the earlier expedition failed

C. To show that modem technology makes climbing safer

D. To identify routes that can be explored in future climbs

Answer Explanation

The experienced mountain climber is replicating the conditions of the past expedition to understand why that earlier attempt was unsuccessful.
Q #2: Which of the following organs removes nitrogenous waste from the body?

A. Large Intestines

B. Liver

C. Kidneys

D. Gall Bladder

Answer Explanation

The kidneys are the primary organs involved in the excretion of nitrogenous wastes. Nitrogenous wastes are mostly products of protein metabolism in the liver. One of the common nitrogenous waste products is urea, which is excreted through the kidneys.
Q #3: Escherichia cell is plated on nutrient agar plates that each contain a different type of antibiotic. The shaded area represents growth of the bacteria. Which of the following plates contains bacteria that were most resistant to the antibiotic

A. A

B. B

C. C

D. D

Answer Explanation

This is the plate with the most growth despite the presence of antibiotic cover.

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