Using the equation PH = -log (H+), a solution with a (H+)= 10+ M has a PH of which of the following?

A. 9

B. 5

C. 1

D. 10

Answer Explanation:

Concentration of H+ in the solution = 10 −1 M

pH= -log(10 −1)

pH= -(-1)

Therefore, the Correct Answer is C.

Q #1: Experiments cannot validate hypotheses, only falsify them The statement above can be restated in which of the following ways?

A. Until disproved, an exploration for an observation is valid

B. A hypothesis that has not been falsified remains provisional

C. Certain concepts cannot be subjected to direct experimentation

D. Proving a hypothesis exempt from further testing

Answer Explanation

This means that a hypothesis is considered valid until it is disproved by experimental evidence. However, even if a hypothesis has not been falsified, it is still considered provisional and subject to further testing and scrutiny.
Q #2: Which of the following hormones regulates blood calcium levels?

A. Parathyroid hormone

B. Growth hormone

C. Norepinephrine

D. Melatonin

Answer Explanation

The parathyroid hormone (PTH) from the parathyroid glands is important in serum calcium regulation. It increases blood calcium levels by stimulating osteoclasts to break down bone and release calcium into the bloodstream. PTH also enhances the absorption of calcium from the intestines and the kidneys.
Q #3: 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.

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Using the equation PH = -log (H+), a solution with a (H+)= 10+ M has a PH of which of the following?

More Questions on TEAS 7 Science

Q #1: Experiments cannot validate hypotheses, only falsify them The statement above can be restated in which of the following ways?

Answer Explanation

Q #2: Which of the following hormones regulates blood calcium levels?

Answer Explanation

Q #3: Which of the following is correct regarding the pH scale?

Answer Explanation

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