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ATI TEAS 7

Chemistry

1. What is the characteristic property of acids?

Correct answer: b

Rationale: Acids typically have a sour taste. The other choices do not accurately describe the characteristic properties of acids.

2. What happens to the frequency of a wave if its wavelength decreases while the speed remains constant?

Correct answer: b

Rationale: If the speed of the wave remains constant while the wavelength decreases, the frequency of the wave increases.

3. What is the pH of a solution with a hydrogen ion concentration of \(1 \times 10^{-9}\) M?

Correct answer: c

Rationale: The pH is calculated as the negative logarithm (base 10) of the hydrogen ion concentration. In this case, \(-\log(1 \times 10^{-9}) = 9\).

4. In plant cells, what structure provides rigidity and support?

Correct answer: D

Rationale: The correct answer is D: Cell wall. The cell wall is a rigid structure found in plant cells that provides support and protection. It is composed of cellulose and other materials, forming a tough outer layer that helps maintain the cell's shape and prevents it from bursting under pressure. The cell membrane (option A) is a semi-permeable barrier that surrounds the cell but does not provide rigidity. The Golgi apparatus (option B) is involved in sorting and packaging proteins. Plastids (option C) are organelles responsible for functions like photosynthesis and storage, but they do not provide rigidity and support like the cell wall does.

5. Which sentence uses the semicolon correctly?

Correct answer: B

Rationale: Option B joins two independent clauses related to the same event.

6. When water boils, it changes from a liquid to a gas. This is an example of a:

Correct answer: B

Rationale: Physical change - Boiling water involves a change in state, not the chemical composition of the molecules. Chemical reactions involve breaking and forming new bonds, which is not the case here.

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