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Which of the following is a characteristic property of bases?

A. Sour taste

B. Reaction with metals to release water

C. Turn phenolphthalein pink

D. Donate protons

Answer Explanation:

One of the characteristic properties of bases is their ability to react with certain metals to release hydrogen gas. This reaction is not as common or vigorous as the reaction of acids with metals but is still a defining property of bases. An example of this reaction is the reaction between sodium hydroxide (\(NaOH\)) and aluminum (\(Al\)), which produces hydrogen gas (\(H_2\)).

Therefore, the Correct Answer is C.

More Questions on TEAS 7 Science

  • Q #1: What is the effect of bases on the pH of a solution?

    A. Bases increase the pH

    B. Bases decrease the pH

    C. Bases have no effect on the pH

    D. It depends on the concentration of the base

    Answer Explanation

    Bases increase the pH of a solution. As bases ionize in water, they release hydroxide ions (\(OH^-\)), which react with \(H^+\) ions from water, thereby decreasing the concentration of \(H^+\) ions and increasing the pH.

  • Q #2: How do bases affect the electrical conductivity of a solution?

    A. They decrease conductivity

    B. They increase conductivity

    C. They have no effect on conductivity

    D. It depends on the concentration of the base

    Answer Explanation

    Bases increase the electrical conductivity of a solution. This is because bases ionize in water to produce hydroxide ions (\(OH^-\)), which carry an electric charge.

  • Q #3: Which of the following statements about the pH of bases is correct?

    A. Bases have a pH greater than 7

    B. Bases have a pH equal to 7

    C. Bases have a pH less than 7

    D. Bases have a pH of 7 and can vary based on concentration

    Answer Explanation

    Bases have a pH greater than 7 on the pH scale, indicating their alkaline nature. The pH of a base solution increases as the concentration of hydroxide ions (\(OH^-\)) increases.