Calcium Carbonate Is Used to Form Exoskeletons

question 3

Multiple Choice

Calcium carbonate is used to form exoskeletons. It has a solubility-product constant of 5.0 * 10^-9. What is the molar concentration of calcium ions in a saturated solution of calcium carbonate?

• A) 2.5 *10^-9 M
• B) 7.1 *10^-5 M
• C) 3.5 *10^-5 M
• D) 5.0 *10^-9 M
• E) 4.7 *10^-7 M

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Definitions:

Fixed Interval

A schedule of reinforcement where the first response is rewarded only after a specified amount of time has elapsed, in behavioral psychology.

Fixed Ratio

A schedule of reinforcement where a response is reinforced only after a specified number of responses, leading to a high and steady rate of response.

Variable Ratio

In operant conditioning, a reinforcement schedule that rewards an action after an unpredictable number of responses.

Variable Interval

A schedule of reinforcement where a response is rewarded after an unpredictable amount of time has passed, leading to responses at varying rates.