How much aspirin will remain after 12 hours if a person took a single dose of 300 mg? the t½ of aspirin is 3 hours.

a. 100 mg
b. 37.5 mg
c. 18.8 mg
d. no right choice.

Which statement best describes the function of enzymes?

The human activities in two locations are described below: location a: rampant use of plastic containers location b: excessive use of pesticides and fertilizers which statement is most likely true? location a will have poor air quality because plastic is biodegradable. location a will experience water scarcity because plastic absorbs moisture. the population of honeybees will increase in location b because production of crops will increase. the population of fish in location b will decrease because the water is contaminated.

Analyze the reaction to determine whether the reaction is exothermic or endothermic. explain your reasoning.