75.0 grams of unknown metal was heated to 95.0 ºC. It was then placed into 150 grams of water at 23.1 ºC. When the metal and water reached thermal equilibrium, the temperature was 27.8 ºC. Calculate the specific heat of the metal.

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.

Which one of the following bonds would you expect to be the most polar? a) b–h b) n–h c) p–h d) al–h e) c–h

How many atoms or molecules are there in a mole of a substance?