What is the amount of heat, in joules, required to increase the temperature of a 49.5-gram sample of water from 22°C to 66°C?

(1) 9100 J

(2) 4600 J

(3) 1400 J

(4) 2300 J

How many hydrogen atoms are in Ca (CH₃COO) ₂?

Select the correct answer. Why does every chemical reaction require a certain amount of activation energy? O A Energy is released when the reactants begin to react. O B. Energy lost to the environment during the reaction must be replaced.

What are the repulsive forces

How does the number of molecules in 1 mol of oxygen compare with the number of molecules in 1 mol of nitrogen?

What type of air pollutant is produced in smoke from a fire? a. Chemical pollutant b. Cumulative pollutant c. Primary pollutant d. Secondary pollutant

What is the chemical formula of a compound that is composed of the ions Ca2 + and br-

What element is likely to form an ionic compound with chlorine?

Will a parachute slow a skydiver more at a very high altitude or a lower altitude?

Carbon monoxide is: Only found in large cities An odorless, colorless, toxic gas Healthy to breath in A danger when driving on the open highway

What is a potential benefit of fuel cell cars? increased efficiency converting gasoline to energy no recharging necessary decreased automobile cost larger engines