Standard temperature and pressure are defined as a) 0 k and 1 kpa b) 0°c and 101.3 kpa c) 0 k and 101.3 kpa d) 0°c and 1 kpa

In a popular classroom demonstration, solid sodium is added to liquid water and reacts to produce hydrogen gas and aqueous sodium hydroxide. part a write a balanced chemical equation for this reaction. express your answer as a chemical equation. identify all of the phases in your answer.

Apeak with a retention time of 407 s has a width at half-height (w1/2) of 7.6 s. a neighboring peak is eluted 17 s later with a w1/2 of 9.4 s. a compound that is known not to be retained was eluted in 2.5 s. the peaks are not baseline resolved. how many theoretical plates would be needed to achieve a resolution of 1.5?

Which part of earth’s surface receives the most direct rays from the sun? a) equator b) ocean c) poles d) mountains