In a change the identity of the substance is
no changed, but only how the molecules of the substance are arranged
when the identity of a substance changes from compound to another a change takes place.

Clouds form when water vapor to form small droplets. a. humidifies b. condenses c. evaporates d. precipitates

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 of the following pairs of elements belong to the same groupa. h and he b. li and bec. c and pb d. ga and ge