When a solid melts
a. the temperature of the substance increases.
b. the temperature of the substance decreases.
c. heat energy leaves the substance.
d. heat energy enters the substance.?

Achemistry student needs to standardize a fresh solution of sodium hydroxide. he carefully weighs out of oxalic acid , a diprotic acid that can be purchased inexpensively in high purity, and dissolves it in of distilled water. the student then titrates the oxalic acid solution with his sodium hydroxide solution. when the titration reaches the equivalence point, the student finds he has used of sodium hydroxide solution.calculate the molarity of the student's sodium hydroxide solution. be sure your answer has the correct number of significant digits.

Which are forms of frozen water? check all that apply. dew frost hail rain sleet

How many moles of water are created if 3 moles of hydrogen react completely with excess oxygen?