What is the charge of the hydride ion?

Mary is conducting an experiment on how pollution affects plant growth. how can she ensure that her data are reliable?

What amount of heat is exchanged when 106.2 grams of substance y goes from a liquid at 35 degrees celsius to a solid at the same temperature? melting point of substance y = 35 degrees c; δhvaporization = 3.67 j/mol; δhfusion = 3.30 j/mol. mwsubstance y = 28.22 g/mol. −12.4 j −3.51 x 102 j 1.24 x 101 j 351 j

Anyone who's in connections academy chemistry b have the factors that affect the rate of a reaction portfolio already done?