If a substance has a half life of 45 days, how much of the original substance would be left after 90 days?

An unknown compound has the following chemical formula: Mg_xCl_2 where x stands for a whole number. Measurements also show that a certain sample of the unknown compound contains 6.80 mol of magnesium and 13.56 mol of chlorine.

Do any of the elements have similar properties?

How is the periodic table arranged (give two ways)

The knowledge of chemistry not important in one of the following? A, in agriculture B, in Geology C, in medicine D, none

Explain why many Lewis acids and bases are not classified as Arrhenius or Brønsted-Lowry acids and bases

Glucose is not made from which of the following

Rank the temperatures from the highest to the lowest. 133F 351K 25C 273K 146C 58F 95F

Calculate the density of sulfuric acid if 35.4 mL of the acid weighs 65.14 g.

Where the single machos?

A reaction will be spontaneous only at low temperatures if both ΔH and ΔS are negative. For a reaction in which ΔH = - 320.1 kJ/mol and ΔS = - 86.00 J/K · mol. Determine the temperature (in °C) below which the reaction is spontaneous.