A student was learning about elements. Which best describes elements? A. They cannot be combined with other substances.
B. They cannot be categorized as metals.
C. They cannot be broken down into simpler substances.
D. They cannot be separated from other substances.

How many grams of magnesium metal will react completely with 8.3 liters of 5.5m hcl? show all work

Find the number of moles of argon in 364g of argon.

Reacting masses1 calcium carbonate breaks down on heating to produce calcium oxide and carbondioxide gas.caco3 + cao + co2a student heats 15 g of calcium carbonate strongly in a crucible.relative atomic masses (a): ca = 40, c = 12, o = 16.calculate the mass of calcium oxide produced by this reaction.(5 marks)