A chemical reaction was used to separate a sample into its components. What conclusion about the sample can be formed based on the technique used? It was a pure substance.
It was a compound.
It was a heterogeneous mixture.
It was a homogeneous mixture

A5.000 g sample of niso4 h2o decomposed to give 2.755 g of anhydrous niso4. what is the formula of the hydrate? what is the full chemical name for the hydrate? what is the molar mass of the hydrate? niso4•_h2o what is the mass % of water in the hydrate?

8.98 dm3 of hydrogen gas is collected at 38.8 °c. find the volume the gas will occupy at -39.9 °c if the pressure remains constant.

Elements in group 2 are all called alkaline earth metals. what is most similar about the alkaline earth metals?