Asubstance that enters into a chemical reaction is called a(n)

enzyme
reactant
catalyst
product

If 22.5 of nitrogen at 748 mm hg are compressed to 725 mm hg at constant temperature. what is the new volume?

How many peaks will be present in a mass spectrum for brcl?

Scientists are often interested in knowing the molar heat of combustion – the heat released during the combustion of one mole of a substance. use the periodic table to find molar masses. how many moles of ethanol are present in the sample?