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level: Elements and compounds

Questions and Answers List

Question	Answer
Is oxygen an element or a compound?	element
Is carbonate an element or a compound?	compound
Is helium an element or a compound?	element
Is hydroxide an element or a compound?	compound
Is carbon dioxide an element or a compound?	compound
Is gold an element or a compound?	element
Is ammonium an element or a compound?	compound
Is water an element or a compound?	compound
Is sugar an element or a compound?	compound
Is hydrogen an element or a compound?	element
Is salt an element or a compound?	compound
Is silver an element or a compound?	element
Using the law of the conservation of mass, when 40 grams of hydrogen reacts with oxygen to create 360 grams of water, how many grams of oxygen are needed?	320
Using the law of the conservation of mass, when hydrogen reacts with 640 grams of oxygen to create 720 grams of water, how many grams of hydrogen are needed?	80
Using the law of the conservation of mass, when 30 grams of hydrogen reacts with 240 grams of oxygen to create water, how many grams of water are produced?	270
Using the law of the conservation of mass, when 80 grams of hydrogen reacts with 640 grams of oxygen to create 720 grams of water, how many grams of hydrogen are needed to produce 900 grams of water?	100