Statistics for Chemistry facts quiz

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Question	Answer	% Correct
what is a version of an atom element with the SAME NUMBER OF PROTONS but a DIFFERENT NUMBER OF NEUTRONS?	isotope	94%
in group seven, reactivity does what as you go down the group?	decreases	90%
In group one, reactivity does what as you go down the group?	increase	90%
what type of reaction is where energy is absorbed from the environment?	endothermic	77%
what type of reaction is where energy is released into the environment?	exothermic	77%
what is the number of electrons and protons represented by?	atomic number	69%
what does the mass number represent the total number of?	protons and neutrons	69%
mass / Mr is used to calculate the what? (think of the mammal)	moles	67%
what provides a surface upon which chemical reactions can take place with a lower activation energy?	catalyst	54%
what practical is used to calculate the concentration of one of the reactants?	titration	42%
Avogadro's constant states the the number of particles in one mole is what?	6.02*10^23	15%