Chemistry facts quiz

Random, core chemistry facts

present standard form as *10^Number

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Last updated: October 18, 2020

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Question	Answer
what is a version of an atom element with the SAME NUMBER OF PROTONS but a DIFFERENT NUMBER OF NEUTRONS?	isotope
Avogadro's constant states the the number of particles in one mole is what?	6.02*10^23
what does the mass number represent the total number of?	protons and neutrons
what is the number of electrons and protons represented by?	atomic number
In group one, reactivity does what as you go down the group?	increase
in group seven, reactivity does what as you go down the group?	decreases

Question	Answer
what provides a surface upon which chemical reactions can take place with a lower activation energy?	catalyst
what type of reaction is where energy is absorbed from the environment?	endothermic
what type of reaction is where energy is released into the environment?	exothermic
mass / Mr is used to calculate the what? (think of the mammal)	moles
what practical is used to calculate the concentration of one of the reactants?	titration