During a chemical reaction the atoms of one or more substance are rearranged to form different substances. true false

Which of the following did jj thompson discover about atoms? a)an atom has an internal structure. b) atoms are tiny indivisible particles. c)electrons orbit the nucleus of an atom. d) the nucleus of an atom contains protons and neutrons.

Which of the following units is not an official si unit? mole liter kilogram ampere

The number of moles of a given mass of a substance can be found without knowing its molecular formula or molar mass. true false