1) A compound is made up of two or more ___________________ of atoms.  a) different types b) similar types c) bonded pairs d) identical sets 2) Matter is defined as anything that has ______________ and volume.  a) density b) mass c) length d) height 3) Oxygen is considered a(n) ____________________ because it is made of one type of atom. a) compound b) proton c) electron d) element 4) We identify elements by the number of _________________ in their nucleus. a) protons b) neutrons c) quarks d) electrons 5) A(n) ____________________ is a single type of atom. a) compound b) substance c) element d) nucleus 6) A molecule is made up of two or more __________________ bonded together. a) elements b) atoms c) compounds d) liquids 7) What is the orange part with the + on it? a) electron cloud b) nucleus c) electron d) proton e) neutron 8) What is the purple part with the - on it?  a) electron cloud b) nucleus c) electron d) proton e) neutron 9) What is the green part in the center of the model? a) electron cloud b) nucleus c) electron d) proton e) neutron 10) Which part of the picture represents the chemical symbol? a) 50 b) Sn c) Tin d) 118.711 11) Which part of the picture represents the atomic number?  a) 50 b) Sn c) Tin d) 118.711 12) Water (H 2 O) is an element. a) true b) false 13) NaCl (salt) is considered a compound.  a) true b) false 14) Electrons have no charge. a) true b) false 15) Which part of the chemical formula is the coefficient? a) H2 b) O4 c) 8 d) 4 16) What does the number 2 represent? a) coefficient b) subscript c) chemical formula d) element symbol 17) How many atoms of Oxygen are found in this chemical formula? a) 12 b) 22 c) 45 d) 11 18) How many atoms of carbon are found in this chemical formula? a) 5 b) 1 c) 20 d) 25 19) How many total atom are in this chemical formula? a) 12 b) 15 c) 3 d) 24 20) How many element are in this chemical formula? a) 3 b) 1 c) 2 d) 4

Flashback Quiz: Atoms, Elements, Molecules and Compounds

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