1) Which best describes this sample of sulfur? a) A pure element b) A compound c) A mixture 2) True or False: Table salt (NaCl) is a compound. a) True b) False 3) True or False: Nitrogen gas (N2) is compound. a) True b) False 4) Is oxygen gas a compound, molecule, both, or neither a) compound b) molecule c) both d) neither 5) How many oxygen atoms are in an oxygen molecule? a) 1 b) 2 c) 0 6) Which molecule does this ball and stick represent? a) Hydrogen Peroxide (H2O2) b) Sodium Chloride (NaCl) c) Water (H20) 7) How many phosphorus atoms are in a phosphorus trichloride (PCl3) molecule? a) 1 b) 3 c) 4 8) How many atoms in total are in a phosphorus trichloride (PCl3) molecule? a) 1 b) 3 c) 4 9) Is phosphorus trichloride (PCl3) a compound, molecule, both, or neither? a) compound b) molecule c) both d) neither 10) How is the H2O molecule different from the H2O2 molecule? a) H2O has more hydrogen atoms than H2O2. b) H2O has more oxygen atoms than H2O2. c) H2O2 has 1 more oxygen atom than H2O. d) H2O2 has 1 more hydrogen atom than H2O. 11) Which molecule makes up about %80 of air? a) Nitrogen b) Oxygen c) Carbon Dioxide d) Water 12) How many elements (kinds of atoms) are in the caffeine molecule? a) 1 b) 24 c) 12 d) 4 13) How many atoms are in a caffeine molecule? a) 1 b) 24 c) 12 d) 4 14) Is this an element, compound, or mixture? a) Element b) Compound c) Mixture 15) Is this an element, compound, or mixture? a) Element b) Compound c) Mixture 16) Is this an element, compound, or mixture? a) Element b) Compound c) Mixture 17) Is this an element, compound, or mixture? a) Element b) Compound c) Mixture 18) Is graphite an element, compound, or mixture? a) Element b) Compound c) Mixture 19) What is the molecule that we breathe out that is also a greenhouse gas? a) Methane (CH4) b) Nitrogen Gas (N2) c) Carbon Dioxide (CO2) d) Oxygen Gas (O2) 20) What essential molecule makes up about 20% of air and is absorbed by our lungs? a) Methane (CH4) b) Nitrogen Gas (N2) c) Carbon Dioxide (CO2) d) Oxygen Gas (O2)
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Atoms, Elements, Molecules, Compounds Review
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