CHEM 120 MIDTERM REAL EXAM QUESTIONS WITH CORRECT ANSWERS

Which of the following hypotheses is NOT part of John Dalton's "Atomic Theory"? Mass is neither created nor destroyed What is the key feature of JJ Thomson's "plum pudding" model of the atom? The positive charge is concentrated in a nucleus In Rutherford's gold foil experiment, what result surprised him? A few alpha particles bounced back from the foil Isotopes have: The same number of protons but different numbers of neutrons The isotope Carbon-14 has how many neutrons? (The Z-value for C is 6) 8 Deuterium is heavier than Tritium. False Which of the following is an example of "allotropes"? Red and white forms of elemental phosphorus Which of the following is not an area of the periodic table? Conductors Which of the following elements is not naturally abundant? Curium (Z=96)