CHEM 1411 FINAL EXAM

CHEM 1411 FINAL EXAM Which of these statements is false? A. Atoms of the same element can have different numbers of neutrons. B. Atoms of two different elements can have the same number of neutrons. C. Atoms of the same element can have different numbers of protons. - correct answer -C Which of the following is a chemical change? A. N2 (l) + O2 (l) - 2 NO (l) B. H2O2 (g) - H2O2 (s) C. CaCl2 (s) - CaCl2 (aq) D. All of the above are physical changes - correct answer -A The number of neutrons in Plutonium-240 is: A. 94 B. 146 C. 110 D. It depends on the isotope - correct answer -C Assume a beaker of pure ammonia (NH3) has been boiling for 30 minutes. What is in the bubbles in the boiling ammonia? A. Air B. Ammonia gas C. Heat D. Nitrogen gas - correct answer -B