2003 August Chemistry Regents Exam #11-20

Questions 1-10 Questions 11-20 Questions 21-30 Questions 31-40 Questions 41-50

highlight to reveal answers and explanations


Questions	Answers	Explanations
11. Which type of bond is formed when electrons are transferred from one atom to another? A, covalent B. ionic C. hydrogen D. metallic	B	ionic -transferred covalent-sharing
12. Which Lewis electron-dot structure is drawn correctly for the atom it represents? A. B. C. D.	D	Ne has 8 valence electrons so 8 dots
13. What occurs when an atom of chlorine forms a chloride ion? A. The chlorine atom gains an electron, and its radius becomes smaller. B. The chlorine atom gains an electron, and its radius becomes larger. C. The chlorine atom loses an electron, and its radius becomes smaller. D. The chlorine atom loses an electron, and its radius becomes larger.	B	nonmetals gain electrons to fill their valence shell they get larger the ratio of electrons to protons is bigger
14. Which substance can not be decomposed by a chemical change? A. Ne B. N₂O C. HF D. H₂O	A	Definition of an element Compounds can be broken down
15. Which of these substances has the strongest intermolecular forces? A. H₂O B. H₂S C. H₂Se D. H₂Te	A	Typical hydrogen bonding question notice all answers have H Hydrogen bonding involves H bonded to " F O N" strongest dipole dipole attraction
16. A real gas behaves more like an ideal gas when the gas molecules are A. close and have strong attractive forces between them B. close and have weak attractive forces between them C. far apart and have strong attractive forces between them D. far apart and have weak attractive forces between them	D	gases are very far apart and have very little attraction liquids would be close together and have attraction
17. Which phase change is an exothermic process? A. B. C. D.	B	You must lose energy to condense. OR S---------->G S L<----G S--->L S L---->G notice only one is going left
18. Which of these contains only one substance? A. distilled water B. sugar water C. saltwater D. rainwater	A	all the others are mixtures
19. In which group of the Periodic Table do most of the elements exhibit both positive and negative oxidation states? A. 17 B. 2 C. 12 D. 7	A	look at the elements on the PT
20. At the same temperature and pressure, 1.0 liter of CO(g) and 1.0 liter of CO2(g) have A. equal masses and the same number of molecules B. different masses and a different number of molecules C. equal volumes and the same number of molecules D. different volumes and a different number of molecules	C	Avogadros Hypothesis-equal volumes of gases contain the same number of particles