January 2003 Regents #1-10
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Questions 1-10 Questions 11-20 Questions 21-30 Questions 31-40 Questions 41-50 |
Questions | Answer | Explanations |
1 Which statement best describes electrons?
| 4 | Definiton of an electron |
2 During a flame test, ions of a specific metal are heated in the flame of a gas burner. A characteristic color of light is emitted by these ions in the flame when the electrons
| 3 | Definition of spectra production |
3 In which list are the elements arranged in order of increasing atomic mass?
| 1 | Use PT |
4 In which compound does chlorine have the highest oxidation number?
| 4 | Cl =-7 in NaClO4 |
5 Which event must always occur for a chemical reaction to take place?
| 3 | Effective collisions = a reaction |
6 Which Group of the Periodic Table contains atoms with a stable outer electron configuration?
| 4 | Noble gases group 18 |
7 From which of these atoms in the ground state can a valence electron be removed using the least amount of energy?
| 2 | Definition of Ionization Energy |
8 What is the percent by mass of oxygen in H2SO4 ? [formula mass = 98]
| 3 | (64/98) x 100% |
9 An atom of carbon-12 and an atom of carbon-14 differ in
| 2 | Isotopes different # neutrons so different mass number |
10 The strength of an atom’s attraction for the electrons in a chemical bond is the atom’s
| 1 | Definition-electronegativity |
Questions 1-10 Questions 11-20 Questions 21-30 Questions 31-40 Questions 41-50 |
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