CHEM 1311.003

Exam 2

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1. A compound containing only nitrogen and oxygen is 63.65% nitrogen by mass, and the remainder of the mass is due to oxygen. What is the empirical formula of this compound?

a) N_{2}O | b) NO | c) NO_{2} | d) NO_{3} | e) N_{2}O_{5} |

2NO(g) + O

If 18.784 g NO and 13.215 g O

a) NO is the limiting reagent and 11.185 g NO

b) NO is the limiting reagent and 15.973 g NO

c) NO is the limiting reagent and 28.800 g NO

d) O

e) O

3. A sample of a gas is confined in a cylinder under a pressure of 3.182 atm at a temperature of 15.11 C. Initially, the volume of the gas is 9.162 L. If the pressure on the gas is increased to 6.741 atm and the temperature does not change, what will the new volume of the gas be?

a) 2.181 L | b) 4.325 L | c) 6.199 L |

d) 7.244 L | e) 8.917 L |

a) 5.21 atm | b) 3.87 atm | c) 2.45 atm |

d) 1.30 atm | e) 0.55 atm |

a) 1.117 g / L | b) 3.500 g / L | c) 4.992 g / L |

d) 6.105 g / L | e) 7.051 g / L |

C

If your set of coefficients happens to have a common factor other than one, divide all coefficients by the greatest common factor to get the chemical equation in lowest terms. When the equation is balanced using integers in lowest terms, the coefficient of O

a) 1 | b) 2 | c) 3 | d) 4 | e) 5 |

CaCl

is an example of what kind of reaction?

a) metathesis | b) displacement | c) decomposition | |

d) combination | e) combustion |

a) Pb(NO_{3})_{2} | b) Ba(C_{2}H_{3}O_{2})_{2} | c) CaCl_{2} |

d) AgCl | e) NaBr |

a) sodium phosphate | b) silver(I) nitrate |

c) potassium carbonate | d) calcium nitrate |

e) sodium acetate |

a) Only K^{+} | b) Only SO_{4}^{2-} |

c) Ca^{2+} and SO_{4}^{2-} | d) K^{+} and Cl^{-} |

e) K^{+} , Ca^{2+} , Cl^{-} , and SO_{4}^{2-} |

Last modified: Thursday June 18, 1998