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Unformatted text preview: CHM 2045C Practice Exam 1 1. Which of the following is a heterogeneous mixture? a. mortar (a mixture of calcium carbonate and sand) b. gasoline c. antifreeze (a mixture of water and ethylene glycol) d. sodium chloride dissolved in water e. the air trapped inside a balloon (not including the balloon) 2. A(n) ____ is a pure substance that is composed of only one type of atom. a. element b. homogeneous mixture c. heterogeneous mixture d. macroscopic particle e. particulate 3. Which statement concerning solid NaCl is true? a. NaCl is a chemical compound. b. NaCl is a homogeneous mixture. c. NaCl is a heterogeneous mixture. d. The percentage of Cl in NaCl is dependent on where the sample is obtained. e. NaCl has properties similar to it component elements, sodium metal and chlorine gas. 4. Which of the following is an extensive property? a. volume b. density c. melting point d. boiling point e. both melting and boiling point 5. The density of acetic acid is 1.05 g/mL. What is the volume of 327 g of acetic acid? a. 2.91 × 10-3 mL b. 3.21 × 10-3 mL c. 2.62 × 10 2 mL d. 3.11 × 10 2 mL e. 3.43 × 10 2 mL 6. All of the following are examples of chemical change EXCEPT a. the tarnishing of silver. b. the rusting of iron. c. the combustion of butane gas. d. the condensation of steam. e. the decomposition of water to hydrogen gas and oxygen gas. 7. Which one of the following is an example of physical change? a. the evaporation of water b. the rusting of iron c. the combustion of hydrogen d. the tarnishing of silver e. both the rusting of iron and the tarnishing of silver 8. Which is a correct method for converting Fahrenheit to Celsius? a. b. c. d. e. 9. The boiling point of liquid helium is 4 K. What is this temperature in Celsius?...
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- Spring '08
- Atom, Chemical element, d., A., c., good precision