4. Which of the following processes describes a physical change of matter? D. the combustion of gasoline producing water and carbon dioxide
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1 1. Which of the following is a liquid at room temperature? A. oxygen C. salt B. copper D. mercury 2. Which of the following compositions of matter is a pure substance? A. water C. 2% milk B. wet sand D. sweet tea 3. Which of the following is a compound? A. magnesium C. nickel(ii) sulfide B. oxygen D. helium 4. Which of the following processes describes a physical change of matter? A. the oxidation of methanol (CH 3 OH) to formaldehyde (CH 2 O) upon ingestion B. the rusting of iron to form iron oxide C. the distillation of ethanol (CH 3 CH 2 OH) from a mixture of ethanol and water D. the combustion of gasoline producing water and carbon dioxide 5. Thermal energy is A. always conserved. B. the energy associated with the temperature of an object. C. the energy associated with the position of an object. D. associated with the effect of gravity of an object. 6. Which of the following prefix multipliers is the result of this calculation? ( ) ( ) = A. milli C. mega B. micro D. nano
2 7. In scientific notation, is expressed as A C B D A copper cube has a mass of 62.7 g. What is the length of the edge of the cube? (density of copper = 8.96 g/cm 3 ) A cm C cm B cm D cm 9. What is the density of an object with a mass of g and a volume of 12.1 ml? A g/ml C g/ml B g/ml D g/ml 10. Which property of matter is the most useful for identifying an unknown substance? A. mass C. density B. volume D. weight 11. Which answer should be reported, with the correct number of significant figures, for the following calculation? =? A. 100 C B D. 99.7
3 12. What is the result of the following calculation? =? A C B D How is a wavelength of m expressed in nm? A nm C nm B. 760 nm D nm 14. If NASA developed a spacecraft capable of traveling at half the speed of light, how many years would it take the craft to travel to Proxima Centauri, a star approximately miles away from Earth? speed of light = m/s; 1.00 mile = km A years C years B years D. 223 years 15. Which of the following statements is not consistent with Dalton's Atomic Theory? A. All atoms of chlorine have identical properties that distinguish them from other elements. B. An atom of nitrogen can be broken down into smaller particles that still have the unique properties of nitrogen. C. Atoms of sodium do not change into atoms of another element during chemical reaction with chlorine. D. One carbon atom combines with one oxygen atom to form a molecule of carbon monoxide.
4 16. An automobile gasoline tank holds 21 kg of gasoline. When all of the gasoline is consumed, 86 kg of oxygen is consumed as well. If the only products of the reaction are carbon dioxide and water vapor, what is the mass of the products? A. 107 kg C. 60 kg B. 44 kg D. 18 kg 17. In a neutral atom, the mass number equals A. the sum of the number of electrons and neutrons. B. twice the number of protons. C. the sum of the number of electrons and protons. D. the sum of the number of protons, neutrons, and electrons. 18. Which group identifies each particle with its charge? A. proton +1, neutron 1, electron 0 B. proton +1, neutron 0, electron 1 C. proton 1, neutron 0, electron +1 D. proton 0, neutron +1, electron Which element does X represent in the following symbol? X A. nickel C. sulfur B. zinc D. silicon
5 20. Complete the following table: Atomic Number Charge Electrons Ion Symbol 8 2 W = X = 55 Y = 54 Z = A. W= 10, X = O 2, Y = 1+, Z = Cs + B. W = 8, X = O 2, Y = 1, Z = Mn + C. W = 8, X = O 2+, Y = 1+, Z = Mn + D. W = 6, X = O 2+, Y = 1+, Z = Cs Which of the following is a transition element? A. K C. F B. Sn D. Pd 22. Chlorine has an average atomic mass of amu and consists of two stable isotopes, 35 Cl and 37 Cl. 35 Cl has a mass of amu and 37 Cl has a mass of amu. What is the natural abundance of 37 Cl? A. 50% C. 33% B. 24% D. 66% 23. Naturally occurring gallium has two stable isotopes and an atomic mass of amu. If 69 Ga ( amu) is 60.11% of natural Ga, what is the mass of the other isotope? A amu C amu B amu D amu
6 24. Which of the following statements is not correct? A g of tungsten and g of boron contain the same number of atoms. B. Avogadro s number is equal to the number of atoms in exactly 12 g of pure 12 C. C. One mole of oxygen atoms contains more atoms than one mole of carbon atoms. D. Two moles of ammonia (NH 3 ) contains the same number of nitrogen atoms as one mole of nitrogen gas (N 2 ). 25. How many atoms are contained in 5.92 g of methane (CH 4 )? A atoms C atoms B atoms D atoms 26. Which of the following molecules has a molecular formula that is the same as the empirical formula of the other three? A. C. B. D.
7 27. Which of the following is an ionic compound? A. LiCl C. PCl 3 B. NO 2 D. CF What is the chemical formula of sodium hypochlorite? A. NaClO 2 C. Na 2 CrO 4 B. NaClO D. NaHCO What is the chemical name of CS 2? A. carbon sulfide C. dicesium B. carbon disulfide D. carbon(iv) sulfide 30. Naturally occurring fluorine has only one stable isotope. Which statement is true for the most stable ion of fluorine? A. The number of protons equals the number of electrons. B. The number of protons is larger than the number of electrons. C. The number of neutrons equals the number of electrons. D. The sum of the number of protons, neutrons, and electrons equals 19.
8 Answer Key: 1. D 2. A 3. C 4. C 5. B 6. D 7. D 8. A 9. C 10. C 11. D 12. C 13. A 14. B 15. B 16. A 17. A 18. B 19. D 20. A 21. D 22. B 23. A 24. C 25. C 26. D 27. A 28. B 29. B 30. C
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