Term: 133 Saturday, June 28, 2014 Page: 1 *Read the following (20) questions and choose the right answer: 1 is Not a compound. A) Smoke. B) Iron rust. C) Carbon dioxide. D) Water. E) Dry ice. 2 In the diagrams below, each circle represents an element. Which diagram(s) represent(s) a pure substance? A) (IV) and (V) B) (III) and (IV) C) (IV) only. D) (I) and (II) E) (I) and (III). 3 Which one of the following is TRUE? A) Ocean water is a homogeneous mixture. B) Matter can be classified as an element or a compound. C) Light is an invisible matter. D) Air is a pure substance. E) Hydrogen peroxide (H 2 O 2 ) is a mixture of hydrogen and oxygen atoms.
Term: 133 Saturday, June 28, 2014 Page: 2 4 is an observable physical property. A) State of matter B) Boiling point C) Density D) Mass E) Length 5 Which of the following is a chemical property? A) Gold doesn t rust. B) Water has a density of 1000 kg/m 3 C) Mercury is a liquid metal. D) None of these E) Chlorine is a pale yellow-green gas. 6 An example of a chemical change is. A) Cooking. B) Crushing a piece of chalk. C) Sanding a piece of wood into a baseball bat. D) Boiling of water. E) Shaping metal into a wire. 7 Which of the following statements is FALSE? A) None of these. B) Temperature is an intensive physical property. C) Condensation is a physical change. D) The color change of an apple is a sign for a chemical change. E) Burning is an example of a quick chemical change.
Term: 133 Saturday, June 28, 2014 Page: 3 8 Which of the following statements is an example of evaporation? A) Wet clothes dry on a clothesline. B) Water on the street turns to ice during a cold wintry night. C) After a hot shower, your bathroom mirror is covered with water. D) Your tea-kettle whistles when the water is ready for tea. E) Snow on the ground turns to liquid water. 9 A student is measuring the volume and the temperature of a gas while keeping its pressure constant. If the volume of the gas was 7 L at 0ºC, what would be the volume of the gas at 100ºC? A) 10 L B) 7 L C) 5 L D) 3 L E) 1 L 10 Choose the correct statement about boiling. A) The boiling point depends on the atmospheric pressure. B) A slow process. C) Occurs at any temperature. D) A change of state from gas to liquid. E) Occurs only at the surface of a liquid.
Term: 133 Saturday, June 28, 2014 Page: 4 11 The following graph is a heating curve for chloroform, a solvent for fat, oils, and waxes. What is the state of this matter at 0 C? A) Liquid. B) Solid. C) Gas. D) A mixture of solid and liquid. E) A mixture of liquid and gas. 12 Which one of the following statements is wrong about crystalline solids? A) Do not have a definite shape and volume. B) Quartz, salt, and sugar are all examples of crystalline solids. C) The particles in a crystalline solid are arranged in particular order. D) Have a definite melting point. E) The particles vibrate about fixed points.
Term: 133 Saturday, June 28, 2014 Page: 5 13 What is the atomic symbol for carbon-13 which has 7 neutrons? A) B) C) D) E) 13 C 6 13 C 7 13 6 C 7 C 13 20 C 6 14 If you have a one gram sample of each of the following hydrogen isotopes: 3 H, and 4 H. Which sample contains more atoms? 1 1 A) 1 H 1 B) All samples have equal number of atoms. C) 1 2 H 1 H, 2 H, 1 1 D) E) 3 H 1 4 H 1 15 There are four stable isotopes of strontium, Sr-84, Sr-86, Sr-87, and Sr-88. If the atomic mass of strontium is recorded in the periodic table as 87.62 amu, which isotope is most abundant in a sample of strontium? A) Sr-88. B) Sr-87. C) Sr-86. D) Sr-84. E) Their abundances are equal.
Term: 133 Saturday, June 28, 2014 Page: 6 16 Which of the following statements is FALSE? A) Alpha particle is a helium atom. B) Beta particles cannot penetrate an aluminum foil. C) Gamma ray has no electric charge. D) Fusion reactions are a nearly ideal source of energy. E) When uncontrolled nuclear chain reaction occurs in a large mass of material, a nuclear explosion is the result. 17 A radioactive isotope has a half-life of 25 days. What is the amount of isotope left over after 100 days if the initial amount is 40 g? A) 2.5 g B) 1.25 g C) 5 g D) 10 g E) 20 g 18 Complete the following fission reaction: 1 n + 235 U? + 103 Mo+2 1 n+ energy 0 92 42 0 A) B) C) D) E) 131 Sn 132 Sn 236 U 92 129 Sn 130 Sn
Term: 133 Saturday, June 28, 2014 Page: 7 19 The figure below shows three types of radiation and their relative penetrating power. Based on this figure one may conclude that the penetrating power A) decreases with increasing charge of the emitted radiation. B) increases with increasing charge of the emitted radiation. C) is independent of the charge of the emitted radiation D) of α particles is the highest. E) of γ rays is the lowest. 20 How many particles are emitted when polonium-218 ( 218 84 Po) decays to polonium-214 ( 84 214 Po)? A) 1 α and 2 β's B) 2 α's and 1 β C) 2 α's D) 2 β's E) 1 α