PYP 001 First Major Code: Term: 132 Tuesday, March 11, 2014 Page: 1

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1 Term: 132 Tuesday, March 11, 2014 Page: 1 *The correct answer is the choice (A) for all questions. 1 is NOT a pure substance. A) An orange. B) Iron rust. C) Carbon dioxide. D) Neon (Ne). E) Dry ice. 2 In the diagrams below, each circle represents an element. Which diagram represents a homogeneous mixture? A) (III) B) (I) C) (II) D) (IV) E) (V) 3 Which one of the following is TRUE? A) Atoms cannot be seen directly even with a microscope. B) Matter can be classified as an element or a mixture C) Thoughts, ideas, and light are all examples of invisible matter. D) Air is a compound. E) Ammonia (NH 3 ) is a mixture of hydrogen and nitrogen atoms.

2 Term: 132 Tuesday, March 11, 2014 Page: 2 4 is an observable physical property. A) Texture 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) Iron melts at 1538 C. E) Chlorine is a pale yellow-green gas. 6 An example of a chemical change is. A) copper forming a green coating called a patina. B) crushing a piece of chalk. C) sanding a piece of wood into a baseball bat. D) sculpting clay. E) shaping metal into a wire. 7 Which of the following statements is FALSE? A) In any chemical change, the mass of the products is always less than the mass of the original substances. B) Temperature is an intensive physical property. C) Sublimation is a physical change. D) The color change of a banana is a sign for a chemical change. E) Food cooking is an example of a quick chemical change.

3 Term: 132 Tuesday, March 11, 2014 Page: 3 8 Which of the following statements is an example of condensation? A) After a hot shower, your bathroom mirror is covered with water. B) Water on the street turns to ice during a cold wintry night. C) Wet clothes dry on a clothesline. 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 10 L at 100ºC, what would be the volume of the gas at 0ºC? A) 7 L B) 12 L C) 10 L D) 11 L E) 13 L 10 Choose the wrong statement about evaporation. A) Occurs only when bubbles are formed. B) A slow process. C) Occurs at any temperature. D) A change of state from liquid to gas. E) Occurs only at the surface of a liquid.

4 Term: 132 Tuesday, March 11, 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 10 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) The particles in a crystalline solid are not arranged in any particular order. B) Quartz, salt, and sugar are all examples of crystalline solids. C) Have a definite shape and volume. D) Have a definite melting point. E) The particles vibrate about fixed points.

5 Term: 132 Tuesday, March 11, 2014 Page: 5 13 What is the atomic symbol for sodium-24 which has 13 neutrons? A) B) C) D) E) 24 Na Na Na Na Na If you have a one gram sample of each of the following: 40 K. Which sample contains more atoms? 19 A) All samples have equal number of atoms. B) 40 Ca 20 C) 40 Ar 18 D) 40 Cl 17 E) 40 K Ca, 40 Ar, 40 Cl, and 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 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.

6 Term: 132 Tuesday, March 11, 2014 Page: 6 16 Which of the following statements is TRUE? A) When uncontrolled nuclear chain reaction occurs in a large mass of material, a nuclear explosion is the result. B) Beta particles can penetrate an aluminum foil. C) Gamma ray has a positive electric charge. D) Fission reactions are a nearly ideal source of energy. E) Alpha particle is a helium atom. 17 A radioactive isotope has a half-life of 20 days. What is the amount of isotope left over after 100 days if the initial amount is 40 g? A) 1.25 g B) 2.5 g C) 5 g D) 10 g E) 20 g 18 Complete the following fission reaction: 1 n U 131 Sn Mo+ + energy A) n B) n C) D) E) 4 He e 1 n 0

7 Term: 132 Tuesday, March 11, 2014 Page: 7 19 Transuranium elements are rarely found in nature, this is because A) The nuclei of these elements have short half-lives. B) The nuclei of these elements have long half-lives. C) The nuclei of these elements are small and thus are unstable. D) The nuclei of these elements are large and thus are stable. E) These elements never existed on earth. 20 How many particles are emitted when polonium-218 ( Po) decays to polonium-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

PYP 001 First Major Code: Term: 133 Saturday, June 28, 2014 Page: 1

PYP 001 First Major Code: Term: 133 Saturday, June 28, 2014 Page: 1 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