Sample. Test Booklet. Subject: SC, Grade: HS STAAR April 2013 EoC Chemistry. - signup at to remove - Student name:
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1 Test Booklet Subject: SC, Grade: HS STAAR April 2013 EoC Chemistry Student name: Author: Texas District: Texas Released Tests Printed: Tuesday August 27, 2013
2 STAAR CHEMISTRY REFERENCE MATERIALS Page 1
3 Page 2
4 Page 3
5 Page 4
6 1 What is the formula of the ion hydrogen sulfite, which has a charge of -1? -1 A SO 3-1 B SO 4-1 C HSO 3-1 D HSO 4 2 What is the ph of a substance that has a hydrogen ion concentration of M? A 2.08 B 1.92 C 1.00 D Which of the following includes an example of a chemical property of an element? A Aluminum is a solid at room temperature and is a poor thermal insulator. B Sulfur is not shiny and is not malleable. C Sodium is a solid at room temperature and reacts with other elements. D Silicon is shiny and is a poor conductor of electricity. 4 Elements in a group of the periodic table are described below. Some Properties of a Certain Group of Elements Soft silvery-white color Good conductor of thermal energy Good conductor of electricity Atoms contain a single valence electron These elements most likely belong to which group? A Alkali metals B Alkaline earth metals C Halogens D Noble gases Page 5
7 5 The diagram below shows what happens when zinc reacts with hydrochloric acid. Which of these best describes the energy transformation that occurs during this reaction? A Thermal energy kinetic energy B Kinetic energy potential energy C Chemical energy thermal energy D Potential energy chemical energy Page 6
8 6 The diagram below represents a nuclear reaction. Which of the following best describes this reaction? A Nuclear fusion is occurring because many smaller nuclei are being fused. B Nuclear fission is occurring because large amounts of energy are being absorbed. C Nuclear fusion is occurring because many energetic neutrons are being emitted. D Nuclear fission is occurring because a nucleus is being split into smaller nuclei. 7 A detail from a label on a bottle of a water-softening agent is shown below. Which inference about the contents of the bottle can best be drawn? A They consist of barium chloride anhydrous. B They consist of barium chloride dihydrate. C They consist of barium chloride hexahydrate. D They consist of barium chloride heptahydrate. Page 7
9 8 Heart cells require a certain balance of sodium and potassium ions to function. The blood, which is approximately 83% water, carries these two types of ions to the heart. The property of water that allows it to carry ions to the heart is its - A molecular mass B specific heat C polarity D density 9 The equation below represents a chemical reaction that produces a gas. 2Na(s) + 2H 2 O (l) 2NaOH (aq ) + H 2 (g) What is the theoretical yield in liters of H 2 gas if 5.00 g of Na are completely reacted and the H 2 gas is collected at STP? A L B 2.44 L C 4.88 L D 5.09 L Page 8
10 10 Which of these is the electron-dot diagram for Br 2 (l)? A B 11 The table below lists some properties of a sample of lauric acid. Which of these is an intensive property of this sample? A Volume B Mass C Boiling point D Number of moles C D Page 9
11 12 When the equation below is balanced, what is the coefficient for oxygen? Answer: Page 10
12 13 Which mixture can be separated through filtration because one of the substances is insoluble in water? A NaClO 3 and Pb(ClO 3 ) 2 B Na 2 SO 4 and SrSO 4 C NaNO 3 andpb(no 3 ) 2 D NaC 2 H 3 O 2 and Pb(C 2 H 3 O 2 ) 2 Page 11
13 14 Some students used a variety of procedures to investigate four liquid samples. The students recorded the following information. When W was cooled, solid particles settled out of the liquid. The mass and volume of X were measured, and the density of X was calculated to be 1.6 g/ml. Y was heated, and the temperature was recorded. All the liquid boiled away at the same temperature and left no residue in the container. When a dilute acid was added to Z, gas bubbles formed and rapidly rose to the surface of the liquid. Based on these observations, which sample was clearly identifiable as a pure substance? A W B X C Y D Z 15 What is the electron configuration for an atom of germanium at ground state? A [Ar] 4 s 2 3 d 10 4 p 2 B [Ar] 4 s 2 4 d 10 4 p 2 C [Kr] 4 s 2 3 d 10 4 p 2 D [Kr] 4 s 2 4 d 10 4 p 2 16 Which of the following correctly matches a compound with its molecular geometry? A Water (H 2 O): linear B Carbon dioxide (CO 2 ): tetrahedral C Ammonia (NH 3 ): trigonal planar D Methane (CH 4 ): tetrahedral 17 A sample of a compound is added to distilled water in a clean beaker. A reaction occurs, and the water temperature drops rapidly. Which of the following statements is best supported by this observation? A An endothermic reaction occurred. B A dehydration reaction occurred. C The water was originally warmer than the compound. D The beaker was contaminated by another compound. Page 12
14 18 Use the equation below to answer the following question. BaCl 2 ( aq ) + Na 2 SO 4 ( aq ) 2NaCl( aq ) + BaSO 4 ( s ) The theoretical yield of BaSO 4 is g. If g of BaSO 4 are produced from the reaction shown above, what is the percent yield of BaSO 4? A 31.67% B 52.03% C 75.99% D 85.17% 19 When zinc is exposed to air, zinc oxide is produced. What happens in this reaction? A Zinc is oxidized, and oxygen is reduced. B Zinc is reduced, and oxygen is oxidized. C Both zinc and oxygen are oxidized. D Both zinc and oxygen are reduced. Page 13
15 20 The equation below represents a nuclear reaction. What is the mass number of the missing particle in this reaction? Answer: Page 14
16 21 The graph below shows a solubility curve for ammonia gas and solubility measurements taken at different temperatures. Solubility of Ammonia (NH3) Gas vs. Water Temperature Between which two points did the ammonia solution change from being unsaturated to saturated? A V W B W X C X Y D Y Z 22 How many molecules are in mole of N 2 O 5? A molecules B molecules C molecules D molecules Page 15
17 23 The following table lists some properties of copper and sulfur. s of copper metal and sulfur powder are placed in the same test tube and heated over a Bunsen burner. The resulting substance has the following properties. Does not conduct electricity Has a density of 5.6 g/cm 3 Has a metallic luster Is a black brittle crystalline solid This black substance is classified as - A a heterogeneous mixture B an element C a compound D a homogeneous mixture Page 16
18 24 The diagram below shows a gas with an initial pressure of 3060 mm Hg in a cylinder at a constant temperature. The gas expands inside the cylinder and pushes the piston up. What is the final pressure of the gas after the expansion? A 544 mm Hg B 784 mm Hg C 1830 mm Hg D 6212 mm Hg 25 Which of these statements is an accurate description of the ionization energies of elements in the periodic table? A The ionization energy of lithium is greater than that of potassium. B The ionization energy of iodine is greater than that of fluorine. C The ionization energy of magnesium is greater than that of sulfur. D The ionization energy of krypton is greater than that of neon. 26 Which of the following shows a correct Lewis dot structure? A B C D Page 17
19 27 What is the volume of 2.00 moles of chlorine (Cl 2 ) at STP, to the nearest tenth of a liter? Anser: Page 18
20 28 In a famous experiment conducted by Ernest Rutherford, positively charged alpha particles were scattered by a thin gold foil. Which of the following is a conclusion that resulted from this experiment? A The nucleus is negatively charged. B The atom is a dense solid and is indivisible. C The mass is conserved when atoms react chemically. D The nucleus is very small and the atom is mostly empty space. Page 19
21 29 The diagram below shows a battery giving off a current producing bubbles in two test tubes. Which of the following best shows that the investigation results in a chemical change? A Liquid condenses on a cold glass rod when gas from the test tube on the left is released. B A gas probe indicates that the water in the beaker contains dissolved nitrogen and oxygen. C A burning wood splint placed above the mouth of the test tube on the right glows brighter when some gas is released from the test tube. D The temperature of the wire connected to the battery increases. Page 20
22 30 A material safety data sheet (MSDS) for a chemical is shown below. Which of these is the IUPAC name for H 3 PO 4 ( aq )? A Trihydrogen phosphite B Phosphoric acid C Phosphorous hydroxide D Phosphorous acid Page 21
23 31 The diagram below shows part of Dmitri Mendeleev s original periodic table, with symbols of known elements and their atomic masses. Mendeleev s arrangement of elements is different than that of the modern periodic table. Based on Mendeleev s arrangement, which elements should be placed in the shaded boxes labeled X and Z respectively? A Indium (In), because it has a slightly higher atomic mass than aluminum (Al), and tin (Sn), because it has a slightly higher atomic mass than silicon (Si) B Cadmium (Cd), because it has chemical properties similar to those of zinc (Zn), and mercury (Hg), because it has chemical properties similar to those of arsenic (As) C Antimony (Sb), because it has a slightly higher atomic mass than zinc (Zn), and bismuth (Bi), because it also has a higher atomic mass than zinc (Zn) D Gallium (Ga), because it has chemical properties similar to those of aluminum (Al), and germanium (Ge), because it has chemical properties similar to those of silicon (Si) 32 Which particle has the lightest mass? A 2 4 He B 1 0 e C 1 1 H D 0 1 n Page 22
24 33 A 5.0 g sample of aluminum with a specific heat of 0.90 J/(g C) was heated from 22.1 C to 32.1 C. How much heat, to the nearest joule, did the aluminum gain? Answer: Page 23
25 34 Chemists can identify the composition of some unknown salts by conducting a flame test. When potassium salts are heated in a flame, a purple color is observed. This is due to the movement of electrons between energy levels. What is the electron configuration of a potassium atom at ground state? A 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 4 d 1 B 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 3 d 1 C 1 s 2 2 s 2 2 d 6 3 s 2 3 d 6 4 s 1 D 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 4 s 1 Page 24
26 35 Which product balances the chemical equation below? 3AgNO 3 ( aq ) + FeCl 3 ( aq ) 3AgCl( s ) + A FeCl( aq ) B FeCl 2 ( aq ) C FeNO 3 ( aq ) D Fe(NO 3 ) 3 ( aq ) 36 Sodium, mercury, argon, and neon are used in the production of lamps. There are fewer safety guidelines regarding the handling of neon and argon than for mercury and sodium. Which of the following best describes the elements within the group of the periodic table that contains neon and argon gas? A Gaseous at room temperature and highly reactive with metals B Solid at room temperature and mildly reactive with strong acids C Gaseous at room temperature and mostly unreactive with metals D Solid at room temperature and mostly unreactive with strong acids Page 25
27 37 The table below shows the standard enthalpy of formation for each of three substances. CaCO 3 decomposes according to the equation. What is the enthalpy of reaction? A kj B kj C kj D kj 38 What is the percentage by mass of sodium (Na) in a formula unit of sodium hydrogen carbonate (NaHCO 3 )? A 44.2% B 37.7% C 27.4% D 16.7% 39 A form of technetium-99 has a half-life of 40 How many atoms are present in g of approximately 6 hours. iridium? Tc e + γ Which substance correctly completes the equation above? A Mo B Te C Es D Ru A atoms B atoms C atoms D atoms Page 26
28 41 What volume of 1.0 M sodium phosphate, to the nearest tenth of a liter, must be used to make 4.0 L of 0.80 M sodium phosphate? Answer: Page 27
29 42 X-ray crystallography is a technique that allows scientists to determine the ionic and atomic radii of elements. Which of these statements correctly describes a trend in ionic or atomic radii in the periodic table? A The ionic radius decreases from top to bottom in a group. B The atomic radius increases from left to right across a period. C The ionic radius remains constant from right to left across a period. D The atomic radius increases from top to bottom in a group. 43 Which of the following substances is a strong electrolyte when dissolved in water? A NaNO 3 B C 2 H 5 OH C S 2 Cl 2 D C 12 H 22 O 11 Page 28
30 44 Which of the following best explains why doubling the temperature of an ideal gas in a closed vessel doubles the pressure? A Increasing the temperature increases the size of the gas molecules, which then can put more pressure on the vessel walls. B Increasing the temperature decreases the volume, causing molecules to strike the vessel walls more frequently. C Increasing the temperature causes gas molecules to collide more often and with enough force to displace electrons. D Increasing the temperature causes gas molecules to move more rapidly, striking the vessel walls more frequently and with greater force. 45 Which of the following diagrams correctly represents the formation of a compound consisting of magnesium and fluorine? A B 46 Which equation represents a neutralization reaction? A H 2 CO 3 ( aq ) CO 2 ( g ) + H 2 O( l ) B H 2 SO 4 ( aq ) + 2NaOH ( ag ) Na 2 SO 4 ( aq ) + 2H 2 O( l ) C 2H 2 ( g) + O 2 ( g ) 2H 2 O( l ) D 2Al(OH) 3 ( s ) Al 2 O 3 ( s ) + 3H 2 O( l ) C D Page 29
31 47 A scientist filters a sample of river water. The data from this process are listed below. These data support which of the following descriptions of the sample? A It is a pure substance because solid particles cannot pass through the filter paper. B It is a pure substance because the river water is composed only of free elements. C It is a mixture because dissolved ions in the water pass through the filter paper. D It is a mixture because solid particles are separated from the river water. 48 As a distant star moves away from Earth, the light given off by the star has a measurably lower frequency. What happens to the wavelength and energy of the photons of light when the frequency becomes lower? A The wavelength becomes longer, energy decreases. B The wavelength becomes shorter, energy decreases. C The wavelength becomes longer, energy increases. D The wavelength becomes shorter, energy increases. and the and the and the and the 49 Which of these is a postulate of kinetic molecular theory? A Molecules of gases have a finite volume. B Molecules of gases attract and repel one another. C Collisions between gas molecules are inelastic. D The kinetic energy of gas molecules depends on temperature. Page 30
32 50 The solubility of an unknown substance was tested during an experiment. Based on the solubility curve information and the results of the experiment, what is most likely the identity of this unknown solute? A NaCl B KCl C KNO 3 D NaNO 3 51 Which of the following best explains why CO 2 gas is easily compressible but solid CO 2 (dry ice) is incompressible? A The molecules of CO 2 gas are much closer together than the molecules in dry ice. B The molecules of solid CO 2 are much closer together than the molecules of CO 2 gas. C The molecules of CO 2 gas are much smaller than the molecules of solid CO 2. D The molecules of CO 2 gas attract one another, while the molecules of the solid CO 2 repel one another. 52 What is the chemical formula for disulfur decafluoride? A S 10 F 2 B S 3 F 9 C S 2 F 10 D S 2 F 8 Page 31 STOP
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