1. The compound formed between element X and oxygen has the chemical formula X. 4. Which correctly lists four atoms from smallest to largest radii?

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1 North arolina Testing Program EO hemistry Sample Items Goal 3 1. The compound formed between element X and oxygen has the chemical formula X 2O. Which element would X most likely represent? Fe Zn 4. Which correctly lists four atoms from smallest to largest radii? I, r, l, F F, I, r, l Si, P, S, l l, S, P, Si g Sn 5. Which best explains why cations are smaller than the atoms from which they are formed? 2. Which electron configuration represents a transition element? The metallic atom gains electrons, causing a larger effective nuclear pull s 2s 2p s 2s 2p 3s The metallic atom loses electrons, resulting in loss of an entire energy level s 2s 2p 3s 3p 4s 3d s 2s 2p 3s 3p 4s 3d 4p 3. Given the electronic configuration of s 2s 2p, how many electrons does this element have in its outer level? The nonmetallic atom gains electrons, causing a larger effective nuclear pull. The nonmetallic atom loses electrons, resulting in loss of an entire energy level. Page 1

2 North arolina Testing Program EO hemistry Sample Items Goal 3 6. Which have the lowest electronegativities? 9. How many molecules are contained in 55.0 g of H SO? 2 4 alkali metals molecule halogens 3.93 molecules rare earth elements transition metals molecules molecules 7. How many moles are in 59.6 grams of aso? mole 3.91 moles 13.9 moles 59.6 moles 10. If a sample of magnesium has a mass of 60. g, how many moles of magnesium does the sample contain? 1.1 moles 1.2 moles 2.0 moles 2.5 moles 8. What is the volume of two moles of hydrogen gas at STP? 44.8 L 22.4 L 11.2 L 2.00 L 11. How many grams of Kl are necessary to prepare 1.50 liters of a M solution of Kl? 224 g 74.6 g 56.0 g 24.9 g Page 2

3 North arolina Testing Program EO hemistry Sample Items Goal What is the molarity of a solution containing 20.0 g of sodium hydroxide dissolved in 1.00 L of solution? M M M M 15. What is the percent by mass of iron in the compound Fe O? 70% 56% 48% 30% nalysis shows a compound to be, by mass, 43.8% N, 6.2% H, and 50.0% O. Which is a possible molecular formula for the substance? NH4NO2 NH4NO3 NH3OH NOH Metallic sodium reacts violently with water to form hydrogen and sodium hydroxide according to the balanced equation: 2Na + 2H O 2NaOH + H 2 2 How many moles of hydrogen gas are generated when 4.0 moles of sodium react with excess water? 1.0 mole 2.0 moles 14. compound has an empirical formula of H2O and a molecular mass of 180 g. What is the compound s molecular formula? HO H 6 12O6 H 6 11O7 12H22O moles 4.0 moles Page 3

4 North arolina Testing Program EO hemistry Sample Items Goal onsider this reaction: 3a ( s) + 2H PO ( aq) a (PO ) ( s) + 3H ( g) How many moles of calcium are required to produce 60.0 g of calcium phosphate? mole mole mole mole 18. ccording to the equation 2H2O ( l) 2H 2 ( g) + O 2 ( g), what mass of HO 2 is required to yield 22.4 L of O2 at STP? 12 g 18 g 24 g 36 g Page 4

5 North arolina Testing Program EO hemistry Sample Items Goal onsider this reaction: 3Mg ( s) + 2H PO ( aq) Æ Mg (PO ) ( s) + 3H ( g) How many grams of magnesium phosphate should be produced if 5.40 grams of magnesium react with excess phosphoric acid? 1.80 grams 19.5 grams 58.4 grams 175 grams 20. Methane (H 4) is burned in oxygen according to this balanced chemical equation: H () g + 2O () g Æ O () g + 2HO () g What volume of carbon dioxide is formed when 9.36 liters of methane are burned in excess oxygen at STP? 9.36 L 15.0 L 18.7 L 22.4 L End of Goal 3 Sample Items In compliance with federal law, including the provisions of Title IX of the Education mendments of 1972, the epartment of Public Instruction does not discriminate on the basis of race, sex, religion, color, national or ethnic origin, age, disability, or military service in its policies, programs, activities, admissions or employment. Page 5

6 EO hemistry Goal 3 Sample Items Key Report 1 Objective: 3.01 nalyze periodic trends in chemical properties and use the periodic table to predict Thinking Skill: pplying orrect nswer: 2 Objective: 3.01 nalyze periodic trends in chemical properties and use the periodic table to predict Thinking Skill: nalyzing orrect nswer: 3 Objective: 3.01 nalyze periodic trends in chemical properties and use the periodic table to predict Thinking Skill: pplying orrect nswer: 4 Objective: 3.01 nalyze periodic trends in chemical properties and use the periodic table to predict Thinking Skill: Organizing orrect nswer: 5 Objective: 3.01 nalyze periodic trends in chemical properties and use the periodic table to predict Page 1 educational purposes only; not for personal or financial gain.

7 EO hemistry Goal 3 Sample Items Key Report Thinking Skill: nalyzing orrect nswer: 6 Objective: 3.01 nalyze periodic trends in chemical properties and use the periodic table to predict Thinking Skill: Organizing orrect nswer: 7 Objective: 3.02 pply the mole concept, vogadro s number and conversion factors to chemical Thinking Skill: pplying orrect nswer: 8 Objective: 3.02 pply the mole concept, vogadro s number and conversion factors to chemical Thinking Skill: pplying orrect nswer: 9 Objective: 3.02 pply the mole concept, vogadro s number and conversion factors to chemical Thinking Skill: pplying orrect nswer: 10 Objective: 3.02 pply the mole concept, vogadro s number and conversion factors to chemical Page 2 educational purposes only; not for personal or financial gain.

8 EO hemistry Goal 3 Sample Items Key Report Thinking Skill: pplying orrect nswer: 11 Objective: 3.02 pply the mole concept, vogadro s number and conversion factors to chemical Thinking Skill: pplying orrect nswer: 12 Objective: 3.02 pply the mole concept, vogadro s number and conversion factors to chemical Thinking Skill: pplying orrect nswer: 13 Objective: 3.02 pply the mole concept, vogadro s number and conversion factors to chemical Thinking Skill: pplying orrect nswer: 14 Objective: 3.02 pply the mole concept, vogadro s number and conversion factors to chemical Thinking Skill: pplying orrect nswer: 15 Objective: 3.02 pply the mole concept, vogadro s number and conversion factors to chemical Page 3 educational purposes only; not for personal or financial gain.

9 EO hemistry Goal 3 Sample Items Key Report Thinking Skill: pplying orrect nswer: 16 Objective: 3.03 alculate quantitative relationships in chemical reactions (stoichiometry). Thinking Skill: pplying orrect nswer: 17 Objective: 3.03 alculate quantitative relationships in chemical reactions (stoichiometry). Thinking Skill: pplying orrect nswer: 18 Objective: 3.03 alculate quantitative relationships in chemical reactions (stoichiometry). Thinking Skill: pplying orrect nswer: 19 Objective: 3.03 alculate quantitative relationships in chemical reactions (stoichiometry). Thinking Skill: pplying orrect nswer: 20 Objective: 3.03 alculate quantitative relationships in chemical reactions (stoichiometry). Thinking Skill: Integrating orrect nswer: Page 4 educational purposes only; not for personal or financial gain.

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