Sample examII - 2 can be formed? CaH 2 (s) + 2H 2 O...

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1. Rank the UV, WX, and YZ bonds in order of increasing polarity. (lowest<highest) V U W X Y Z e n r g y a. WX<VU<YZ b. VU<WX<YZ c. YZ<VU<WX d. WX<YZ<VU 2. Which of the following represent Lewis structure of ClO 2 -1 ? a. Cl O O b. Cl O O c. Cl O O d. Cl O O 3. What is the oxidation state of the carbon atom shown with (*)? O C H H * a. 0 b. -1 c. +2 d. +4 4. List the following in order of increasing C=O bond lengths. (lowest<highest) O C H H I II III O C O H O C O O a. I<II<III b. III<II<I c. II<I<III d. The same 5. How many lone pairs are missing in the following molecule? C C O H H H H H H a. 2 b. 1 c. none d. 3 6. Consider the reaction of 0.4 mol K with O 2
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K+O 2 --> K 2 O How many moles of molecular oxygen are required? (Balance the equation) a. 0.1 b. 0.4 c. 1 d. 2 7. What is mass of 0.137 mol CaCO 3 ? a. 13.7g b. 100 g c. 1 g d. 6.02x10 23 g 8. If 10 g of CaH 2 reacts with 9 g of H 2 O, what mass of Ca(OH)
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Unformatted text preview: 2 can be formed? CaH 2 (s) + 2H 2 O --&gt; Ca(OH) 2 + 2H 2 a. 17.6 g b. 18.5 g c. 9 g d. 7 g 9. The total number of covalent bonds in the H 2 molecule is __________. a. 1 b. 2 c. none d. 3 10. How many atoms are in 23g Na? a. 6.02x10 23 b. 23 c. 1 d. 11 11. Which of the following Lewis structure is not correct? a. N O O O b. O H H c. S O O O O d. C H H H H 12. Which bond is more polar? a. H-F b. H-H c. H-Cl d. H-I 13. How many atoms are in a molecule of H 2 O? a. 3 b. 18 c. 6.02x10 23 d. 1.8x10 23 14. How many grams of O 2 are contained in 2 moles of O 2 ? a. 64 b. 32 c. 16 d. 8 15. How many polar covalent bond are in a PH 3 molecule? a. 3 b. 1 c. none d. 4 16. When the equation ___CH 4 + ___O 2--&gt; ___CO 2 + ___H 2 O is balanced, one of the terms in the balanced equation is a. 2O 2 b. 4H 2 O c. 2CO 2 d. 2CH 4...
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Sample examII - 2 can be formed? CaH 2 (s) + 2H 2 O...

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