(a) Name an element is the group called the halogens (name) (c) The name of the element whose symbol is Pb is (name)
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1 Name Exam 1 Page 1 1. (8 points) Periodic Table (a) Name an element is the group called the halogens (name) (b) The symbol for the element iron is (symbol) (c) The name of the element whose symbol is Pb is (name) (d) What transition metal is in Group 6B and in the 4th period? (name or symbol) (e) What element has an atomic number of 47? (name or symbol) (f) What element has the largest atomic weight in the 5th period? (name or symbol) (g) The element Ca is in the group called the (name) (h) What element has an atomic weight of g/mol? (name or symbol) 2. (19 points) Naming Compounds fill in the blanks in the table Cation Anion Name Formula 1. NH 4 + Ammonium carbonate 2. Nickel(II) phosphate 3. Ca 2+ Br - 4. Fe 3+ Fe(OH) 3 5. CH 3 CO 2 - Al(CH 3 CO 2 ) 3 6. Co 3+ Co 2 O 3 7. potassium sulfate å 8. sodium nitrite
2 Name Quiz Page 2 3. (5 points) Names of nonionic compounds. Supply the name or formula of the indicated compounds. Formula Name Ammonia Diphosphorus pentaoxide SO 3 Hydrogen iodide SiF 4 4. (20 points) Atomic Structure and Isotopes (a) What is the atomic number of strontium (Sr)? (b) What is the atomic weight of strontium (Sr)? (c) How many protons are there in an atom of strontium? (d) Is strontium a metal, nonmetal, or metalloid? (e) How many neutrons are there is an atom of 86 Sr? (f) The most common ion formed by strontium is and one of these ions would have electrons. (g) Strontium has three isotopes with an appreciable abundance: 86 Sr, 87 Sr, and 88 Sr. Which is the most abundant of these three? (h) If you have g of strontium, you have i x 10-3 mol ii. iii. iv mol 268 mol 373 mol (i) Suppose you have a piece of strontium containing 3.26 x 10-3 mol. How many atoms are there in the piece. i x atoms ii. iii. iv x atoms 3.26 x atoms 1.85 x atoms
3 Name Exam 1 Page 3 MOLECULES 1. (16 points) Nicotinic acid occurs in minute amounts in all living cells. Appreciable amonts are found in liver, milk, white meat, legumes, and whole cereals. HC HC H C N CH O C C Nicotinic acid OH (a) The molecular formula of nicotinic acid is (b) Based on your formula, the molar mass of nicotinic acid is (c) What is the weight percent of carbon in nicotinic acid? Show your work carefully and completely for parts c-f of this question. If no work is shown, no credit is given. (d) If you have g of nicotinic acid, what amount of the compound do you have (in moles)? (e) How many molecules of nicotinic acid are there in g? (f) How many C atoms are there in g of nicotinic acid?
4 Name Exam 1 Page 4 5. (3 points) Which sample contains the greatest number of atoms? (a) A sample of Cr that contains 8.77 x atoms (b) 6.87 mole of Al (c) 95 g of Li (c) They all have the same number of atoms. 6. (6 points) Capsaicin, the compound that makes chili peppers hot, has the formula C 18 H 27 NO 3. Its molar mass is g/mol. If you eat 55 milligrams of the compound you are consuming (a) 1.80 x 10-4 mol (b) 5.50 x 10-3 mol (c) mol (d) 5.55 mol What is the weight percent of carbon in capsaicin? (a) 3.93% C (b) 21.6% C (c) 31.4% C (d) 70.8% C 6. (3 points) A hydrocarbon (xylene) has the empirical formula C 4 H 5. Its molar mass is g/mol. The molecular formula of the compound is (a) C 4 H 5 (b) C 8 H 10 (c) C 12 H 15 (d) C 16 H 20 (e) None of the above.
5 Name Exam 1 Page 5 8. (3 points) The hydrocarbon cumene is 89.94% C. Its empirical formula is (a) CH 3 (b) C 2 H 5 (c) C 3 H 4 (d) C 4 H 7 9. (3 points) The mineral cerrusite, PbCO 3 (molar mass = g/mol), is a source of lead. What mass of cerrusite will provide 454 g of lead metal? (Assume the cerrusite is pure PbCO 3.) (a) g PbCO 3 (b) 1.70 g PbCO 3 (c) 585 g PbCO 3 (d) 721 g PbCO 3 10.(3 points) In lab experiment like the one you are doing this week, you heat a hydrated salt (CoCl 2 xh 2 O) to drive off the water and obtain the anhydrous salt. Mass of CoCl 2 xh 2 O = g Mass of CoCl 2 after heating to drive off the water = g Molar mass of CoCl 2 = g/mol The value of x in CoCl 2 xh 2 O (a) x = 1 (b) x = 2 (c) x = 4 (d) x = 6 (e) x = 8 (f) none of the above
6 Name Exam 1 Page (2 points) Circle all of the formulas below that are correct. (a) AlCl 2 (b) KF 2 (c) MgS (d) Ga 2 O (3 points) The mass of 2.50 mol of a compound with the formula ECl 4, in which E is a nonmetallic element, is 385 g. What is the identity of E? (a) C (b) Si (c) Pb (d) Ti 13. (6 points) You combine 1.25 g of germanium, Ge, chlorine, Cl 2. The mass of product, Ge x Cl y, is 3.69 g. What is the formula of the product, Ge x Cl y? Show your work completely and clearly. No credit is given if no work is shown.
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MOLES AND MOLE CALCULATIONS
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