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Exam1_Yellow_Version

Exam1_Yellow_Version - 1(6 pts Name the following Compounds...

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Unformatted text preview: 1. (6 pts) Name the following Compounds: A1(0H)3 HI u m in ' r a CT(N03)3 Lhmmiu m ( E i Q ({7er a H2804 {.4 i a of 2. Consider the following species: 60Co”, 47Cr, 35C1”, 2‘Mggp' a) (4 pts) Which of these species has an equal number of protons and neutrons? l2 protons { '9 .memtfahs b) (4 pts) Which of these species has protons contributing more than 50% of the mass? ‘17 ‘ 2g profoMS $2qu 23 neutrons 3. (8 pts) Aluminum reacts with hydrochloric acid to produce aluminum chloride and hydrogen gas. Write the balanced equation for this reaction using integer coefficients. 91(5);_+3HCIx—a,. meg, +§H2£5) 2 ans) + 6 HUI—9 amen + 3Hgf5) 3 4. (6 pts) What is the oxidation state (number) for a) C in C204} + 3 b) s in st04 + 6 c) P in Mgszo, + 5 5. (4 pts) Determine the mass percent 0 in the mineral malachite, Cu2(OH)2CO3. 5 Oxwaems 50"”) 92 (.1 ll Chem. 1A 2003 Exam 1 Yellow Version I 0,362 6. Consider the reaction: 4A] (5) + 3 02 -——> 2 1°;le3 (s) Identify the limiting reagent for each of the following reaction mixtures. Show your work. N0 WORK = N0 CREDIT a) (5pts) 1.4 moles of Aland 1.1 moles of 02 . ,. 10 ["1 WI . moi A l J = 0.70 walrfllZOJ =7 Iii .is the limiting waged" b) (5 pts) 2.5 g of Al and 2.5 g of O2 2.59 HI :9 l is 444,, \IIW.‘£tha reaaevut (8 pts) A solid mixture contains 58.6% SIC]2 by mass. How many grams of the solidmixture containing the strontium chloride would you need to make 685 mL of a 0.100 M SrCl2 solution? 3M0, SrCh) :0'0635 wal Sr'Cla o. 635 L {2. ma L, 0.0685 rue/i swaps” : no.263 Se—Cla Mal a, 6 SrCl Chem. 1A 2003 Exam 1 Yellow Version 8. (6 pts) Circle the formula (only one) that best fits each of the following descriptions: a) greatest tendency to gain two electrons Sr C1 2 O I K b) soluble in water CaCO3 CaPC)4 ‘ Casflg 8560. Cat 5 c) weak electrolyte - HCl CHJCOOH ’CaCi, NaOH 9. You are provided with the reagents KZSO4(aq), BaSO4(s), KOH(aq), SrSO4(s), Sr(N03)2(aq). a) (6 pts) What reagents would you use to produce SrSO4 (s)? K1551: [.0 W 9—0003); (9“!) b) (4 pts) Write the net ionic equation for the formation of SrSO4i (s). 5rz+ + 50.12" ..—'9 SFSQH (5) 10. A precipitate is formed when 75.0 mL of 0.5 M barium nitrate reacts with 100.0 1111.. of 0.3 M potassium sulfate. a) (4 pts) Write the balanced molecular equation for this reaction. BMWQZ + K; SO... ——=> Ba 50.. (s) +2\<uo_g b) (6 pts) How many grams of the precipitate can be prepared if the reaction goes to completion? 0.0375 ml Eat/0903’): ”1::‘13’9‘50‘: (23:;333)= M. 0 030 Mal A’s/IflC:—___0k Em...____§__afl> 153-l33‘j __ ‘ a lmal ‘Wl (W "17' 9 5 11. (4 pts) When we touch something hot a signal is sent to our brain to allow us to quickly detect pain. Cells signal with salt. Ion transport through nerve cell membranes produces a signal that is conveyed from nerve cell to nerve cell. Ion transport involves primarily K“ and Na*. Indicate if the following statement is true or false? Circle the answer. Ion channels selectively admit Na” into cells rather than K‘” because Na+ is smaller than K+. True Chem. 1A 2003 Exam 1 Yellow Version , _ 4 12. In a beaker 18.5 mL of 0:26 Ml-INOl and 9.0 mL of 0.95 M KOH are mixed. a) (8 pts) Calculate the final concentrationof H+ and OH’ in solution after the reaction goes to completion. Show your work. H‘“'+ OH” ——> H O I‘M/{HM 0'05,ng 0003’6 moi iH+ = It’wif’n'ha reagent :7! [14" :0! [014:] awairé a. 0045*on .02].5 L b) (2 pts) Is the solution acidic, basic or neutral? ban 5 (C. 13. (10 pts) Magnesium has three stable isotopes with masses of 24.0, 25.0 and 26.0 respectively. A sample of magnesium contains 10.5% of the isotope 2‘Mg. What are the percentages of the g other two isotopes 24Mg and 26Mg? m x a 43mm“ at “ma 3 : frach’w of ‘76 Wig 5 am known-5 Sal ve qu + ”(0.105) + 563 : “.3157 aeqffls _X+'0.’05+ a 2' ‘00 ¥:-3+0.875 9"l(_'7+"'375)+ 25(0.I05)+26j= 2'4”?! U . u 9‘ 0 W ...
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