INS: 2.41, 2.09, 2.05, 250, 2 , 1) A sample of CaCO, was heated, causing it to f

Question

INS: 2.41, 2.09, 2.05, 250, 2 , 1) A sample of CaCO, was heated, causing it to form CaO and CO, gas. Solid CaO remained behind, while the CO, escaped to the atmosphere. If CaCO, weighed 612 g and the CaO we ched 343 g, how many grams of CO2 were formed in the reaction? 2) Which of the following isotope symbols can't be correct 3) How many protons and neutrons are in the nucleus of the following atoms? 4) Correct the error in each of the following statements: 26 23 27A3 s 64 Zn Pb (a) The formula of ammonia is NH3 (b) Molecules of potassium chloride have the formula KCl. (c) CI is a cation (d) CH, is a polyatomic ion. 5) What is the identifty of the element X in the following ions? (a) X2, a cation that has 36 elctrons. (b) X, an anion that has 36 electrons 6) Write formulas for the following compounds: (b) Iron(ID)cyanide (a) Calcium acetate (c) Sodium dichromate Chromium(lII)sulfate Mercury(II)perchlorate 7) Name the following binary molecular compounds: cci, ciO2 N20 N203 8) What are the formulas of the compounds formed from the following ions: Na and NO, K' and so, Sr and CI ) Write formulas for compounds of rubidium with each of the following: Brormine Nitrogenselenium 10) Write formulas for each of the following compounds: Sodium peroxide Aluminum bromide Chromium(III)sulfate

Explanation / Answer

CaCO3 ---------> CaO + Co2
1 mole of CaCo3 to gives 1 mole of CO2
100g of CaCO3 to gives 44g of CO2
612g of CaCo3 to gives = 44*612/100   = 269.28g of Co2

2.   2373Ge 21He
3.

         2713Al                   3216S                  3064Zn                   82207Pb

protons          13                           16                     30                            82

neutrons         14                         16                       34                           125

4. a.The molecular formula of ammonia    is NH3

   b. potassium chloride formula is KCl

   c. Cl^- is anion

   d.CH4 is polyatomic molecule

5. a. Sr

    b. Br

6. a. Ca(CH3COO)2

   b. Fe(CN)2

   c. Na2C2O7

   d. Cr2(SO4)3

   e. Hg(ClO4)2

7. CCl4 is carbon tetrachloride

     ClO2 is chlorine dioxide

     N2O3 dinitrogen troxide

8. NaNO3 , K2So4, SrCl2

9. Br2            N2              se

10. Na2O2               Al

    Br^-                      Cr2(SO4)3

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