More Chemistry

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1) Which element has the following configuration [Ar] 4s23d10? 
a) P
b) Zn
c) Cl 
d) Au

3) Which of the following exhibits the correct orders for both increasing atomic radius and increasing ionization energy, respectively?

1. S, O, F and F, O, S
2. F, O, S and S, O, F
3. F, S, O and O, S, F
4. S, F, O and S, F, O

6) How many atoms of hydrogen are contained in 1.0 mole of CH4?
a) 6.02 x 1023 atoms
b) 2.4 x 1024 atoms
c) 3.01 x 1024 atoms 
d) 4 atoms


7) What is the percent of iron by mass in a pure sample of Fe3O4?
a) 72%
b) 28 %
c) 30% 
d) 0.72 %


8) A compound is 56.8 % C, 6.56 % H, 8.28 % N and 28.4% O. What is the empirical formula of the compound?
a) C8H11NO3
b) C4H11NO6 
c) C5H5NO3 
d) C4H5N2O3


9) Calculate the number of moles in 4.56 g of ethanol (CH3CH2OH):
a) 0.1 moles
b) 10 moles
c) 2 moles
d) 6.022 x 1023 moles


10) If 39.0 g of C6H6 reacts with excess chlorine and produces 30.0 g of C6H5Cl in the reaction:
C6H6 + Cl2 => C6H5Cl + HClWhat is the percent yield of C6H5Cl?
a) 13.2 % 
b) 76.9 % 
c) 50% 
d) 53.4 %

11) Consider the reaction:
CaCN2 + H2O => CaCO3 + NH3
How much CaCO3 is produced if 47.50 moles NH3 are produced?

1. a)  2375 g
2. b)  4750 g
3. c)  23.8 g
4. d)  0.238 g

12) What mass of O2 is required to produce 14.5 g of CO2 if the reaction has a 65.0 % yield?
CH4 + O2 => CO2 + H2O

1. a)  21.2 g
2. b)  16.2 g
3. c)  13.7 g
4. d)  32.4 g

13) The empirical formula of styrene is CH; its molecular formula mass is 104.1g/mol. What is the molecular formula of styrene?
a) C2H4
b) C8H8
c) C6H6 
d) C10H12


14) When 125.0 g of ethylene (C2H4) burns in oxygen. How many grams of CO2 are formed?
a) 392.9 g
b) 250.0 g 
c) 57.50 g 
d) 327.0 g


15) 15 g sample lithium, is reacted with 15 g of fluorine gas to form lithium fluoride. After the reaction is complete, how many moles of lithium fluoride are obtained?
a) 2.16 moles
b) 0.79 moles
c) 1.37 moles 
d) 0.039 moles

17) Which of the following is a neutralization reaction? 
a) CH4 + 2 O2 --> CO2 + 2 H2O
b) NaOH + HNO3 --> NaNO3 + HOH
c) Pb + O2 --> PbO2
d) Na2CO3 --> Na2O + CO2




19) Which species in the reaction below undergoes reduction? Sn(s) + 2 HCl(aq) => SnCl2(aq) + H2(g)
a. Sn
b. Hydrogen
c. SnCl2 
d. H2


20) What type of reaction is the following?
AgNO3 + BaCl2 => AgCl + Ba(NO3)2

1. Single displacement
2. Double displacement c. Synthesis
    d. Redox 
3.  
4.  
5. 
   
   
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