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What is the coefficient of Al2O3 when the following equation is balanced?
Al2O3 (s) + C (s) + Cl2 (g) ------> AlCl3 (s) + CO (g) |
A) 1
B) 2 C) 3 D) 4 E) 5 |
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What is the coefficient of Ca when the following equation is completed and balanced? Calcium reacts with water to form calcium hydroxide and element hydrogen. .
Ca (s) + H2O (l) ------> Ca(OH) + H2 (g) |
A) 1
B) 2 C) 3 D) 4 E) 8 |
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Which of the following are combination reactions?
1) CH4 (g) + O2 (g) --------> CO2 (g) + H2O (l) 2) CaO (s) + CO2 (g) -------> CaCO3 (s) 3) Mg (s) + O2 (g) -------> MgO (s) 4) PbCO3 (s) --------> PbO (s) + CO2 (g) |
A) 1, 2, and 3
B) 2 and 3 C) 1,2,3, and 4 D) 4 only E) 2, 3, and 4 |
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The formula weight (amu) of potassium dichromate, K2Cr2O7 is __________.
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A) 107.09
B) 255.08 C) 242.18 D) 294.18 E) 333.08 |
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What mass (g) of oxygen is required to burn 28.8 g of ammonia? Be sure to balance the reaction.
Mg3N2 + H2O -----> NH3 + MgO |
A) 94.9
B) 54.1 C) 108 D) 15.3 E) 28.8 |
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If the reaction of 3.82 g of magnesiium nitride with 7.73 g of water produced of 3.60 g of magnesium oxide, what is the percent yiled of this reaction? Balance the reaction
Mg3N2 + H2O ------> NH3 + MgO
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A) 94.5
B) 78.8
C) 46.6
D) 49.4
E) 99.9
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Calcium hyrdoxide react with sodium phosphate to produce calcium phosphate and ssodium hydroxide via the equation:
3Ca(OH)2 (aq) + 2Na3PO4 (aq) -----> Ca3(PO4)2 (aq) + 6NaOH (aq)
How many grams of calcium phosphate can be produced by the combination of 75.00 g Ca(OH)2 and 150.00 g Na3PO4?
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A) 471.0
B) 75.00
C) 104.7
D)225.0
E) 141.9
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Of the compounds below, only ______ is not an elctrolyte.
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A) HCl
B) Rb2SO4
C) Ar
D) KOH
E) NaCl
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A weak elctrolyte exists predominatly as _____ in solution.
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A) atoms
B) ions
C) Molecules
D) Electrons
E) an isotope
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What are the spectator ions in the reaction between KOH(aq) and HNO3 (aq)?
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A) K+ and H+
B) H+ and OH -
C) K+ and NO-3
D) H+ and NO-3
E) OH- only
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Which on of the following is a weak acid?
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A) HNO3
B) HCl
C) Hi
D) HF
E HClO4
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When H2SO4 is neutralized by KOH in aqueous solution, the net ionic equation is________.
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A) SO4-2 (aq) + 2K= (aq) -----> K2SO4 (aq)
B) SO4-2 (aq) + 2K+--------> K2SO4 (s)
C) H+ (aq) + OH-(aq) ------> H2O (l)
D) H2SO4 (aq) + 2OH- -----> 2H2O (l) + SO4-2 (aq)
E) 2H+ 9(aq) + 2KOH (aq) -------> 2H2O (l) + 2K+ (aq)
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Which hydroxides are weak bases?
1 Sr(OH)2
2. KOH
3 NaOH
4Ba(OH)2
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A) 2& 4
B) 1,2,3, & 4
C) 2 & 3
D) 2,3, & 4
E) none of these is a weak base
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Based on the equations below, which metal is the most active?
Pb(NO3)2 (aq) + Ni (s) ------> Ni(NO2)2 (aq) + Pb (s) Pb(NO3)2 (aq) + Ag (s) --------> No Reaction Cu(NO3)2 (aq) + Ag (s) ---------> No Reaction |
A) Ni
B) Ag C) Cu D) Pb E) N |
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Which of the following is an oxidation-reductions reaction?
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A) Cu (s) + 2AgNO3 -----> 2Ag(s) + Cu(NO3)2 (aq)
B) HCl (aq) + NaOH (aq) ------> H2O (l) + NaCl (aq) C) AgNO3 (aq) + HCl (aq) -------> AgCl(s) + HNO3 (aq) D) Ba(C2H3O2)2 (aq) + Na2SO4 (aq) --------> BaSO4 (s) + 2NaC2H3O2 (aq) E) H2CO3 (aq) + Ca(NO3)2 (aq) -------> 2HNO3 (aq) + CaCO3 (s) |
