Miscellaneous (Unit 1 and 2)
What is group 17?
Halogens
What is the mass percent of oxygen in Fe2(SO4)3?
58.5%
What is the molarity of 98.0 g of H3PO4 in 1.00 L of solution?
1.00 M
Which compound will react with aqueous potassium carbonate to form a precipitate? Iron(III) chloride, ammonium acetate or lithium phosphate?
iron(III) chloride
Is Group 1A soluble?
Yes, group 1A (Li+, Na+, K+, Rb+, Cs+) is soluble, no exceptions.
Groups 3-12
What are transition metals?
How many hydrogen atoms are in 2.50 g of pharmacolite, CaHAsO4*2H2O (Molar mass= 216.0)?
3.48 x 1022
2.50 g of carbon dioxide contains ___ oxygen atoms.
6.80x1023
What are the smallest whole number coefficients for each substance in the chemical reaction when balanced?
NaBr + Cl2 ---> NaCl + Br2
2, 1, 2, 1
Which of the following salts are insoluble?
a) LiCl
b) NaCl
c) AgCl
d) KCl
c) AgCl
ion with a 3+ charge, 28 electrons and a mass number of 71
What is Ga3+
1.00 g of hydrated potassium carbonate, K2CO3*nH2O, is heated to 250 C to give 0.836 g anhydrous K2CO3. What is the value of n?
1.5
(0.164 g H2O) * (1 mol H2O/18.0 g H2O) = 0.0091 mol H2O
(0.836 g K2CO3) * (1 mol K2CO3/138 g K2CO3) = 0.0060 mol K2CO3
Divide both sides by 0.0060.
Determine the number of atoms and the mass of zirconium, silicon, and oxygen found in 0.3384 mol of zircon, ZrSiO4.
zirconium: 2.03x1023 atoms; 30.87 g
silicon: 2.038x1023 atoms; 9.504 g
oxygen: 8.151x1023 atoms; 21.66 g
Balance:
Cu(s)+HNO3(aq)⟶Cu(NO3)2(aq)+H2O(l)+NO(g)
3Cu(s)+8HNO3(aq)⟶3Cu(NO3)2(aq)+4H2O(l)+2NO(g)
Which compound is soluble: potassium sulfate or barium sulfate.
potassium sulfate
Bromine has two naturally occurring isotopes. The moist abundant isotope (50.69%) is 79/35Br of mass 78.9183 amu. What is the other isotope?
81/35 Br
What is the empirical formula of a compound of carbon, hydrogen, and oxygen that contains 51.56% carbon and 14.09% hydrogen by mass?
C4H13O2
What is the molarity of 1.49 kg of C3H7OH, in 2.50 L of solution?
9.92 M
Balance: NH4NO3 ---> N2 + O2 + H2O
2NH4NO3 ---> 2N2 + O2 + 4H2O
Is sulfuric acid soluble?
Yes, H2SO4 is a strong acid
Which is not named correctly?
a) MnO4 Manganese(II) oxide
b) CuSO4 copper(II) sulfate
c) Na3PO4 sodium phosphate
d0 CaF2 calcium fluoride
A is incorrect. (MnO4)
An organic compound contains only carbon, hydrogen, nitrogen, and oxygen. It is 61.71% C, 4.03% H, and 16.00% N by mass. What is its empirical formula?
C9H7N2O2
What is the concentration of a H3PO4 solution that results when 2.35 L of a 0.350 M solution is diluted to a final volume of 4.00 L?
0.206 M
Write a balanced chemical equation for the combustion of ethan gas, C2H6
2C2H6(g) + 7O2(g) ---> 4CO2(g) + 6H2O(l)
What is/are the spectator ion(s) in this reaction?
HC2H2O2 + NaOH ---> NaC2H2O2 + H2O
Na+ and C2H3O2-