Equilibrium
Which of the following will decrease the rate of reaction? 2 O2 + H2 --> 2 H2O
a. adding a catalyst
b. adding more H2
c. decreasing temperature
d. adding more water
C.
Which of the following are molecular substances?
a. PCl3
b. CaCl2
c. NOBr
d. Li2S
a and c
Is [H3O+] = 5 x 10-12 M acidic, basic or neutral?
basic
What is the molecular shape, geometry, and bond angle of CH4?
Shape: tetrahedral
Geometry: tetrahedral
Angle: 109
What is the volume occupied by 3.89 moles of He at STP conditions?
87.1 L He
Balance the following equation...
Cr + O2 --> Cr2O3
4 Cr + 3 O2 --> 2 Cr2O3
Which of the following would form a precipitate in water with carbonate (CO32-) but not with sulfate (SO42-)?
a. NH4+
b. Sr2+
c. Cu2+
d. Ba2+
C.
What is the pH of a solution that has a [H3O+] of 2.0 x 10-3? Is the solution acidic, basic or neutral?
2.7
acidic
What element is 1s22s22p63s23p5 and how many valance electrons does it have?
Chlorine
7 ve
What is the volume in mL of a 9.50 M KCL solution that contains 248 g KCl?
350. mL KCl
Molar mass: 74.551
What is the Kc value if O2 is 2.2 M, H2 is 5.4 M, and H2O is 1.7 M? Does it favor products or reactants?
2 O2 + H2 --> 2 H2O
Kc = 0.11
reactants
Which of the following will form a solution?
a. CaBr2 and CCl4
b. C8H8 and H2O
c. NaCl and Br2
d. Na2SO4 and H2O
d. polar and polar- like dissolves like
Name 3 strong acids and 3 strong bases.
HCl, HNO3, HBr, HCl4, HI, H2SO4
LiOH, Ca(OH)2, NaOH, CsOH, KOH, Ba(OH)2, RbOH
What is the name of
F4Cl6
Cl2O7
SO3
Tetrafluorine hexachloride
Dichlorine heptoxide
Sulfite
A gas is heated from 19.00 oC to 80.00 oC. If the initial pressure was 2000. Pa, what is the pressure after it is heated?
2,418 Pa
Which of the following will shift the reaction towards the products? 2 O2 + H2 --> 2 H2O heat= -45 kJ
a. adding more H2O
b. increasing heat
c. remove H2
d. decrease volume
e. increasing volume
D.
Write out the net ionic equation for
MnCl2 + 2 KOH --> Mn(OH)2 (s) + 2 KCl
Mn2+ + 2 OH- --> Mn(OH)2 (s)
What type of acid reaction is this? Bonus: name the acid used.
Mg + H2SO4 --> MgSO4 + H2
An acid metal reaction
sulfuric acid
Is CO2 a polar or nonpolar molecule? And name all the intermolecular forces.
nonpolar
dispersion
Candle wax has a density of .08 g/mL, a melting point of 135o C, and a heat of fusion of 215 J per gram of wax if a solid block of wax at 135o C has 55 kJ of heat added to it how many milliliters of wax melted?
3,100 mL
The Kc at 545 oC is 0.17. What is the equilibrium concentration of Rb3P in molarity, if the equilibrium concentration of [Rb] is 1.8 M and [P] is 2.6 M?
3 Rb + P → Rb3P
2.6 M
Which of the following will produce the largest number of ions/molecules when dissolved in water?
a. Ca(NO3)2
b. MgS
c. Ag3PO4
d. Al3NH4
D. 4 molecules
Classify and write a balanced equation.
NaHCO3 + H2SO4 →
2 NaHCO3 + H2SO4 → Na2SO4 + 2 CO2 + 2 H2O
carbonate
How many lone pairs are located around the central atom in the molecule SeCl2?
2 lone pairs
The stomach contains 67.5 g of hydrochloric acid (HCl). How many atoms of HCl are in the stomach?
1.11 x 1024 atoms of HCl
avagadros #: 6.02 x 1023
molar mass: 36.46 g