Unit 1
The number of significant figures in .00204 x 340
2
Ba3N2 + H2O → Ba(OH)2 + NH3
What are the coefficients of each molecule when the equation is balanced?
1, 6, 3, 2
The order of these bonds when arranged from most to least polar: H-F, H-O, H-Cl
What is H-F, H-O, H-Cl?
Polar or nonpolar: CH2Cl2
What is polar?
What is the molecular geometry of an atom with three atoms bonded to it and one lone pair?
trigonal planar
formula of zinc fluoride
What is ZnF2?
4 FeS + 7 O2 --> 2 Fe2O3 + 4 SO2
The limiting reagent if we start with 10.00 g FeS and 25.00 g O2
What is FeS?
The atom that will most easily lose its first valence electron: magnesium, calcium, oxygen
What is calcium?
What is the mass of a sample of nickel, which completely melts after 4560 J of heat? (∆Hfus of nickel is 298 J/g)
15.30 g
the hybridization of oxygen in water
what is sp3
Number of millimeters equal to .0095 kilometers
9500 mm
40.00% C, 6.72% H, 53.28% O; molar mass = 90.07794 g/mol
The molecular formula of the compound
C3H6O3
The atom with the least electron affinity out of these three: carbon, nitrogen, oxygen
What is nitrogen?
The specific heat of ethanol is 2.46 J/g*degrees C. Find the heat required to raise the temperature of 200 g of ethanol from 10 degrees C to 30 degrees C.
9,840 Joules
CaCl2 + Na3PO4 → Ca3(PO4)2 + NaCl
The coefficient of calcium chloride when this equation is balanced
3
name of S2O4
What is disulfur tetroxide?
5.93% H and 94.07% O; 34.014 g/mol
The molecular formula of the compound
H2O2
silicon disulfide lewis structure
check valence e- and octet rule
The work done (in Joules) on a gas that contracts from 7 L to 2 L when the pressure surrounding it is 3 atm.
1 L*atm = 101 Joules
1,515 J
The longer bond out of these two:
the carbon-oxygen bond in carbon monoxide
the carbon-oxygen bond in carbon dioxide
What is the carbon-oxygen bond in carbon dioxide?
The avg. atomic mass of naturally occurring copper, which is 69.1% copper-63 (which has a mass of 62.93 amu) and 30.9% copper-65 (which has a mass of 64.93 amu)
63.55 amu
The empirical formula of a compound containing 47.37% carbon, 10.59% hydrogen, and 42.04% oxygen.
What is C3H8O2?
The bond with the highest melting point out of these three: LiF, BeO, NaCl
What is BeO?
Zn(s) + 1/8S8(s) + 2O2(g) → ZnSO4(s)
Zn(s) + 1/8S8(s) → ZnS(s) ΔH = -183.92 kJ
2ZnS(s) + 3O2(g) → 2ZnO(s) + 2SO2(g) ΔH = -927.54 kJ
2SO2(g) + O2(g) → 2SO3(g) ΔH = -196.04 kJ
ZnO(s) + SO3(g) → ZnSO4 (s) ΔH = -230.32 kJ
Answer = -976.03 kJ
The names of the orbitals that are filled in a neon atom
What are 1s, 2s, and 2p?