Energy
What formula can be used to calculate energy from frequency?
E=hv
h= planck's constant
Type of reaction where energy is released
Exothermic reaction
Soluble or insoluble
PbCl2
Insoluble
Noble gas configuration for Mg
[Ne] 3s2
Identify the answer using the correct number of sig figs in
(.792 x 1.459) + (8.3/2.14)
5.0
What is the wavelength if the frequency is 60,000hz?
5000m
If the heat change of a reaction is 234 J is it endothermic or exothermic
Endothermic
Determine the products, which is solid?
Na2SO4 (aq) + CaI2 (aq) →
CaSO4 (s) + 2 NaI (aq)
Noble gas configuration for Cr-2
[Ar] 4s2 3d6
Which of the following is an acid?
a. NaCl
b. Ni(OH)2
c. CaSO4
d. HNO3
d. HNO3
Calculate the wavelength of light that must be absorbed by a hydrogen atom to promote an electron from the n = 3 to the n = 5 energy level.
RH= 2.179x10-18
1.29 x 10-6 m
Find ΔH
2 H2S (g) + 3 O2 (g) → 2 H2O (g) + 2 SO2 (g)
ΔHf°[SO2(g)] = -292.1 kJ/mol,
ΔHf°[H2S(g)] = -26.15 kJ/mol,
ΔHf°[H2O(l)] = -275.8 kJ/mol,
ΔHf°[H2O(g)] = -221.8 kJ/mol,
ΔHf°[O3(aq)] = -32.09 kJ/mol.
-974.5 kJ
Finish the reaction and find the net ionic equation
AgNO3 (aq) + K2S (aq) -->
2 Ag+ (aq) + S-2 (aq) --> Ag2S (s)
Noble gas configuration for Pt+2
[Xe] 6s2 4f14 5d6
How many mL would be needed to make a 1.4M solution out of 3.0L of a .350M soultion?
750 mL