Exam 1
How many milligrams are in one gram?
103
What is the oxidation number of lead in PbO2
+4
When filled, how many electrons can the f subshell hold?
14
An element is what row (and below) can have an expanded octet?
Row 3
What is the most abundant element in the universe?
Hydrogen
If the mass of a cup is 45.39 g and the mass of sugar and the cup is 320.8673 g the mass of the sugar is
275.48 g
What is the theoretical yield of water if 26.0 g of O2 are reacted?
29.25 g of H2O
If 1 mol of gas at STP is 22.4 L what will happen to the volume if the temperature is changed to 20 C
The volume will increase
What is the steric number of ICl3
5
What is Avogadro's number?
6.023 x 1023
An atom of I-1 has how many protons
53
If 500.0 mL of 1 M HCl is diluted to 1.5 L what is the final molar concentration?
0.33 M
If 2L of H2 gas is formed how much Na was reacted?
2Na+2H2O --> 2NaOH+H2
4.1 g
What is the molecular geometry of NH3
Trigonal pyramidal
Dry ice is the solid form of what compound?
CO2
Determine the number of moles of oxygen (O) in 235 mg of Al2(CO3)3
0.00904 mol of O
What compound is oxidized in this reaction?
2HBr + Cl2 --> 2HCl + Br2
Br
What is the wavelength of a photon emitted when an electron fall from level 4 to 2 in a hydrogen atom?
486 nm
What is the formal charge of SF5-
-1
What color is liquid oxygen
Blue
If percent composition is C-68.3%, H-6.3%, N-3.8%, O-21.6% what is the empirical formula?
C21H23NO5
If 30.0 mL of NaOH is required to titrate 50.0 mL of 0.25 M HCl what is the molarity of NaOH?
0.42 M
What is the electron configuration of Ca2+
1s2 2s2 2p6 3s2 3p6
Is HSO3- a polar molecule?
Yes
What are the two metals that lack a silvery appearance
Gold and copper