CHS 1440 Test 2
A silicon atom has how many valence electrons? a. 14 b. 2 c. 4 d. 6 e. 10
4
How many carbon atoms are present in 214g of mannose, C6H12O6? a. 8.50x10^25 b. 1.33x10^21 c. 2.14x10^22 d. 7.17x10^23 e. 4.29x10^24
4.29x10^24 C atoms
Determine the volume of methanol (in L) needed to generate 10.0L of a 0.45M solution from a 1.0M solution of methanol. a. 4.5L b. 3.0L c. 1.5L d. 1.0L e. 6.0L
4.5 L
What type of orbital is designated n=4, l=2, m1=-2
4d
What is the maximum number of electrons in an atom that has quantum numbers of n=5?
6
According to the following balanced equation, how many moles of KOH are formed if 4mol of H2O react with 8mol KO? 4KO + 2H2O --> 4KOH + O2
8
The reaction shown has a theoretical yield of 45.8g. When the reaction is carried out, 37.2g of the product, CH4, is obtained. What is the percent yield? a. 55.1% b. 44.8% c. 123% d. 81.2% e. 94.6%
81.2%
Which of these electron transitions between energy levels corresponds to the shortest emitted wavelength? The subscripts represent n, the principle quantum number. a. E6 to E2 b. E5 to E2 c. E4 to E2 d. E3 to E2 e. E2 to E3
E6 to E2
The combustion of butane produces gaseous carbon dioxide and steam. 2C4H10 + 13)2 --> 8CO2 + 10h2O All of the following statements concerning this reaction are correct except... a. eight molecules of carbon dioxide are formed per two molecules of butane consumed. b. thirteen molecules of oxygen are consumed per two molecules of butane consumed. c. Five moles of steam are formed per six and a half moles of oxygen consumed. d. the combined mass of all reactants consumed equals the mass of all products formed. e. eight grams of carbon dioxide are formed when thirteen grams of oxygen react.
Eight grams of carbon dioxide are formed when thirteen grams of oxygen react.
What is the net ionic equation for the reaction between aqueous sodium hydroxide and aqueous hydrochloric acid?
H+ + OH- --> H2O
Select the compound below that is classified as a strong acid in aqueous solution. a. H3PO3 b. HBr c. CH3OH d. Ca(OH)2 e. KHSO4
HBr
What is the shape of a 2s orbital?
spherical
Select the wavelength of electromagnetic radiation that corresponds to the greatest frequency, v.
violet, 434nm
Combustion of C2H3Cl yields carbon dioxide, steam, and hydrogen chloride gas. If 55.00g of C2H3Clreact, how many moles of steam are formed? Molar mass C2H3Cl = 62.49g/mol 2C2H3Cl + 5O2 --> 4CO2 + 2H2O + 2HCl a. 4.001 mol b. 0.3251 mol c. 1.146 mol d. 0.8801 mol e. 0.6910 mol
0.08801 mol
Potassium iodide reacts with lead(II) nitrate in the following reaction: 2KI + Pb(NO3)2 --> 2KNO3 + PbI2 What is the volume of 0.200M potassium iodide solution required to react with 155.0 mL of a 0.112M lead(II) nitrate solution? a. 348mL b. 86.8 mL c. 174 mL d. 43.4 mL e. 121 mL
174 mL
Select the set arranged in decreasing first ionization energy. a. Cs > Mg > Ar b. Mg > Ar > Cs c. Ar > Mg > Cs d. Cs > Ar > Mg e. Mg > Cs > Ar
Ar > Mg > Cs
A compound is 52.14% C, 13.13% H, and 34.73% O by mass. What is the empirical formula of the compound? a. C2H8O3 b. C2H6O c. C4HO3 d. C3HO6 e. C5H5O2
C2H6O
Which of the following represent p-orbitals? a. I only b. II only c. III only d. IV only e. I and II
II only
Of the following, which atom has the largest atomic radium? a. O b. Ne c. Na d. F e. N
Na
Give the ground state electron configuration for As. a. [Ar] 4s2 3d10 4p3 b. [Ar] 4s2 4d10 4p3 c. [Ar] 4s2 3d10 4p6 d. [Ar] 4s2 3d10 e. [Ar] 3d10 4p5
[Ar] 4s2 3d10 4p3
All of the following sets of quantum numbers are allowed except a. n=6, l=0, m1=+1 b. n=5, l=4, m1=0 c. n=4, l=1, m1=-1 d. n=3, l=0, m1=+2 e. n=1, l=0, m1=0
n=6, l=0, m1=+1
