When you consider an unknown element 'Y' that ends at 6p2 | Complete Solution

Question 1 of 20
2.0 Points
When you consider an unknown element 'Y' that ends at 6p2. Which element is it?
 A.Cl    
 B.Al    
 C.Na    
 D.Pb    

Question 2 of 20
2.0 Points
Arrange the following elements from lowest to highest ionization energy: Be, Mg, Ca, Rb, Sr 
a. b. 
c. Rb, Sr, Ca, Mg, Be    d. 
 A.Be, Mg, Ca, Sr, Rb    
 B.Rb, Sr, Ca, Mg, Be    
 C.Be, Mg, Ca, Rb, Sr    
 D.Rb, Sr, Ca, Be, Mg    

Question 3 of 20
2.0 Points
We can use pH to find a solution's H+ and OH- concentrations. Which pH below represents the highest [OH-]?
 A.pH = 7.93    
 B.pH = 3.21    
 C.pH = 10.12    
 D.pH = 12.49    
 E.pH = 7.00    

Question 4 of 20
2.0 Points
When you consider lanthanides and actinides, they have these kinds of orbitals: 
 A.s only    
 B.f only    
 C.s, p, d, and f    
 D.s, p and d    

Question 5 of 20
2.0 Points
Suppose you had a sequence of ALA-VAL-ISO-LEU-MET-PHE this is an example of what?
 A.Secondary structure    
 B.Pental structure    
 C.Primary structure    
 D.Quaternary structure    
 E.Tertiary structure

Question 6 of 20
2.0 Points
Assume that all samples listed below have the same pressure and temperature. Which would have the greatest volume?
 A.1 gram of O2    
 B.all have the same volume    
 C.1 gram of Ar    
 D.1 gram of H2    
 E.not enough information

Question 7 of 20
2.0 Points
Deviations from the ideal gas law are greater at:
 A.low temperatures and high pressures.    
 B.high temperatures and low pressures.    
 C.low temperatures and low pressures.    
 D.high temperatures and high pressures.    

Question 8 of 20
3.0 Points
If 73.5 mL of 0.200 M KI(aq) was required to precipitate all of the lead (II) ion from an aqueous solution of lead (II) nitrate, how many moles of Pb2+ were originally in the solution?
 A.7.35 x 10-2 moles Pb2+    
 B.73.5 x 10-3 moles Pb2+    
 C.73.5 x 10-2 moles Pb2+    
 D.7.35 x 10-3 moles Pb2+    

Question 9 of 20
3.0 Points
Cells are biomolecular engines. Considering the groups of chemicals listed below, which are the main ones that make up the cell?
 A.none of the above    
 B.carbohydrates, alcohols, proteins and amines    
 C.alcohols, proteins, amines and nucleic acids    
 D.amines, lipids, nucleic acids and proteins    
 E.proteins, nucleic acids, lipids, and carbohydrates    

Question 10 of 20
2.0 Points
In the lab you isolated an element that is a gas at room temperature, so it must be a(n): 
 A.Alkaline Earth Metal    
 B.Halogen    
 C.Nonmetal    
 D.Alkali Metal    

Question 11 of 20
3.0 Points
Suppose we have an element 'X' and we know it has four energy levels, five valence electrons, and is a metalloid. What is this element X? 
a. Si    b. Ge 
c. Se    d. As 
 A.Se    
 B.Si    
 C.Ge    
 D.As    

Question 12 of 20
3.0 Points
Calculate the volume occupied by 35.2 g of methane gas (CH4) at 25°C and 1.0 atm. (R = 0.08206 L*atm/K*mol)
 A.4.5 L    
 B.0.0186 L    
 C.11.2 L    
 D.53.7 L    

Question 13 of 20
2.0 Points
What is the complementary DNA sequence to the one provided here: 

AGTTACTTC
 A.TCUUTGUUG    
 B.TCTTCCTTC    
 C.AGCTTCTTA    
 D.TCAATGAAG    

Question 14 of 20
3.0 Points
A 20.00 mL sample of 0.1015 M nitric acid is introduced into a flask, and water is added until the volume of the solution reaches 250.00 mL. What is the concentration of nitric acid in the final solution?
 A.8.12 x 10-3 M    
 B.3.25 x 10-2 M    
 C.0.406 M    
 D.1.27 M    

Question 15 of 20
2.0 Points
Which of these species is an aromatic compound?
 A.C2H2    
 B.C5H10    
 C.C6H12    
 D.C6H4Br2    

If you consider the second ionization energy of sodium, why is it higher than the first ionization energy? 

 A.The second electron is a valence electron    
 B.The second electron is removed from an already-stable noble gas core    
 C.The atom has a larger radius after the first electron is removed    
 D.It’s not higher than the first ionization energy

Question 17 of 20
3.0 Points
In every 100 g of water, I can dissolve 36 g of NaCl. So, which of these solutions would be unsaturated?
 A.3.25 moles of NaCL dissolved in 500 ml of water    
 B.5.8 moles of NaCl dissolved in 1 L of water    
 C.1.85 moles of NaCl dissolved in 300 ml of water    
 D.None of the above.

Identify the following as acidic or basic.

1) [H+] = 4.4 x 10-11 M

2) [H+] = 1 x 10-5 M

3) [OH-] = 2.2 x 10-7 M

4) pOH = 1.4

 A.1) basic 

2) basic 

3) basic 

4) basic    
 B.1) basic 

2) acidic 

3) basic 

4) basic    
 C.1) basic 

2) acidic 

3) basic 

4) acidic    
 D.1) basic 

2) acidic 

3) acidic 

4) basic    

Question 19 of 20
2.0 Points
A friend was curious of the number of structural isomers of C4H10. How many are there?
 A.6    
 B.4    
 C.8    
 D.2    

Question 20 of 20
2.0 Points
When you consider the following elements, Fe, K, P, and Cl, which do you think will have the greatest electron affinity? 
a. K    b. Fe 
c. Cl    d. P 
 A.Cl    
 B.K    
 C.Fe    
 D.P