What is the function of enzymes? A) structure and support B) ...

[BRWH]

What is the function of enzymes?
 
  A) structure and support
  B) energy reserves
  C) biochemical catalysts
  D) communication between cells
  E) physical protection

Question 2

How many grams of H2 gas can be produced by the reaction of 54.0 grams of Al(s) with an excess of dilute hydrochloric acid in the reaction shown below? 2 Al(s) + 6 HCl(aq)  2 AlCl3(aq) + 3 H2(g)
 
  A) 2.68 g
  B) 4.04 g
  C) 6.05 g
  D) 12.1 g

Question 3

Based on the balanced chemical equation shown below, determine the mass percent of Fe3+ in a 0.7450 g sample of iron ore,
 
  if 22.40 mL of a 0.1000 M stannous chloride, SnCl2(aq), solution is required to completely react with the Fe3+ present in the ore sample. The chemical equation for the reaction is
 
   2 Fe3+(aq) + Sn2+(aq)  2 Fe2+(aq) + Sn4+(aq).
 
  A) 5.365
  B) 8.396
  C) 16.79
  D) 33.58

Question 4

What is the value of H3O+ in a solution with pH = 10.82?
 
  A) 6.6  10-4 M
  B) 1.5  10-11 M
  C) 1.03 M
  D) 10.82 M
  E) 3.18 M

Question 5

The number of valence electrons in an element with electron configuration 1s2 2s2 2p6 3s2 3p4 is ________.
 
  A) 2
  B) 4
  C) 6
  D) 8
  E) 16

[pratush dev]

Answer to Question 1

C

Answer to Question 2

C

Answer to Question 3

D

Answer to Question 4

B

Answer to Question 5

C

[BRWH]

TY

[pratush dev]

You're welcome