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
Energy cycle of the biosphere
Basic chemical structure and synthesis of catecholamines. The synthesis of norepinephrine occurs in ...
Proteolytic enzymes
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Structure and function of human teeth.
Energy flows from the environment into living organisms, then back to the environment