35) Osmotic pressure is the amount of pressure needed to prevent the process of

Question

35) Osmotic pressure is the amount of pressure needed to prevent the process of osmosis from occurring. a. TRUEb. FALSE 36) The osmolarity of a 3.0 M NaCl solution is greater than the osmolarity of a 2.0 M Na2SO4 solution. a. TRUE b. FALSE 37) The presence of two reactants is a requirement for all chemical reactions. a. TRUE b. FALSE 38) The reaction Mg + 2HCl MgCl2 + H2 is an example of a double-replacement reaction. a. TRUE b. FALSE 39) All of the following may shift the position of an equilibrium except one. The exception is a. concentration change b. addition of a catalyst c. pressure change d. temperature change 40) Oxidation and reduction are complementary processes that always occur together. a. TRUE b. FALSE 41) Increasing the concentration of a reactant makes collisions between that reactant and other reactants less likely because of "more crowded conditions." a. TRUE b. FALSE 42) In a redox reaction, both an oxidizing agent and a reducing agent must be present. a. TRUE b. FALSE 43) In reactions that involve solid reactants, the reaction rate increases as the degree of subdivision of the solid reactants increase. a. TRUE b. FALSE

Explanation / Answer

35)
this is correct statement
Answer: a

36)
osmolarity of NaCl = i*M
= 2*3.0
= 6.0
i=2 for NaCl as it dissociates into Na+ and Cl-

osmolarity of Na2SO4 = i*M
= 3*3.0
= 6.0
i=3 for Na2SO4 as it dissociates into 2 Na+ and 1 SO42-
So, they have equal osmolarity
Answer: b

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