18 Questions
What is the primary reason 11C is unstable and radioactive?
Its n/p ratio is too low
What is a characteristic of a second-order reaction?
The half-life is independent of the initial concentration
What is the pH of neutral water at 25°C?
7.0
What type of emission would lead to stability in 11C?
Positron emission
What is the effect of increasing temperature on the rate of a second-order reaction?
The rate increases
What is the result of an n/p ratio that is too high?
Alpha emission
What is the nature of the autodissociation of water and how does the dissociation constant Kw change with increasing temperature?
endothermic, increasing
What is the role of Al3+ ions in a 0.1 M solution of AlCl3 with a pH of 5.5?
Lewis Acid; Bronsted Acid
What is emitted during the chain reaction in a nuclear power plant?
neutrons
What is the relationship between bond making and energy?
releases
What is true about a reaction at equilibrium with a very large Keq?
the forward rate constant equals the reverse rate constant
Which of the following is a redox reaction?
Nuclear fission of uranium-235
What is the type of bonding in AgCl?
Ionic
What is the effect of adding a small amount of HCl to an aqueous solution containing hydrogen fluoride and fluoride ions?
The concentration of hydrogen fluoride will decrease, and the concentration of fluoride ions will increase.
What is the effect of a catalyst on a chemical reaction?
It decreases the activation energy of the forward reaction only.
What is the significance of ∆Hfo?
It is the standard enthalpy change for a reaction.
Why is isotopic enrichment of uranium necessary for use in nuclear power reactors and nuclear weapons?
To achieve a critical mass for a sustained nuclear reaction.
What type of reaction is represented by the equation Pb2+ (aq) + 2Cl- (aq) → PbCl2 (s)?
Precipitation reaction
Test your understanding of acid-base chemistry with these questions on autodissociation of water and ions in solution. Answer questions about Kw, pH, and Lewis and Bronsted acids.
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