题目内容

Consider two aqueous solutions of nitrous acid (HNO2). Solution A has a concentration of [HNO2] = 0.55 M and solution B has a concentration of [HNO2] = 1.25 M. Which statement about the two solutions is true?

A. Solution A has the higher percent ionization and the higher pH
B. Solution B has the higher percent ionization and the higher pH
C. Solution A has the higher percent ionization and solution B has the higher pH
D. Solution B has the higher percent ionization and solution A has the higher pH

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Which change will cause a change in the equilibrium constant? SiF4(g) + 2H2O(g) ⇌ SiO2(s) + 4HF(g) ∆Ho = +148.9kJ

Adding more SiO2(s)
B. Increasing the temperature
C. Decreasing the pressure by increasing the volume
D. Removing water

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Which of the following can NOT reach the equilibrium shown by the equation CaCO3(s) ⇌ CaO(s) + CO2(g)

A. Pure CaCO3(s)
B. Pure CaO(s)
C. A mixture of CaCO3(s) and CaO(s)
D. CaO(s) and a concentration of CO2(g) greater than the equilibrium concentration

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For a given reaction, doubling the temperature will increase the reaction rate by ()

A. 2
B. 0.61
C. 2.7
D. 1.6

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The reaction C ® products is a first-order reaction with t1/2 = 1.3 ´ 104 s. If the initial concentration of C is 0.200 M, what will be the concentration of C after 2.6 ´ 104 s? ( )

A. 0.025 M
B. 0.050 M
C. 0.100 M
D. 0.200 M

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Consider two aqueous solutions of nitrous acid (HNO2). Solution A has a concentration of [HNO2] = 0.55 M and solution B has a concentration of [HNO2] = 1.25 M. Which statement about the two solutions is true?

A. Solution A has the higher percent ionization and the higher pH B. Solution B has the higher percent ionization and the higher pH C. Solution A has the higher percent ionization and solution B has the higher pH D. Solution B has the higher percent ionization and solution A has the higher pH

Which change will cause a change in the equilibrium constant? SiF4(g) + 2H2O(g) ⇌ SiO2(s) + 4HF(g) ∆Ho = +148.9kJ

Which of the following can NOT reach the equilibrium shown by the equation CaCO3(s) ⇌ CaO(s) + CO2(g)

For a given reaction, doubling the temperature will increase the reaction rate by ()

The reaction C ® products is a first-order reaction with t1/2 = 1.3 ´ 104 s. If the initial concentration of C is 0.200 M, what will be the concentration of C after 2.6 ´ 104 s? ( )

A. Solution A has the higher percent ionization and the higher pH
B. Solution B has the higher percent ionization and the higher pH
C. Solution A has the higher percent ionization and solution B has the higher pH
D. Solution B has the higher percent ionization and solution A has the higher pH