Chemistry

Which of the following is an acid?

A. KOH (Potassium hydroxide)

B. LiOH (Lithium hydroxide)

C. NH3 (Ammonia)

D. H2SO4 (Sulfuric acid)

Which of the following is a weak base?

A. KOH (potassium hydroxide)

B. LiOH (lithium hydroxide)

C. NH3 (ammonia)

D. NaOH (sodium hydroxide)

An electrochemical cell, reaction shown below, has an $E^{\circ}$ value of +0.89 V.

$4 V^{3+}(aq)+2 H_2 O(\ell)+O_2(g) \leftrightharpoons 4 VO^{2+}(aq)+4 H^{+}(aq)$



What is the standard reduction potential for the half-equation below?

$VO^{2+}+2 H^{+}+e^{-} \leftrightharpoons V^{3+}+H_2 O$

(a) -0.34 V

(b) +1.57 V

(c) +0.34 V

(d) -1.57 V

Identify the oxidant in the following equation:



$2 BrO_3^{-}(aq)+10 I^{-}(aq)+12 H^{+}(aq) \rightarrow Br_2(aq)+5 I_2(aq)+6 H_2 O(\ell)$



A. $BrO _3^{-}( aq )$

B. $F ( aq )$

C. $H ^{+}( aq )$

D. $Br _2( aq )$

What is [tex]$K_{\text {eq }}$[/tex] for the reaction [tex]$N 2+3 H _2 \rightleftharpoons 2 NH _3$[/tex] if the equilibrium concentrations are [tex]$\left[ NH _3\right]=3 M ,\left[ N _2\right]=1 M$[/tex], and [tex]$\left[ H _2\right]=2 M$[/tex]?

A. [tex]$K{ eq }=4.5$[/tex]

B. [tex]$K_{\text {eq }}=1.125$[/tex]

C. [tex]$K_{ eq }=0.75$[/tex]

D. [tex]$K_{e q}=1.5$[/tex]

What would happen if [tex]$N 2$[/tex] were added to [tex]$N _2(g)+ O _2(g) \rightleftharpoons 2 NO (g)$[/tex] at equilibrium?

A. [tex]$K{ eq }$[/tex] would decrease.

B. More [tex]$N _2$[/tex] and [tex]$O _2$[/tex] would form.

C. More NO would form.

D. More [tex]$O _2$[/tex] and NO would form.

Which statement accurately describes the chemical symbol of an element?

A. The chemical symbol is always a single letter.

B. The chemical symbol always starts with the same letter as the name of the element.

C. The chemical symbol always begins with a capital letter.

D. The chemical symbol can be shared by more than one element.

What is the equilibrium constant for the reaction $N 2(g)+ O _2(g) \rightleftharpoons 2 NO (g)$ ?

A. $K{e q}=\frac{2[ NO ]}{\left[ N 2\right]\left[ O _2\right]}$

B. $K{\text {eq }}=\frac{[ NO ]^2}{\left[N_2\right]\left[ O 2\right]}$

C. $K{e q}=\frac{[ NO ]}{\left[ N 2\right]\left[ O _2\right]}$

D. $K{e q}=\frac{2[ NO ]}{\left[ N _2\right]^2\left[ O _2\right]^2}$

What will be the action of the following substances on litmus paper, phenolphthalein, and methyl orange?



Dry HCl gas

Moistened NH3 gas

Lemon juice

Carbonated soft drink

Curd

Soap solution

Turmeric

What will be the action of the following substances on litmus paper, phenolphthalein, and methyl orange?

a) Dry HCl gas

b) Moistened NH3 gas

c) Lemon juice

d) Carbonated soft drink

e) Curd

f) Soap solution

g) Turmeric



4. Compounds such as alcohol and glucose also contain hydrogen like...

Which sequence represents the relationship between temperature and volume as explained by the kinetic-molecular theory?



A. higher temperature -> more kinetic energy -> more space between particles -> higher volume

B. higher temperature -> less kinetic energy -> less space between particles -> higher volume

C. higher temperature -> more kinetic energy -> less space between particles -> lower volume

D. higher temperature -> less kinetic energy -> more space between particles -> lower volume

Which two conditions can limit the usefulness of the kinetic-molecular theory in describing gas behavior?

A. high pressure and low temperatures

B. high pressure and medium temperatures

C. low pressure and low temperatures

D. low pressure and medium temperatures

Select the correct answer.

In the reaction [tex]Mg ( s )+2 HCl ( aq ) \rightarrow H _2(g)+ MgCl _2( aq )[/tex], how many grams of hydrogen gas will be produced from 125.0 milliliters of a 6.0 M HCl in an excess of Mg?

A. 0.75 grams

B. 1.5 grams

C. 0.38 grams

D. [tex]2.0[/tex] grams

E. 6.0 grams

Balance the following chemical equation by filling in the coefficients.



[tex]$\square C_2 H_6+\square O_2 \rightarrow \square CO_2+\square H_2 O$[/tex]

Using the phase diagram for CO2, what phase is carbon dioxide in at -60°C and 1 atm pressure?

A. At the melting point

B. Liquid

C. Solid

D. Gas

Which equilibrium describes a reversible reaction a short time after starting the reaction with reactants only?

A. [tex]$N {2(g)}+3 H {2(g)} \rightleftarrows 2 NH {3(g)}$[/tex]

B. [tex]$N {2(g)}+3 H {2(g)} \rightarrow 2 NH {3(g)}$[/tex]

c. [tex]$N {2(g)}+3 H {2(g)} \leftarrow 2 NH {3(g)}$[/tex]

D. [tex]$N {2(g)}+3 H {2(g)} \leftrightarrows 2 NH {3(g)}$[/tex]

E. [tex]$N {2(g)}+3 H {2(g)} \rightleftarrows 2 NH _{3(g)}$[/tex]

Consider this reaction:



[tex]$N_{2(g)}+O_{2(g)} \rightleftharpoons 2 NO_{(g)}$[/tex]



What will happen if pressure is increased on the system?

A. There will be a shift toward the products.

B. There will be a shift toward the reactants.

C. There will not be a shift.

D. [tex]$K_{e q}$[/tex] will increase.

E. [tex]$K_{e q}$[/tex] will decrease.

Why is a chemical equilibrium described as dynamic?

A. Because maximum randomness has been achieved.

B. Because the pressure and temperature do not change.

C. Because both reactants and products continue to form.

D. Because the concentrations of chemical species remain constant.

E. Because the reactant and product molecules are in constant motion.

Select the correct answer.

Which reaction occurs most rapidly at standard conditions?

A. [tex]$H {2(g)}+ I {2(s)} \rightarrow 2 HI {( g )}$[/tex]

B. [tex]$Cu {( s )}+ S {( s )} \rightarrow CuS {( s )}$[/tex]

C. [tex]$C 6 H {12} O {6(s)}+6 O {2(g)} \rightarrow 6 CO {2(g)}+6 H _2 O {( g )}$[/tex]

D. [tex]$SC 2 O _4^{2-}( aq )+2 MnO _4^{-}+16 H {( aq )}^{+} \rightarrow 10 CO {2(g)}+2 Mn _2^{+}( aq )+2 H _2 O {(1)}$[/tex]

E. [tex]$Ag ^{+}{ }{( aq )}+^{-} \rightarrow AgI {2(s)}$[/tex]

Using the phase diagram for H2O, which of the following correctly describes water at 0°C and 1 atm?

A. At the boiling point

B. Liquid

C. At the melting point

D. Gas

Which of the following ions binds to the troponin complex . Initiating muscle contraction

Why is water considered to be neutral?

A. Its $\left[ H ^{+}\right]$and $\left[ OH ^{-}\right]$are the same.

B. It has only $\left[ OH ^{-}\right]$in solution.

C. It has only $\left[ H ^{+}\right]$in solution.

D. Its $pH + pOH =14$.