Are the following Chemistry problems correct?

Question

For the equation CaCO₃ (s) + 2HCl (aq) → CaCl₂ (s) + H₂ (aq) + H₂O (l), 100.00 g of CaCO₃ pellets are combined with 250 mL of HCl of a 2.0 M solution. Which of the following will increase the rate of the chemical reaction?

A. Add heat to the reaction.

B. Increase the concentration of HCl to 3.0 M.

C. Crush the CaCO3 into powder.

D. All of the Above

E. None of the Above

A test within an experiment that is conducted under standard conditions is called a _______.

A. control

B. benchmark

C. standard reaction

D. All of the Above

E. None of the Above

Which term is the catalyst in the following reaction mechanism?

     H₂O₂ + I^– → H₂OH + IO^–

     H₂O₂ + IO^– → H₂O + O₂ + I^–

A. H2OH

B. IO–

C. H2O2

D. H2O

E. None of the Above

 

CH₃OH + KF → KOH + CH₃F is a first-order reaction for all of the reactants, with a rate constant of 0.0123 l/Ms. Find the instantaneous rate for this reaction if the initial concentration of CH₃OH is 0.59 M, and the initial concentration of KF is 1.22 M.

A. 0.56 1/Ms

B. 0.56 1/M2s

C. 0.0089 M/s

D. 0.0089 M2/s

E. None of the Above

 

The rate of a standard reaction is 0.00543 M/s at 40 ^oC. What will the rate be if the temperature is doubled?

A. 0.0109 M/s

B. 0.0217 M/s

C. 0.0434 M/s

D. 0.0869 M/s

E. All of the Above

Answer 1

I agree with all except the third question, and maybe the second question as well.

Q1: agree

Q2: vague question; could be A control, or C standard reaction; or even B benchmark. My first choice would be control

Q3: the catalyst would be I^- as it is used in one step and regenerated in another. IO^- would be an intermediate, not a catalyst. E none of the above

Q4: agree

Q5: agree