5. Environmental Chemistry

Chemical Fundamentals — Quiz

Test your understanding of chemical fundamentals with 5 practice questions.

Practice Questions

Question 1

For the Haber process reaction $\mathrm{N_2 + 3H_2 \rightarrow 2NH_3}$ at $298\ \mathrm K$, given $\Delta G^\circ_{298}=-33.0\ \mathrm{kJ\,mol^{-1}}$, what is the equilibrium constant $K_c$?

Question 2

Given rate constants $k_1=1.2\times10^{-3}\ \mathrm{s^{-1}}$ at $298\ \mathrm K$ and $k_2=4.8\times10^{-3}\ \mathrm{s^{-1}}$ at $308\ \mathrm K$, what is the activation energy $E_a$ (in kJ mol⁻¹)?

Question 3

In water treatment, Fe²⁺ is oxidized by permanganate: $2KMnO_4+10Fe^{2+}+8H_2O\rightarrow2MnO_2+10Fe(OH)_3+2K^++16H^+$. To oxidize Fe²⁺ at $10\ \mathrm{mg/L}$ in $500\ \mathrm{m^3}$ of water, how many kilograms of $KMnO_4$ are needed?

Question 4

Calculate the reaction enthalpy $\Delta H_{rxn}$ (in kJ) for $2NO(g)+O_2(g)\rightarrow2NO_2(g)$ given $\Delta H_f^\circ(NO)=90.3\ \mathrm{kJ/mol}$ and $\Delta H_f^\circ(NO_2)=33.1\ \mathrm{kJ/mol}$.

Question 5

In a coffee-cup calorimeter, mixing $0.100\ \mathrm{L}$ of $1.00\ \mathrm M$ HCl with $0.100\ \mathrm{L}$ of $1.00\ \mathrm M$ NaOH at $25\ ^\circ\mathrm C$ yields neutralization enthalpy $\Delta H_{neut}=-57.3\ \mathrm{kJ/mol}$. What is the temperature rise $\Delta T$ (°C)?