Topic
Q:
Based on your worksheet results, please match the following:
The electron group geometry of CCl 4 is
The electron group geometry of CHCl 3 is
[Choose ]
[Choose ]
The electron group geometry of \( \mathrm{SO}_{3} \) is
[Choose ]
[Choose ] electron group geometry of H 2 O is
[Choose ]
Q:
\[ \mathrm{Fe}_{2} \mathrm{O}_{3}(\mathrm{~s})+2 \mathrm{Al}(\mathrm{s}) \rightleftharpoons \mathrm{Al}_{2} \mathrm{O}_{3}(\mathrm{~s})+2 \mathrm{Fe}(\mathrm{s}) \]
View Available Hint(s)
The equilibrium will shift toward the reactants.
The equilibrium will shift toward the products.
The reaction will not shift toward either the products or reactants.
The reaction will shift toward both the reactants and products.
Q:
If an endothermic reaction is at equilibrium, how will the equilibrium shift when heat is added to the reaction?
View Available Hint(s)
The reaction will shift toward the reactants.
The reaction will shift toward the products.
The reaction will not shift toward products or reactants.
The reaction will shift toward both reactants and products.
Q:
Which of the following represent a buffer system?
Check all that apply.
\( \square \mathrm{NaOH} \) and NaCl
\( \square \mathrm{H}_{2} \mathrm{CO}_{3} \) and \( \mathrm{NaHCO}_{3} \)
HF and KF
KCl and NaCl
Q:
The pH scale for acidity is defined by
\[ \mathrm{pH}=-\log \left[\mathrm{H}^{+}\right] \]
where \( \left[\mathrm{H}^{+}\right] \)is the concentration of hydrogen ions measured in moles per liter (M).
a) A sample of rhubarb is found to have a hydrogen concentration of 0.000501 M . What is the pH? Round
your answer to 2 decimal places.
\( \mathrm{pH}=\square \)
b) The pH of a sample of red onion is 5.40 . What is the hydrogen concentration? Keep at leost 2 non-zero
decimal ploces.
\( \left[\mathrm{H}^{*}\right]=\square \)
Q:
TRY IT FIRST
A vinegar solution has a \( \left[\mathrm{OH}^{-}\right]=5.0 \times 10^{-12} \mathrm{M} \) at \( 25^{\circ} \mathrm{C} \). What is the \( \left[\mathrm{H}_{3} \mathrm{O}^{+}\right] \)of the vinegar
solution? Is the solution acidic, basic, or neutral?
Q:
32 Antara gas berikut, yang manakah mengandungi 1.2 mol atom pada keadaan
bilik?
[ 1 mol gas menempati \( 24 \mathrm{dm}^{3} \) pada keadan bilik]
Which of the following gases contains 1.2 mol of atoms at room conditions?
[1 mol of gas occupies \( 24 \mathrm{dm}^{3} \) at room conditions]
A \( 14.4 \mathrm{dm}^{3} \) gas karbon dioksida
B \( 14.4 \mathrm{dm}^{3} \) carbon dioxide gas
B \( 14.4 \mathrm{dm}^{3} \) gas nitrogen
C \( 14.4 \mathrm{dm}^{3} \) nitrogengas
\( 14.4 \mathrm{dm}^{3} \) gas metana
\( 14.4 \mathrm{dm}^{3} \) methane gas
D \( 14.4 \mathrm{dm}^{3} \) gas argon
\( 14.4 \mathrm{dm}^{3} \) argongas
Q:
The half-life of Palladium-100 is 4 days. After 16 days a sample of Palladium- 100 has been reduced to a
mass of 6 mg .
What was the initial mass (in mg ) of the sample?
What is the mass (in mg ) 6 weeks after the start?
You may enter the exact value or round to 4 decimal places.
Q:
The half-life of Palladium-100 is 4 days. After 24 days a sample of Palladium- 100 has been reduced to a
mass of 3 mg .
What was the initial mass (in mg ) of the sample?
What is the mass (in mg ) 7 weeks after the start?
You may enter the exact value or round to 4 decimal places.
Q:
The half-life of Radium- 226 is 1590 years. If a sample contains 500 mg , how many mg will remain after
3000 years?
Give your answer accurate to at least 2 decimal places.
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