1)When 2 grams of powdered lead (IV) oxide was added to 100 cm3 of hydrogen peroxide, water and oxygen were produced. Lead (IV) oxide was not used up in the reaction. Based on the information, which of the following is likely to decrease the rate of formation of the products?
Replacing the powdered lead oxide with its large crystals
Removing lead (IV) oxide from the reaction mixture
Using 50 cm3 of hydrogen peroxide
Using 1.0 gram of lead (IV) oxide
2)Why does the equilibrium of a system shift when the pressure is increased?
To maximize the stress on the system
To stop restoring equilibrium to the system
To increase the total moles of gas in the system
To decrease the total moles of gas in the system
3)Which statement is true about a reversible reaction?
The forward and reverse reactions stop.
The product is a salt and the reactant is an acid.
The products react to re-form the original reactants.
The forward reaction continues but reverse reaction stops.
4) What happens to the molarity of a salt solution if the number of moles of salt in the solution is multiplied by three and the number of liters of the solution is also multiplied by three?
The molarity of the solution remains unchanged.
The molarity of the solution becomes three times as much.
The molarity of the solution becomes six times as much.
The molarity of the solution decreases.
1) PbO2 + H2O2 → PbO + O2 + H2O Using 50 cm3 of hydrogen peroxide Because a... View the full answer