Chemical Reaction - Post Test
Balance: KClO3 --> KCl + O2
2KClO3 --> 2KCl + 3O2
Which chemical symbols will complete the equation for this single displacement reaction?2NaBr + Cl2
2NACl + Br^2
Which substance in this redox reaction is the oxidizing agent? Cu + 2AgNO3 → 2Ag + Cu(NO3)2
AgNO3
How would adding the catalyst nitrogen monoxide (NO) affect this reaction? 2SO2(g) + O2(g) → 2SO3(g)
NO increases the rate at which SO3 molecules are formed.
Which equations represent precipitation reactions?
Na2S + FeBr2 → 2NaBr + FeS MgSO4 + CaCl2 → MgCl2 + CaSO4 AgNO3 + NaCl → AgCl + NaNO3
A reversible reaction is a reaction that takes place in the backward directionforward directionforward and backward directions. If the reaction were to go to completionreach equilibriumlose its activation energy, the rate of the forward reaction would equal that of the reverse reaction.
A reversible reaction is a reaction that takes place in the (forward and backward directions). If the reaction were to go to (equilibrium) , the rate of the forward reaction would equal that of the reverse reaction.
Identify the type of reaction represented by each equation. A: H2 + Cl2 → 2HCl B: CH4 + 2O2 → CO2 + 2H2O
A: synthesis B: combustion
Use the solubility rules and the periodic table to predict the product that will precipitate out in the reaction. K2SO4(aq) + Ba(NO3)2(aq) → ?
BaSO4
How does the equilibrium change to counter the removal of A in this reaction? A + B ⇌ AB
Equib - shifts left Increase - reverse reaction
How can we increase the rate of collisions between the reactants in this reaction? Mg + 2HCl → MgCl2 + H2
Increase the concentration of Mg in the reaction mixture.
In this reaction, how does the rate of forward reaction vary with the concentration of the product? 2H2S(g) ⇌ 2H2(g) + S2(g)
It increases with a decrease in the concentration of H2(g). It decreases with an increase in the concentration of S2(g).
Which element or compound has lost electrons in this oxidation-reduction reaction? 4Li + 2CoO → 2Co + 2Li2O
Li
A substance is followed by the symbol (l) in a chemical equation. What does the symbol represent?
The substance is in the liquid state.
This chemical equation is not balanced:AgBr(s) → Ag(s) + Br2(g). Why isn't it possible for the reaction to occur as indicated by the unbalanced equation?
There is more mass represented on the right side of the equation than on the left side.
What would cause the equilibrium to shift left in this reaction? CO + 3H2 ⇌ CH4 + H2O
adding heat to the product mixture
Which substance is most likely to form in a precipitation reaction?
iron(II) sulfide
Based on the reactivities of the elements involved, which reaction will form products that are more stable than the reactants?
CaBr2 + 2Na → 2NaBr + Ca
The half reaction of an oxidation-reduction reaction shows that iron gains electrons. What does this electron gain mean for iron?
It is reduced.
