SI Final Review

Front

For an endothermic reaction, increasing temperature shifts the reaction towards ________ and the value of the equilibrium constant ________

Back

products; increase

Front

When Q < K for a chemical reaction, what happens?

Back

The forward reaction will proceed to form more products.

Front

Calculate the total pressure for a mixture of 56.0g N2 and 96.0g O2 in a 2.0L container at 300K.

Back

61.5 atm

Front

What is the freezing point depression when 62.2 g of toluene is dissolved in 481 g of naphthalene? The freezing point constant for naphthalene is 7.00 °C/m.

Back

9.82 °C

Front

Given the reaction 2 NOBr (g) ⇌ 2 NO (g) + Br2 (g) with Kc = 3.07 x 10^-4 at 24 °C, if [NOBr] = 0.0720 M, [NO] = 0.0162 M, [Br2] = 0.0123 M, what is Q and the direction of the reaction?

Back

Q = 6.23 x 10^-4; Q > K, toward reactants.

Front

Define equilibrium constant (K) in a chemical reaction.

Back

The equilibrium constant (K) is a ratio of the concentrations of products to reactants at equilibrium, each raised to the power of their coefficients.

Front

What is the effect of increasing temperature on an exothermic reaction?

Back

It shifts the reaction toward reactants and decreases the equilibrium constant.

Front

Explain the concept of Le Chatelier's Principle.

Back

Le Chatelier's Principle states that if a system at equilibrium is disturbed, the system will shift in a direction that counteracts the disturbance.

Front

What is the formula for calculating freezing point depression?

Back

ΔTf = i * Kf * m, where i is the van 't Hoff factor, Kf is the freezing point depression constant, and m is the molality.

Front

What does it mean if Q = K in a chemical reaction?

Back

The reaction is at equilibrium.