The following pictures represent aqueous solutions of three…

The following pictures represent aqueous solutions of three acids HA (A = X, Y, or Z), with water molecules omitted for clarity. Unshaded spheres represent hydrogen atoms or ions and gray spheres represent A atoms or ions. Which of the three is the weakest acid?

Assume that you have a sample of gas in a cylinder with a mo…

Assume that you have a sample of gas in a cylinder with a moveable piston, as shown in diagram (1). The initial pressure, number of moles, and temperature of the gas are noted on the diagram. Which diagram (2)-(4) most closely represents the result of doubling the pressure and doubling the temperature while keeping the number of moles of gas constant?