A heating curve has two flat lines, or plateaus. What does the plateau at the higher temperature represent?

1. Boiling of a liquid

2. Melting of a solid

3. Increase in temperature of a substance

4. Decrease of a substance

What are the molality and mole fraction of solute in a 22.3 percent by mass aqueous solution of formic acid (HCOOH) ?

A chunk of silver has a heat capacity if 42.8 j/*c. If the silver has a mass of 181g, calculate the specific heat of sliver.

List the information you need to find how many milliliters of a stock solution of 2.00m mgso4 you would need to prepare 100.0 ml of 1.00m mgso4

Liquid X has a pH of 7 and Liquid Y has a pH of 8.5. Which statement is true? Liquid X is a base and Liquid Y is an acid. Liquid X is an acid and Liquid Y is a base. Liquid X is neutral and Liquid Y is a base.

Look at the equation below. O2 + CS2 → CO2 + SO2 Which of the following shows the equation balanced? A. 3 O2 + CS2 → CO2 + 2 SO2 B. 3 O2 + CS2 → 2 CO2 + SO2 C. O2 + CS2 → CO2 + SO2 D. 4 O2 + 4 CS2 → 4 CO2 + 4 SO2

Find δe for the change in state of 1.0 molh2o (l) at 79 ∘c to h2o (g) at 116 ∘c. the heat capacity of h2o (l) = 75.3 j/molk, heat capacity of h2o (g) = 25.0 j/molk, and the heat of vaporization of h2o is 40.7*103j/mol at 100 ∘c.

Balloon A started with a volume of 1.76 L. The temperature of the room the balloon was in was 295 K. The balloon was heated to a temperature of 253.15 K. What is the new volume?

The standard internal energy change for a reaction can be symbolized as ΔU°rxn or ΔE°rxn. For the following reaction equations, calculate the energy change of the reaction at 25 °C and 1.00 bar. Sn (s) + Cl2 (g) - - - > SnCl4 (l) + H (KJmol) - 511.3.

You transfer a sample of a gas at 17°C from a volume of 5.67 L and 1.10 atm to a container at 37°C that has a pressure of 1.10 atm. What is the new volume of the gas?

What is true about the energy involved in a chemical reaction? A. The amount of energy is constant, but it is converted from one form to another. B. The amount of energy decreases as it is converted from one form to another. C.