Which of the following is not a sign that a chemical change has occurred?

-Change in energy

-Change in mass

-formation of precipitate

-Change in color

In a controlled scientific experiment, A. all variables are kept constant. B. one or more variables are kept constant. C. no variables are kept constant. D. only one variable can be kept constant. Reset

Write an expression for the equilibrium constant of each chemical equation: a. SbCl5 (g) SbCl5 (g) + Cl2 (g) b. 2 BrNO (g) 2 NO (g) + Br2 (g) c. CH4 (g) + 2 H2S (g) CS2 (g) + 4 H2 (g) d. 2 CO (g) + O2 (g) 2 CO2 (g)

Understand how energy is transferred in appliance

What will happen to the physical state of gases if pressure is increased and temperature is decreased?

Raising solvent temperature causes solvent-solute collisions to become

How should scientist respond when new evidence that challenges current is presented?

Consider the following reaction, equilibrium concentrations, and equilibrium constant at a particular temperature. Determine the equilibrium pressure of H2. D2 (g) + H2 (g) ⇌ 2 HD (g) Kp = 1.80 P (D2) eq = 1.1 * 10-3 atm P (HD) eq = 2.7 * 10-3 atm

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.