Which of the following is an example of a chemical change?

a.

ice melting

b.

pounding gold into a coin

c.

milk souring

d.

a puddle of water evaporating

In the rate law, k is a universal constant. True or False? (I have more questions on profile)

What causes the entropy to change when a solute dissolves in a solvent? A. The solute becomes less ordered. B. The solute becomes conductive. C. The solute changes the vapor pressure. D. The solute changes the enthalpy.

Why are hydrogen ions and hydroxide ions omitted from the net reaction for the hydrolysis of water?

Is the reaction first order or second order with respect to the concentration of no2?

Which of the following factors contributes to the decrease in ionization energy within a group in the periodic table as the atomic number increases?

How many total electron will fit in the 1st energy level

Which statement best explains how the models differ? Model A shows the formation of ions, and model B does not show the formation of ions. Model A does not show the formation of ions, and model B shows the sharing of electrons.

What is the enthalpy of combustion (per mole) of C3 H8 (g) ?

Describe how speed, velocity and acceleration are related?

What is 3 ethyl 3, 4 dimethylheptane abbreviated structural formula?