How do the atomic mass and atomic number compare for helium?

What is the atomic theory timeline

The following reaction has an activation energy of 262 kJ/mol. C4H8 (g) - --> 2C2H4 (g) At 600.0 K the rate constant is 6.1*10^-8s^-1. What is the value of the rate constant at 750.0 K?

Calculate the number of eggs in 3.25 dozen. Report your answer using the appropriate number of significant figures.

49. Which of the following statements regarding chemical equilibrium is true? Equilibrium is shown with a single arrow and/or an equal sign. A system at equilibrium maintains the concentrations of all reactants/products over time.

What happens to particles as they are heated or cooled, Kinetic Theory of Matter?

1. Does the temperature rise or drop when you mix vinegar and baking soda. 2. Does the temperature rise or fall when you mix baking soda and water.

Use the balanced equation from number four above to determine the limiting reactant if we had a mixture of 5.0 moles of Fe and 4.0 moles of O2.

Using the kinetic theory what happens to oxygen particles as they are cooled

Identify the following: 1. The only 2 liquid elements. 2. The element in period 4, group 0. 3. The second metalloid in period 4. 4. The first element in group 4A.

You are about to open a container of soy milk but notice that there are instructions to "shake well before serving." the soy milk is most likely a