Write a hypothesis for this: Eating Breakfast increases performance in school

Which of the following is true about chemical equilibrium systems? A. They are open systems. B. The macroscopic properties are not constant. C. Forward and reverse reaction rates are not equal. D.

Which of the following has more energy than visible light? radio waves microwaves infrared light gamma rays

A beta particle consists of a fast moving electron and has a (negative/positive) charge

Approximately how many moles of N2 are in 200 moles of clean dry air?

For the reaction PCl5 (g) + heat PCl3 (g) + Cl2 (g), what will happen when the volume is increased? A. There will not be a shift in equilibrium. B. There will be a shift toward the products. C. There will be a shift toward the reactants. D.

Limes have a [H3O+] of 1.3 x 10-2 mol/L. Their pOH is

The human body is 0.0040% iron. How many milligrams of iron does a 165 pound person contain?

Which of the following is the correct Lewis structure for ammonia (NH3) ? Note: Hydrogen and nitrogen have one and five valence electrons respectively.

Which of the following statements is true? A. Particles of a solid have a very orderly, three dimensional arrangement and do not move B. Particles of a liquid change shape and volume C.

How does hess's law use intermediate reactions to calculate the enthalpy of a desired reaction?