In order to increase the rate of a reaction, heat may not always be the best option. Describe why someone might choose to add a catalyst instead of heat.

Imagine you have a membrane through which oxygen can diffuse with a diffusion coefficient D = 5x10-10 m2/s. The concentration of O2 on one side of the membrane is 5x1022 atoms/m3, and on the other side it is 3.5x1022 atoms/m3. If the membrane is 2.

What effect will the number of particles and temperature have on the rate of diffusion of gas molecules? A. The rate of diffusion decreases with the increase in number of particles and temperature. B.

A liquid has a density of 1.17 g/cm3, how many liters of the liquid have a mass of 3.75 kg

If you have 3.8 x 10^24 molecules of O2 at STP how many liters of O2 do you have? Show all work for credit.

A 100 mL graduated cylinder was filled with water to the 50 mL mark. A rock was then added to the cylinder. After the rock was added, the volume of the cylinder was 65 mL. What is the volume of the rock?

How many grams of sodium ions are in na2so4?

Electron configuration for iron?

Explain how melting is considered endothermic

In the process of covalent bonding, atoms share electrons. This means that * a) Electrons from each atom are attracted to the nucleus of both atoms b) Protons and neutrons attract c) Atoms lose electrons and become ions d) Atoms gain electrons and

Give the full atomic symbol for an atom that has 30 neutrons and an atomic number of 25