Is it possible for 2 different elements to have the same atomic number

Assuming 54.81 grams of Al are consumed in the presence of excess copper II chloride dihydrate, how many grams of AlCl3 can be produced if the reaction will only produce 66.93 % yield?

1. A sample of radon has a half-life of 15 hours. What fraction of the sample is left after 60 hours have passed?

Which changes occur when O2 (g) is added to this system? Given the system at equilibrium: 2POCl3 (g) + energy 2PCl3 (g) + O2 (g). A.) The equilibrium shifts to the right and the concentration of PCl3 (g) increases. B.

What is one chemical property of iron? A) Iron is malleable. B) The density of iron is 7.86 g/cc. C) Iron combines readily with oxygen. D) Iron is a good conductor of electricity and heat.

Why is water needed to provide spacecraft with oxygen

In which of these samples do the molecules most likely have the least kinetic energy?

Just as heat can denature enzymes, so can a change in the pH. Enzymes that normally work in an acidic environment in the body can become denatured if the pH becomes too alkaline.

A group of students wants to see how temperature affects the time it takes for spilled water to dry up in the investigation what will be the dependent and independent variables

What is not true of white light?

Diatoms and some yeasts are unicellular eukaryotes that have mechanisms of nuclear division?