A variable is the factor in a controlled investigation that does not change. True or False

A chemical engineer calculated that 15.0 mol H2 was needed to react with excess N2 to prepare 10.0 mol NH3. But the percentage yield of the reaction is 60.0%. a. Write a balanced equation for the reaction b.

Calculate the number of atoms in a 7.45x10^3 g sample of sodium

Which of the following is not covered by skin? A. Bones B. Intestines C. Mouth D. Stomach

Saturated hydrocarbon molecules may be bonded in which type of structure?

which of the following is not an example of a chemical reaction? A. a loaf of bread is baked in an oven B. a loaf of bread molds in a pantry C. a loaf of bread is sliced with a knife D. a loaf of bread is digested in the stomach

Complete and balance the molecular equation, including phases, for the reaction of aqueous ammonium bromide, nh4br, and aqueous lead (ii) acetate, pb (c2h3o2) 2.

A magnesium atom has 2 valence electrons in its third shell. Which is a TRUE statement about what happens when it forms an ion? A. It will be an anion. B. It will have more electrons than protons. C.

What scientific discoveries led to changes in Dalton's atomic theory?

What does berkelium react with

Classifying living things