2. When iron reacts with oxygen, it forms iron oxide, or rust.

4 Fe + 3 O2 2 Fe2O3

If 112 g of iron (Fe) combines with 24 g of oxygen (O2), how much iron oxide is formed?

A 125 Ml flask and stopper has a mass of 55.263g. a 25.00 mL sample of gasoline is pipetted into the flask. the final mass is 73.385 g. wha is the density of gasoline

Which of the following is the best name for CaF2? calcium fluoride monocalcium difluoride calcium difluoride calcium fluorine

What would be the charge of an atom with more protons? More electrons? Equal number of both?

What conditions are necessary for appreciable conductivity?

Describe, in your words, and using examples, what is meant by the term solubility

What shape is the magnetic field produced when current is passed through a wire? a. Parabolic b. Elliptical c. Circular d. Bimodal

What year was the hole in the ozone layer detect in the antarctica?

Sodium (NA) and potassium (K) are in the same group in the periodic table. Sodium is in the 11th position. How many valence electrons does potassium have? A) 0 B) 1 C) 9 D) 11

Which of the following is not caused by the moon? a. moonrise b. tides c. eclipses d. sunrise

Approximately how many mineral species have scientists identified? 250 5000 1500 60