4Al + 3O2 → 2Al2O3 How many grams of aluminum are required to produce 3.5 moles Al2O3 in the presence of excess O2

The pH of the acid in the stomach is 2. When a person has heartburn, the acid in their stomach is coming up the esophagus (lower throat) and burning the lining of the esophagus. Why would a person take an Alka Seltzer tablet for heartburn?

Which observation supports the idea that light is made of particles?

At room temperature, the surface tension of water is 72.0 mJ·m-2. What is the energy required to change a spherical drop of water with a diameter of 1.

Which is example of pure chemistry

What method used to separated coffee grain from coffee solution

Samuel adds a teaspoon of salt to a glass of water. He notices that the song disappears. Samuel takes a sip to discover that the water taste salty. What kind of change has occurred?

How are the physical and chemical properties of atoms represented on the periodic table of elements

how do we know isotopes exist?

Is albinism a dominant or recessive trait

If T = dominant, and t = recessive, what would the genotypes be?