Between Br, F, S, As which has the most electronegativity?

An atom of oxygen is in an excited state. When an electron in this atom moves from the third shell to the second shell, energy is (1) emitted by the nucleus (2) emitted by the electron (3) absorbed by the nucleus (4) absorbed by the electron

What is the relationship between temperature and altitude in the troposphere? As altitude increases, temperature decreases. As altitude increases, temperature increases. As altitude increases, temperatures remain the same.

You have a powder that dissolves in water to form a strong acid. You dissolve 2g of the powder in 100ml of water, and measure the pH to be 4. You would like to form 100ml of a solution with pH 5.

Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride.

What are three examples of solutions?

How many atoms of potassium and how many atoms of oxygen must be present in the compound's formula?

How do geologist use different types of crystal shapes to classify minerals?

5.36 litars of nitrogen gas are at : 25°C and 733 mm Hg What would be the volume at 129 86 and 1.5 atm

What can you determine about a substance from the pH value?

How many grams of H2SO4, would be required to react with 0.75 moles of NaOH?