Does a physical change affect the identity of a substance

Why is inaccurate to say CO is 50 percent oxygen

Which of the following is a property shared by all of the elements in group 18 on the periodic table? A. They all have a strong odor. B. They are all brightly colored. C. They all have high chemical reactivities. D. They are all gases.

Which actions are part of the dissolution process of an iconic solute in water?

Andy puts some pieces of paper on a drum and then hits the drum with a drumstick. What observation supports the idea that sound is produced by vibration?

Butane (c4h10) undergoes combustion in excess oxygen to generate gaseous carbon dioxide and water. given δh°f[c4h10 (g) ] = - 124.7 kj/mol, δh°f[co2 (g) ] = - 393.5 kj/mol, δh°f[h2o (g) ] = - 241.8 kj/mol, how much energy is released (kj) when 8.

What are the structural features of purines and pyrimidines?

Why does bromine not react with sulphur?

What happens to the size of the atom of anon-metal as it becomes an anion? A. it decreases B. it increases C. it remains the same D. it is impossible to tell unless you know the specific element

How is oxygen and nitrogen alike

Does a gas discharge tube filled with boron emit the same wavelength