In a science lab, a teacher instructed students attach a piece of very fine steel wool to a clamp stand inside a fume hood. The students then lit a burner placed under the steel wool. The metal strands began to glow bright red and flames filled the steel After the burner was turned off, the metal continued to burn, leaving behind reddish brown strands that collapsed into a powder when it was touched after cooling . Based on these observations , did the steel wool undergo a chemical change or a physical change? Explain your answer.

The correct answer is b

You use the atomic number to find out how many protons and neutrons there are in the atom. you use the atomic mass to find out how many protons and electrons there are in the atom. 

Ithe undersigned only for use your own email and delete any and copies and of the itself and to be there is a good timewhat does a decrease in temperature indicate about the molecules in a sample of liquid water? decreased chemical energy of the moleculesdecreased kinetic energy of the moleculesincreased chemical energy of the moleculesincreased kinetic energy of the moleculeshow does a sample of helium at 15 â°c compare to a sample of helium at 215 k? the helium at 15 â°c has a higher average kinetic energy than the sample at 215 k.the helium at 15 â°c has lower nuclear energy than the sample at 215 k.the helium at 15 â°c has slower-moving atoms than the sample at 215 k.the helium at 15 â°c has smaller atoms than the sample at 215 k.