Butter melts when you heat it in a pan or on the stove is this a chemical change or a physical change? how can you tell?

The empirical formula/s mass is equal to or greater than that of the molecular formula's molecular mass.

How many moles of pbcl2 are consumed if 14 moles of alcl3 are consumed?

What happens to your blood glucose level if you do not eat lunch? is a testable question?

The chemical formula for baking soda NaHCO3, (with a little 3) '. How many sodium atoms are there in one molecule of baking soda? A. 1 B. 2 C. 3 D. 4

Which of the following reactions have more entropy in the products than the reactants? A. C3H8 (g) + 3O2 (g) CO2 (g) + 4H2O (l) B. 2H2O (l) 2H2 (g) + O2 (g) C. 4Ag (s) + O2 (g) 2Ag2O (s) D. S (s) + O2 (g) SO2 (g)

4. You are preparing 250 mL of gel mix for protein electrophoresis, which requires a final concentration of 1.6% SDS. The lab has a 10% stock solution of SDS.

During a chemical change, substances react to form a new substance. Some signs of chemical change are gas formation, a change in color, or the production of heat.

What are mols and how are they calculated

Why do nuclear power plant's use fission in stead of fusion

Why does temperature change equilibrium constant