What causes the difference in physacal charactoristics like hair color among people

The difference between the atomic number of an element and the element’s atomic mass is the number of ions.

Which of these is a physical property

How does a catalyst increase the speed of a reaction? a. the catalyst eliminates the activated complex stage, allowing products to form immediately. b. the catalyst lowers the energy level of the reactants, making it easier for them to react. c. the catalyst makes it easier for the activated complex to form, lowering the activation energy. d. the catalyst raises the energy level of the products, making the reaction finish sooner. reset next