Asingle atom of an element has 11 protons, 11 electrons, and 12 neutrons. which element is it?

How many grams of magnesium metal will react completely with 8.3 liters of 5.5m hcl? show all work

Which statement is true about a catalyst? a: a catalyst decreases the rate of the reaction. b. a catalyst is consumed during a chemical reaction. c. a catalyst lowers the activation energy of a reaction. d. a catalyst increases the reactant concentration during a reaction.

All of the following are homogeneous mixtures except a) sugar dissolved in water. b) orange juice. c) coffee with cream. d) household vinegar. e) apple juice