A student diluted 1ml of a stock solution (1M) of a compound with 9 ml of water. Then took 1ml from that solution and diluted with another 9ml of water. Then took 10ml of the resultant solution and added 90ml of water. What is the final concentration of the solution

Observation and experimentation have led many scientists to accept a theory about the origin of the universe. this theory is called the big bang theory. scientific evidence collected and observed by scientists around the world suggests that the universe is ever expanding from a hot and dense initial state. what makes this a scientific theory? (2 points)

In the diagram here that represents the reaction, which reactant, a or b, is the limiting reagent?

What is the relative mass of an electron? a) 1/1840 the mass of a neutron + proton b) 1/1840 the mass of an alpha particle c) 1/1840 the mass of a c-12 atom d) 1/1840 the mass of a hydrogen atom