How is a pure substance different from a mixture? A. Pure substances are separated by physical means B. Mixtures cannot be separated by physical means C. A pure substance is heterogeneous D. Mixtures are made up of more than one component.

You are to give ampicillin with a recommended dose of 25mg/kg to a child with a mass of 29kg. if stock on hand is 250mg/capsule how many capsules should be given?

What is the most stable monatomic ion formed from nitrogen

You encounter a solution that is acidic and you decide to test it by adding a small amount of a strong acid. the ph lowers slightly but is approximately unchanged, and still remains acidic. what can you say about the solution? a. it is a buffer solution. b. it is not a buffer solution it is a strong acid solution. d. the solution has been neutralized. e. the solution has excess acid present