Based on the results of this lab, write a short paragraph that summarizes how to distinguish physical changes from chemical changes.

A pot contains 6 L of brine at a concentration of 110 g/L. How much of the water should be boiled off to increase the concentration to 200 g/L?

What has to be true of a substance for it to dissolve in water?

List two things (number them 1 and 2) that are special about hydrogen allowing it to form hydrogen bonds when bound to oxygen: 1 ... 2 ...

At constant temperature, a sample of helium at 760. mmhg in a closed container was compressed from 5.00 l to 3.00 l, with no change in moles or temperature. what was the new pressure exerted by the helium on its container?

What triggers the development of a tornado?

Is Ba (NO3) 2 covalent or ionic

An alcohol contains only C, H, and O. When a 1.50mg sample of the alcohol is burned completely in oxygen, 3.30mg of CO2 and 1.80mg of H20 are formed. What is the empirical formula for the alcohol?

Using the field meter, does the field strength increase or decrease as you move away from the bar magnet?

Complete each of the definitions with the appropriate phrase. Precision means that measurements are close to Accuracy means that measurements are close to Anawer Bank each other an accepted value |individual several

Acetylene is hydrogenated to form ethane. the feed to the reactor contains 1.4 mol h2/mol c2h2. (find properties of the reactants/products in appendix of book) a.