How does phenolphthalein work as an indicator

How does an atom become an ion with a - 2 charge?

In an experiment plants are fed once daily for one week. There are four plants the first is given oil, the second one vinegar, third one water and fourth one sugar. What is the manipulated variable?

What term refers to rows of elements

Which of the following is a possible set of quantum numbers for an electron? (1, 1, 0, + ½) (2, 1, 2, + ½) (4, 2, 0, - ½) (3, - 2, 1, - ½)

Which of the following most likely represents the specific gravity of granite? 2.7 3.0 3.3 5.5

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.