— refers to the brain’s selective elimination of connections due to infrequent use and lack of          stimulation.

How many Cl atoms are in 0.0728 g of PCl3?    

Classify the following reaction by giving all of these reaction type(s) that apply.I. redox            II. combination    III. decomposition        IV. displacement               V. metathesis 2PbO(s)   +   O2(g)   →   2PbO2(s)     

Witherite is a mineral that contains barium carbonate. If a 1.68-g sample of witherite were to react completely with 24.6 mL of 0.2558 M HCl, what would be the percent of barium carbonate in the witherite sample? (Barium carbonate is the only compound present that reacts with the hydrochloric acid.)                                BaCO3   +   2 HCl     →     BaCl2   +   CO2   +   H2O

A 12-oz can of soda pop costs fifty cents. A 2.00 L bottle of the same variety of soda pop costs $1.29. How many times more expensive it is to buy the 12-oz can of pop compared to buying it in a 2.00 L bottle?  (1.00 L = 1.057 quart and 1 quart contains 32 oz) 

The distance between two points

Write 15,968 in scientific notation.

The amount of matter occupied by an object.

The amount of space occupied by an object.

Write 3.98 x 10-6 in standard form?