Lucas compared the mass of a bag of blocks and the mass of a bag of sand. When he put each bag on the scale he observed that the scale was balanced. What is the best explanation for why this happened? One of the bags has a greater mass than the other bag.

The bag of blocks and the bag of sand have the same mass.

The scale must be broken since two bags cannot have the same mass.

One of the bags has a lesser mass than the other bag.

1. suppose a reaction mixture, when diluted with water, afforded 300 ml of an aqueous solution of 30 g of the reaction product malononitrile [ch2(cn)2], which is to be isolated by extraction with ether. the solubility of malononitrile in ether at room temperature is 20.0 g/100 ml, and in water is 13.3 g/100 ml. what weight of malononitrile would be recovered by extraction with (a) three 100-ml portions of ether and (b) one 300-ml portion of ether? suggestion: for each extraction, let x equal the weight extracted into the ether layer. in part (a), the concentration in the ether layer is x/100 and in the water layer is (30 x)/300; the ratio of these quantities is equal to k 20/13.3.

Chemical energy is a form of a. kinetic energy only. b. both potential and kinetic energy. c. neither potential nor kinetic energy. d. potential energy only. reset

In one or two grammatically correct sentences, write a definition for the term molecule geometry