Asubstance is composed of only one kind of atom and can't be separated into simpler substances or converted into another substance by chemical processes.
under which category would you classify this substance?
a) element
b) compound
c) solution
d) suspension

True or false, the three major scales used to measure earthquakes are mercalli scale, richter scale and magnitude scale

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.

How does a hydroelectric power plant converts energy into energy.