How much heat (Q) is lost by a 10.55 g piece of steel (c = 0.466 J/gC) that is cooled from 1200.0 C to 40.0 C? Equation: Q = mc(T-T) Be careful about sign!

What amount of heat is exchanged when 106.2 grams of substance y goes from a liquid at 35 degrees celsius to a solid at the same temperature? melting point of substance y = 35 degrees c; δhvaporization = 3.67 j/mol; δhfusion = 3.30 j/mol. mwsubstance y = 28.22 g/mol. −12.4 j −3.51 x 102 j 1.24 x 101 j 351 j

What is the compound name for the formula [ru(en)2cl2]2+ and [co(en)cl2br]-

The comparison of the number of atoms in a copper coin the size of a penny with the number of people on earth is made to illustrate which of the following? a. that atoms are indivisible b. that atoms are very small c. that atoms are very large d. that in a copper penny, there is one atom for every person on earth