The active ingredient in photographic fixer solution contains sodium, sulfur, and oxygen. Analysis of a sample shows that the sample contains 0.97 g of Na, 1.365 g of S, and 1.021 g of O. What is the empirical formula of the substance

NaSO2

Explanation:

The empirical formula is the simplest formula of a compound that shows the ratio of atoms of each element present in a compound. We obtain this empirical formula from the information given by dividing the relative atomic mass of each element by the given mass of each atom. Then we use the lowest ratio to divide through and record whole numbers. Hence the answer.

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

conduction is the transfer of thermal energy (heat in transfer) due to collisions between the molecules in the object. collisions between adjacent atoms and molecules transfer kinetic energy from the warmer to the cooler object. the objects must be in physical contact.