2. Indica cuál de los siguientes problemas estudia la física y cuál estudia la química. Justifícalo. a) La composición de un perfume.
b) La capacidad de un metal para conducir el calor.
c) Si un objeto flota o no en el agua.
d) Los gases que se desprende cuando arde un combustible.
e) Si los combustibles son densos o ligeros.

Write a balanced equation showing the formation of copper (ii) nitrite from its elements

15) a substance used in manufacturing gasoline consists of finely divided platinum supported on an inert solid. suppose that the platinum is formed by the high temperature reaction between platinum (iv) oxide and hydrogen gas. the other product is water. a) write and balance the equation b) how many grams of hydrogen are needed to produce 1.0 g of platinum metal? c) how many moles of water are produced at the same time? how many grams? ( show work, .)

Consider the reaction: 2al(s) + fe2o3(s) → al2o3(s) + 2fe(s) the δhf for fe2o3(s) = -824.3 kj/mole. the δhf for al2o3(s) = -1675.7 kj/mole. finish the equation. δhrxn = [(1)( kj/mole) + (2)( kj/mole)] - [(1)( kj/mole) + (2) ( kj/mole)]