Silicon carbide, an abrasive, is made by the reaction of silicon dioxide with graphite. SiO2 +3 C --> SiC + 2 CO
If 500. g of SiO2 are reacted as far as possible, how many moles of SiC are produced?

The fact that the total amount of energy in a system remains constant is a(n)

A4.86 g piece of metal was placed in a graduated cylinder containing 15.5 ml of water. the water level rose to 17.3 ml. what is the density of the metal. i need the steps of how to solve it to so i can use a formula to work out other problems.

Consider hydrogen in an excited state n = 5n=5 that emits photons to reach the ground state. there are various possible transitions other than straight to the ground state that can occur; for example, it can drop to the n = 3n=3 state followed by the n = 3n=3 to the ground state transition. which of the possible transitions will result in the emission of a photon in the visible region?