Do the periods on the periodic table represent the energy levels for atoms

Now consider the reaction when 45.0 g NaOH have been added. What amount of NaOH is this, and what amount of FeCl3 can be consumed by it?

A rock sample contains 4.5g of Potassium-40 and 31.5g of its daughter isotope (Argon-40). How old is the rock sample if Potassium-40 has a half-life of 1.3 billion years?

Why does liquid bromine react slowly as compared to bromine vapor

The winner of a 10 km road race took half an hour to complete the race. Calculate her average speed. Give your answer in metres per second.

A gas at STP occupies 0.028 L of space. If the pressure changes to 3.8 atm and the temperature increases to 203 C, what is the new volume? Show your work. Don't forget to convert C to kelvin

A solution containing 292 g of Mg (NO3) 2 per liter has a density off 1.108 g/ml. What is the molarity of the solution?

Ozone, o3 (g), is a form of elemental oxygen produced during electrical discharge. is δh∘f for o3 (g) necessarily zero?

Calculate the molecular mass of carbon dioxide (CO2) :

You and your lab partner are asked to determine the density of an aluminum bar. The mass is known accurately to 4 significant figures. You use a simple metric ruler to determine its size and calculate the results in column A.

What is more inflammable? gasoline or ethanol?