in a first order reaction x=y , if k is the rate constant and the initial concentration of the reactant x is 0.1M , then, the half life is

Which of these is a physical property

How many moles of oxygen gas are produced from the decomposition of six moles of potassium

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.