What does the half-life tell about a radioisotope? a. how long it takes for half of a sample to decay to another form b. how long it takes for half of the sample to begin to decay c. how long it takes a sample to lose half of its neutrons d. how long it takes a sample to become completely stable

In the following redox reaction which is the oxidizing agent and which is the reducing agent? alcl3 + na nacl + al

You are making a solution of calcium chloride dissolved in water. you add solid, stir, and it dissolves. you add just a spatula tip full, stir, and the solid does not dissolve. how could you describe the solutions before and after adding the spatula tip amount

Sulfur dioxide and oxygen react to form sulfur trioxide during one of the key steps in sulfuric acid synthesis. an industrial chemist studying this reaction fills a 25.0l tank with 4.5 mol of sulfur dioxide gas and 4.5 mol of oxygen gas at 30.°c. he then raises the temperature, and when the mixture has come to equilibrium measures the amount of sulfur trioxide gas to be 1.4 mol. calculate the concentration equilibrium constant for the reaction of sulfur dioxide and oxygen at the final temperature of the mixture. round your answer to 2 significant digits.