What part of an original isotope's number of atoms remains after two half lives?

different student is given a 10.0g sample labeled CaBr2 that may contain an inert (nonreacting) impurity. Identify a quantity from the results of laboratory analysis that the student could use to determine whether the sample was pure.

Why do noble metals do not corrode in air?

What do you often notice after you balance a hydrocarbon combustion reaction equation? O A. Sometimes the coefficient for the oxygen molecule is not a whole number O B. Sometimes the oxygen molecules do not balance in the equation. O C.

Convert 100 degrees Celsius to Fahrenheit

70 mL of liquid (density = 0.85 g/mL) is added to a graduated cylinder that has a mass of 60.75 g. what is the mass of the cylinder plus the liquid?

Solution A has a pH of 3 and solution Z has a pH of 6. How many times greater is the hydronium ion concentration in solution A than the hydronium ion concentration in solution Z? (1) 100 (3) 3 (2) 2 (4) 1000

Based on the leaf cross section shown above what do you know about the plant from which it came

When 5 grams of KCl are dissolved in 50. grams of water at 25°C, the resulting mixture can be described as (1) heterogeneous and unsaturated (2) heterogeneous and supersaturated (3) homogeneous and unsaturated (4) homogeneous and supersaturated

What part of the divers body is affected the most from pressure change

Find the pH of a solution whose H + concentration is 1.8 x 10-12