How much of a sample remains after five half-lives have occurred?

A. 1/5 of the original sample

B. 1/25 of the original sample

C. 1/32 of the original sample

D. 1/64 of the original sample

The electron configuration for an atom is 1 s 2 2 s 2 2 p 2. How many electrons does the atom have? A. 6 B. 2 C. 5 D. 4

What is the mass in frames of 1.56! moles of aspertame

Which of the following has the most kinetic energy? A car traveling at 80 kph. incorrect answer B tractor-trailer traveling at 80 kph. incorrect answer C cheetah running at 80 kph. incorrect answer D motorcycle traveling at 80 kph.

Why must model sometimes be changed

Some headache medicines are fine powders that are dissolved in water and then ingested. These medicines claim they work faster than other medicines. Could this be true? Why or Why not? A.

What is the molality of a solution containing 100 grams of glucose (C6H12O6, molar mass = 180 g/mol) dissolved in 2.5 kg of water? 0.22 m 72 m 7200 m 40 m

A battery is constructed based on the oxidation of magnesium and the reduction of cu2+. the initial concentrations of mg2 + and cu2 + are 1.2*10-4 m and 1.44 m, respectively, in 1.0-liter half-cells. how long can the battery deliver 5.

A buffer solution is made that is 0.417 M in and 0.417 M in. If for is, what is the pH of the buffer solution? pH = Write the net ionic equation for the reaction that occurs when 0.120 mol is added to 1.00 L of the buffer solution.

BaCl2 (aq) + AgNO3 (aq) → Express your answer as a chemical equation. Enter noreaction if no precipitate is formed.

Make a list of physical changes and chemical changes that you observe or see effects of in the school