After 4 half-lives have elapsed, the amount of a radioactive sample which has not decayed is

The theoretical yield for a reaction is 80 grams. The reaction ends up having a percent yield of 40%. How many grams were actually produced in the reaction? 3.2 g 32 g 50 g 80 g

Prefix meaning "ring-shaped"

How does H2So4 break up to h + & hso4 - ?

F has ___ valence electrons.

Examining a corpse, you find many second instars and a few third instars on the body and moving away from it You find no pupae in the ground within 10 m of the corpse. The average ambient temperature over the past month was 70°F (21.

When a catalyst lowers the activation energy of a reaction the rate of the reaction?

Liquids: A) must be contained to stay in one spot B) have a variable volume, but a fixed mass C) are usually more dense than solids and gases D) cannot be changed into gases

Given the following list from the activity series of metals (from most active to least active) K, Na, Al, Mn, Cr, Cd, Co, Pb, Hg which reaction would you NOT expect to occur? 1. Co²⁺ (aq) + Al (s) → Al³⁺ (aq) + Co (s) 2.

Chemical reactions that release energy A. will not occur. B. need catalysts to occur. C. will always explode. D. often occur spontaneously.

Which metal exist in liquid state and can be cut with knife?