The half-life of a certain radioactive element is 1250 years. what percent of the atom remains after 7500 years?

What are two foods that have acid in them

What is the effect of decreasing the volume of the reaction mixture? What is the effect of decreasing the volume of the reaction mixture? Decreasing the volume causes the reaction to shift right.

Compare and contrast the uses of the iron triad and the use of the coinage metals

Describe how physical and chemical change may have affected by temperature

Excuse me what is 6=2 (y+2) ?

Which of the following has the greatest mass, in grams? a. 1 atom of lead (Pb) b. 0.5 mol copper (Cu) atoms c. 0.3 mol gold (Au) atoms d. 25 atoms of mercury (Hg)

Which one is not a sedimentery rock a.) sandstone b.) limestone c.) quartz d. (coal

Which group is more reactive than the alkaline earth metals?

Why do you not want any of the water on the outside of the test tube to drip off into the calorimeter?

What is the mass of an original 5.60-gram sample of iron-53 that remains unchanged after 25.53 minutes?