A 500g sample of Potassium-40 is left to decay radioactively. The half-life of Potassium-40 is 1.3 x 10 years. Based on this information, in how many years will 31.25g remain?
A)5.2*10^9
B)6.5*10^9
C)7.2*10^3
D)7.8*10^3

Find the number of grams of hcl needed to react completely with .50 moles of magnesium.

3.09 lab: reaction of metals 1 which combinations of substances resulted in a chemical change? for each metal that participated in a chemical change, write the type of metal it is, based on your examination of the periodic table. were there any metallic compounds that did not react with either the acid or the base? write the type of metal, based on your examination of the periodic table. make a general statement about the reactivity of the metals in this experiment.

Total the mass on the syringe. record it in the correct row of the data table. kg done click and drag weights to change the pressure. click the syringe to zoom in and see the volume. intro