Different forms of this element are often used in a type of radiometric datingthat determines the ages of objects up to about 40,000 years. o a) argonob) carbono c) uraniumod) potassium

219 grams of iron (iii) oxide reacts with excess carbon according to the reaction equation shown below. fe2o3 + c → fe + co2 after a scientist performs the chemical reaction they find the actual yield of iron to be 57.4 grams. calculate the percent yield of this chemical reaction.

Which change to the system wood cause the freely-moving piston to lower?

Sum of brother and sisters age is 26. four times the brothers age is subtracted from three times the sisters age, the difference is 8. what are the ages of the brother and sister?