A radioactive element is half disintegrated in 40 minutes. What is the time required for the decay of 75% of the element

A group of students perform three trials in a lab and determine the density of aluminum to be 2.1, 2.12, and 2.09 g/cm³ if the true density of aluminum is 2.7 g/cm³ what is the percent error of their lab

You are taking a road trip and your car gets 25 miles to the gallon. It has a gas tank which holds 14 gallons of gas. If this is the case, how many times will you have to fill up the tank if your trip distance is 250 miles?

Give examples of other amino acids that serve as precursor and state for what?

The molar mass of butane (C4H10) is 58 g/mol. If a student measured the molar mass of butane to be 69, what is the % error of the measurement?

The following data is given to find the formula of a Hydrate: a. Mass of crucible: 13.56g b. Mass of crucible and salt CaSO4. H2O hydrate: 16.05g c. Mass of crucible and salt CaSO4 anhydrate: 15.07 Find the mass of CaSO4.

Which of the following radioactive emissions is the least penetrating, aloha particles, beta particles or gamma rays

The three major groups p On the periodic table are the

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?