If a rock initially contained 10 milligrams of a radioactive substance when it first formed, how much remains after 4 half-lives?

Tyrone wants to buy peanut butter that does not contain any hydrogenated oils. What should Tyrone be concerned about?

The element or compounds that are present after a chemical change

The accepted ΔH for a reaction is - 42.3 kJ/mol. A student has performed a lab experiment to determine the enthalpy change of the same reaction. Calculate the percent error Student 1 Exp. ΔH (kJ/mol) Trial 1 - 43.8 Trial 2 - 41.0 Trial 3 - 42.7

What elements are classified as metalloids? And list 3 characteristics of nonmetals

Convert 1.67 x10^24 atoms of carbon to moles of carbon

Identify the spectator ions in the following complete ionic equation. 2k (aq) s2 - (aq) pb2 (aq) 2no-3 (aq) →pbs (s) 2k (aq) 2no-3 (aq) express your answers as ions separated by a comma.

4. A bird left its post and flew in a triangular path. It flew 21 yards south, 72 yards east and 75 yards diagonally to end back at the post. Is it a right triangle?

Condension occurs in the inside of your windows in Winters, why?

How can you use Hess's law to determine a reaction's enthalpy?

7. How much energy in KJ is released when 15.0 g of steam at 100.0 degrees Celsius is condensed and then frozen to ice at 0.0 degrees Celsius?