A radioactive isotope has a half-life of 2.5 years. Which fraction of the original mass remains unchanged after 10 years?

Which substance is a strong electrolyte?

A small atomic bomb releases energy equivalent to the detonation of 14,000 tons of tnt; a ton of tnt releases 4? 109 j of energy when exploded.

Which of the following solutions can be used to neutralize HNO3? Ca (OH) 2 HCI H2O Lemon Juice

When magnesium combines with sulfur to form magnesium sulfide, it is oxidized to Mg2+. Which statement is true about this reaction

If you have 0.5 L of air in a rigid, sealed container at a pressure of 203 kPA and a temp of 203. You heat the contain to 273 K. What is the final pressure of the air? 151 kPA 102 kPA 273 kPA 310 kPA

A substance that permits the flow of electrons is a (n a. conductor b. insulator

If 1/8 of an original sample of krypton-74 remains unchanged after 34.5 minutes, what is the half life of krypton-74?

If a measurement is recorded as 1.2 cm what's the smallest marking on the instrument

Why do the ions in an ionic bond stay together, aka form the bond?

Is it ever possible to extract 100% of a compound from a solution? Why or why not?