If 25% of a radioactive element remains after 1,000 years, what is the half-life?

How much sulfur dioxide can be produced by the combustion of 21 tons of sulfur?

Food is pushed into your stomach by

How many molecules are there in 21.4 grams of Ca (OH) 2?

What characteristic of an atom determines its properties? Question options: A. The atomic number of neutrons b. The atomic mass c. The arrangement of electrons around the nucleus d. Arrangement of protons in the nucleus

Methanol enters a distillation column at 43 c. the column does not have a reboiler and uses open steam for heating. the column is at 101.3 kpa. the steam is pure water and is a saturated vapor.

Water exhibits high levels of cohesion due to the polarity of the molecule (positively and negatively charged sides). given this information, which type of bond is responsible for water's cohesion and which atoms interact to form this bond?

scientist have found many marine fossils on the mountain far from any ocean or sea what is the best explanation for these fossils

The change in energy needed to change the state of a substance is

What is the main goal of sustainable agriculture? A. To rely heavily on mechanization, pesticides, and fertilizers B. To produce cheap and abundant food at a high cost C. To feed a growing world without damaging the ecosystem D.

A student requires 2.00 L of 0.100 M NH4NO3 from a 1.75 M NH4NO3 stock solution. What is the correct way to get the solution?