Carbon-14 has a half-life of 5720 years and this is a first order reaction. If a piece of wood has converted 25% of the carbon-14, then how old is it?

Why is a chemical indicator added to the flask in which a titration will occur? A to show when enough base has been added B to determine the starting pH of the solution C to neutralize the acid before adding the base D to identify the starting

Dinitrogen monoxide gas is collected at 19.0 °C in an evacuated flask with a measured volume of 30.0 L. When all the gas has been collected, the pressure in the flask is measured to be 0.500 atm.

Can a element be lost or gained in a chemical reaction

Which of the following is not a process of a stream load? A. Suspension B. Materials in solution C. Divide D. Bed Load

What molecule is used to capture light energy? view available hint (s) what molecule is used to capture light energy? chlorophyll water carbon dioxide nadph atp?

Complete the reactions to show how butanoic acid may be converted to phenyl propyl ketone.

As a sample of the radioactive isotope 131I decays, its half-life (1) decreases (2) increases (3) remains the same

How many Joules of energy are required to change 10.0 gram of ice at - 2.0 C to water at 20.0 C? (use your constants) 440 J 66,000 J 880 4220 J

Why are Van der Waals forces important? A) They determine how strong dipole moments will be in polar covalent molecules B) They are the strongest type of intermolecular force that can act on polar and non-polar molecules C) They are primary

When heat is added to or removed from a substance, it may change its state. What state will most likely result if heat is added to a liquid?