(edit: nvm i got it here's some free points) Which phrase describes carbon-14 dating? uses the rate at which nitrogen-14 decays into carbon-14 dates the remains of organisms to determine when they died measures the number of unstable elements in ancient volcanic rocks determines the age of ancient fossils older than 50,000 years old

Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.

Consider the reaction of a(g) + b(g) + c(g) => d(g) for which the following data were obtained: experiment initial [a], mol/l initial [b], mol/l initial [c], mol/l initial rate, mol/l.s 1 0.0500 0.0500 0.0100 6.25 x 10^-3 2 0.100 0.0500 0.0100 2.50 x 10^-2 3 0.100 0.100 0.0100 1.00 x 10^-1 4 0.0500 0.0500 0.0200 6.25 x 10^-3 what is the rate law for the reaction?

If i had 2 m naoh solution, what does the 2 m stand for? 2 molar, but 2 of a solute in 1