Which of the following is a correct and balanced equation showing the reaction of calcium and oxygen? (while several of the equations may be balanced, only one has the correct products and reactants as well as being correctly balanced.) a. a. ca + o2 = cao b. b. ca + o2 = cao2 c. c. 2ca + o2 = 2cao d. d. 4ca + o2 = 2ca2o e. e. ca + o2 = ca2o 26-3.

Which of the following methods uses the decay of atomic particles in an object to find its exact age? a. fossil dating b. geologic dating c. radioactive dating d. relative dating

Estimate the molar mass of the gas that effuses at 1.6 times the effusion rate of carbon dioxide.

[ou.03jthe pictures below show the wavelengths and intensities of electromagnetic radiations emitted by three stars, star 1, star 2, and star 3. intensity intensity- intensity- 1000 3500 6000 8500 11000 wavelength (a) star 1 1000 3500 6000 8500 11000 1000 3500 6000 8500 11000 wavelength (a) wavelength (a) star 2 star 3 which of these statements is correct about the color of the three stars? star 2 is white in color o star 2 is yellow in color star 1 and star 3 are yellow in color star 1 and star 3 are white in color