Which nuclides are used to date the remains of a once-living organism?

(1) C-14 and C-12 (3) I-131 and Xe-131

(2) Co-60 and Co-59 (4) U-238 and Pb-206

What ion must be present for a compound to be considered a base?

What effect does rapid exhalation of CO2 during exercise have on the concentration of H2CO3 in the blood?

How does a system at equilibrium respond to the addition of more reactant

Which of the following steps will speed up the reaction between coal and oxygen? Keep the coal in a wide dish Decrease the temperature of oxygen Increase the temperature of coal Keep the coal in a narrow test tube

Io, one of Jupiter's moons, is about the size of Earth's moon. Io has a radius of about 1.85 x 106 m, and the mean distance between Io and Jupiter is 4.22 x 108 m. Jupiter has a mean radius of 7.15 x 107m, and a mass of 1.90 x 1027kg.

How much ice at a temperature of - 17.5 ∘C must be dropped into the water so that the final temperature of the system will be 31.0 ∘C?

Why does a gas fill completely the vessel in which it is kept?

Individuals who work full time and those who work part-time enjoy basically the same number of paid leave benefits. True False

There is a large increase in ionization energy between the second and the third ionization energies of a metal. What kind of ion is the metal likely to form? Include the charge in your answer.

Which of the following are true statements about equilibrium systems? For the following reaction at equilibrium: CaCO3 (s) ⇌ CaO (s) + CO2 (g) adding more CaCO3 will shift the equilibrium to the right.