Enter the appropriate symbol for an isotope of calcium-42 corresponding to the isotope notation azx.
express your answer as a chemical symbol using isotope notation.
40
20ca

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

Which of these is not an example of chemical weathering? a. iron-rich mineral rusting b. feldspar turning into clay c. limestone reacting with acid d. granite breaking up into sand

What is the temperature of 0.750 mol of a gas stored in a 6,850 ml cylinder at 2.21 atm? . 2.95 k 5.24 k 138 k 246 k