Is pure air an element or a compound?

Which of the following statements is TRUE? A. Endothermic processes decrease the entropy of the surroundings, at constant T and P. B. Endothermic processes are never spontaneous. C. Entropy is not a state function. D.

What is the PH of a solution whose [H+] is 0.0007

How can you explain why greasy substances are difficult to wash off?

How much uranium was used in the first atomic bomb?

The volume of carbon dioxide, CO2, gas created in the reaction below at STP occupies 66 L. How many kilojoules are released in the reaction that produces this quantity of CO2? HCl (aq) + NaHCO3 (s) → H2O (l) + NaCl (s) + CO2 (g) + 70kJ

Which metal will spontaneously react with Zn2+ (aq), but will not spontaneously react with Mg2+ (aq) according to the activity series

How liquid in a thermometer changes so that it can be used to measure temperature

Why do some elements react easily but others dont?

1. What is an isomer? How many possible isomers of hexane are there? What are the structural differences between these isomers?

An ion of oxygen contains eight protons and has a charge of 2-. What must occur for this ion to become a neutral oxygen atom? Group of answer choices It must lose two electrons. It must gain two protons. It must gain two electrons.