Calculate the enthalpy change, ∆Hrxn, for each sub-reaction in terms of kJ/mol. Remember that the sign of q from the calorimeter represents the surroundings (+) and q from the reaction represents the system (−).

Sally is making a model of a magnesium atom with an atomic mass number of 24 for her chemistry class. she has foam balls for the protons, neutrons, and electrons. she has added 6 neutrons to her model so far. how many more neutrons does she need to add to complete her neutral atom of magnesium?

When the speed of the bottle is 2 m/s, the average maximum height of the beanbag is m.

The sum of the oxidation numbers in a neutral compound is always