Short Answer 1. Ammonium nitrate NH4NO3 is a white solid that releases nitrogen gas and oxygen gas when it is
heated. The clear liquid that remains is water. (a) Write a word equation for this reaction, labelling
the reactants and products. (b) When 2.5 g of ammonium nitrate is heated, the mass of combined
nitrogen gas and oxygen gas released is 1.0 g. What is the final mass of the water that remains? (c)
What type of reaction would this be? Explain your choice. (5 Marks)

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"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."

c-14 is carbon-14, or radiocarbon.   it is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons.

i think it's letter a.