For the best answers, search on this site shorturl.im/avy6gThe triangle is actually the Greek letter delta which signifies change. A chemical equation will often have a delta H value listed with it, indicating the change in enthalpy for the reaction. 2. When balancing an equation, its generally best to handle the lone species (Cr and Fe in this case) last as you can easily manipulate their values to suit the rest of the equation as necessary. So you would first balance the nitrates by putting a 3 in front of the iron(II) nitrate and a 2 in front of the chromium(III) nitrate. This means you now need to account for the 2 moles of Cr in the product side by putting a 2 in front of the Cr. Likewise, as 3 moles of Fe were present in the reactant side, to balance the equation you would put a 3 in front of the Fe. Therefore your answer would be 2, 3, 3, 2. 3. This type of reaction simply entails exchanging ions and balancing charges. Rb and OH have +1 and -1 charges, respectively. PO4 has a -3 charge. Depending on the relative concentrations of the reactants you may achieve complete neutralization or generate acid-salts. Assuming the reaction goes to completion, you would end up with H2O and Rb3(PO4). As there are 3 moles of Rb present in the products, we would put a 3 in front of the RbOH on the reactant side to balance the Rb. Counting H’s, we realize we have 6 on the reactant side but only 2 on the product side, so we also place a 3 in front of the H2O. The O’s and the PO4 are now balanced, as well. Hence the stoichiometric coefficients would be 3, 1, 3, 1. 4. A combustion reaction refers to a substance being burned in oxygen so that can be ruled out immediately. A single-replacement reaction, as the name suggests, would involve one substance replacing another, which clearly isn’t happening here. A decomposition reaction, which is also fairly aptly named, involves a substance being decomposed. Which means broken down. Again this is clearly not the case. Thus, by simple process of elimination, this is a combination reaction. A combination reaction typically involves, quite shockingly, combination of atoms....
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