Can u help me writing chemical equations?
To describe the chemical reactions that occur, equations of chemical reactions are compiled. In them, to the left of the equal sign (or arrow→), the formulas of reagents (substances that react) are written, and to the right — the reaction products (substances that are obtained after a chemical reaction). Since we are talking about an equation, the number of atoms in the left side of the equation must be equal to what is in the right. Therefore, after drawing up a chemical reaction scheme (recording reagents and products), coefficients are substituted to equalize the number of atoms.
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First of all, one needs to know a bit of chemistry to predict what the products of the reactions will be. Everyone probably knows the combustion of C3H6 will create CO2, but H2O is also produced, in the form of steam. Thus: C3H6 + O2 -> CO2 + H2O The equation isn’t balanced because there are not equal numbers of atoms on either side of the “->” sign. Most combustion equations start with the carbon: C3H6 + O2 -> 3CO2 + H2O Do the Hydrogen next: C3H6 + O2 -> 3CO2 + 3H2O Do the Oxygen last. However, there is an odd number of Oxygen atoms on the right side of the equation. This means: C3H6 + (4.5)O2 -> 3CO2 + 3H2O To get everything in terms of whiole numbers, multiply everything by 2: 2C3H6 + 9O2 -> 6CO2 + 6H2O ///////////////// NEXT CaO will decompose into Oxygen and Calcium: CaO -> Ca + O2 This time, balance the Oxygen first: 2CaO -> Ca + O2 The Calcium is now easy to balance: 2CaO -> 2Ca + O2 FYI: The combustion reaction is spontaneous, but the decomposition reaction is not.