Classify which reaction is single replacement, double replacement, decomposition

Question

Classify which reaction is single replacement, double replacement, decomposition, combination and combustion. SiO2+HF--->sIf+H2O C7H10N+O2--->CO2+H2O+NO2 KO2+CO2--->K2CO3+O2 C4H10+Cl2+O2--->CO2+CCl4+H2O Ca3p2+hH2O--->Ca(OH)2+PH3

Explanation / Answer

1. Synthesis - this involves the joining together of two simple substances to form a more complex substance. It has the form A + B --> AB ex. 2Na + Cl2 --> 2NaCl 2. Decomposition - it's when a complex substance breaks down into simpler substances (its constituents). it has the form AB --> A + B ex. 2NaCl --> 2Na + Cl2 3. Single-displacement - it's when a more active element displaces ("pushes away") another element in a compound. The one doing the displacing should be more active than the one being displaced. To know this, look at the activity series. The one on the top is the most active. Single displacement reactions have the general form A + BC --> AC + B ex. CL2 + 2 NaI -----> 2 NaCl + I2 4. Double-displacement - it's when two elements "exchange partners" with each other. It has the general form AB + CD --> AD + CB. ex. KNO3 + AgBr --> AgNO3 + KBr :)

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