The document discusses different types of chemical reactions: combination reactions where two or more reactants combine to form a single product, decomposition reactions where a single reactant breaks down into simpler products, single displacement reactions where a reactant can replace an atom of a compound, and double displacement reactions where ions are exchanged between two reactants to form new compounds. General equations and examples are provided for each type of reaction. The document also notes that being in love is just a chemical reaction in the brain, not related to feelings of the heart.
19. A REACTION WHEN TWO OR MORE ELEMENTS COMBINE TO
FORM A SINGLE PRODUCT
A + B AB
Na + Cl
General
Equation
NaCl
20. A SINGLE REACTANT BREAKS DOWN INTO SIMPLER
ONES. IT IS THE OPPOSITE OF COMBINATION
REACTION
AB A + B
General
equation
NaCl Na + Cl
21. A SUBSTANCE, IT CAN BE ELEMENT OR A COMPOUND;
CAPABLE OF REPLACING ONE OF THE ATOMS OF A GIVEN
COMPOUND
AB + C AC + B
General
equation
KBr + Cl KCl + Br
22. A REACTION IN WHICH IONS GET EXCHANGED BETWEEN TWO
REACTANTS, RESULTING OF A NEW COMPOUND
AB + CD AC + BD
General
equation
AgNO + MgCl AgCl + MgNO
