Chemical Reaction l

Endothermic- Require heat for the reaction occur

In an exothermic reaction, the total energy of the products is less than the total energy of the reactants. Therefore, the change in enthalpy is negative, and heat is released to the surroundings

1) Photosynthesis: Plants absorb heat energy from sunlight to convert carbon dioxide and water into glucose and oxygen.

2)Cooking an egg: Heat energy is absorbed from the pan to cook the egg

Exothermic - Repels heat

Endothermic reactions are reactions that require external energy, usually in the form of heat, for the reaction to proceed. Since endothermic reactions draw in heat from their surroundings, they tend to cause their environments to cool down. They are also generally non-spontaneous, since endothermic reactions yield products that are higher in energy than the reactants

Example of Exothermic =Combustion: The burning of carbon-containing compounds uses oxygen, from air, and produces carbon dioxide, water, and lots of heat.
Rain: Condensation of water vapor into rain releasing energy in the form of heat is an example of an exothermic process.

https://www.youtube.com/watch?v=eJXL0IrbtqE

Single-Replacement reactions: A more active metal displaces a less active metal in a compound

A + BX = B + AX

Double-Replacement reactions: A partner-swapping reaction
AX + BY = BX + AY

Decomposition reactions:A reaction to break down things
A = B+ C

Take 1 reactant and make many products

Combustion Reaction: To combine things Take many reactants and make 1 product

A + B = C

Steps To Balance Equations

Write Down Number of Atoms
Add Coefficients To Balance Mass in a Chemical Equation
Balance Oxygen and Hydrogen Atoms Last

For any chemical equation (in a closed system) the mass of the reactants must be equal to the mass of the products.

Videos on How to Balance Reactions