Chemical Reactions Explained with 3D Molecular Models

Molecules are formed when atoms join together through chemical bonds.In water, the oxygen atom shares electrons with two hydrogen atoms, forming single covalent bonds.Carbon dioxide has a different structure, with the carbon atom forming double bonds with two oxygen atoms.Let's examine different types of chemical bonds. A single bond shares one pair of electrons.A double bond shares two pairs of electrons, making it stronger.And a triple bond shares three pairs of electrons, creating the strongest type of covalent bond.Electrons exist in orbitals around the nucleus. The s orbital is spherical.While p orbitals have a distinctive dumbbell shape.In this chemical reaction, we'll observe how bonds break and form between hydrogen and oxygen molecules.We start with hydrogen and oxygen molecules. Notice their stable bonds.As the molecules gain energy, their bonds begin to weaken. This is an endothermic process, requiring energy input.The molecules collide with sufficient energy to break their existing bonds.As new bonds form to create water molecules, energy is released in an exothermic process.The overall reaction releases more energy than it requires, making it exothermic overall.In photosynthesis, carbon dioxide and water undergo a complex reaction to produce glucose and oxygen.The process begins with six carbon dioxide molecules and six water molecules.These molecules come together in a complex series of reactions, driven by light energy.As sunlight is absorbed, the molecules gain energy and begin to break apart and recombine.The carbon dioxide and water molecules break apart and rearrange to form glucose and oxygen.As oxygen is produced, we can observe bubbles forming when this experiment is done in water.The production of glucose leads to visible changes in plant leaves, as they become darker green with more chlorophyll.This process also affects the surrounding temperature as energy is absorbed and released.