Transcript in English from Video: Elements: An element is a substance composed of the same type of atoms.
Compound: A compound is a substance made of more than 1 type of atom.
Atom: the basic unit of a chemical element.
Chemical Bond: The physical phenomenon of chemical substances being held together by attraction of atoms to each other through sharing, exchanging of electrons or electrostatic forces.
Ionic Bond: The complete transfer of valence electrons between atoms through two oppositely charged ions.
Covalent Bond: A chemical bond formed when electrons are shared between two atoms. Usually each atom contributes one electron from a pair of electrons that are shared by both atoms.
Examples of Elements
Element
Helium (He) - Used in party balloons
Oxygen (O) - Needed for humans to breathe
Fluoride (F) - Cleaning agent in toothpaste
Examples of Compounds
Compound
Water (H2O) - Need to drink in order to survive
Salt (NaCl) - Used for flavoring and preserving foods
Carbon Dioxide (CO2) - Needed for plants to breathe
Representation
Element
An element is represented using symbols
Ex: Au - Gold
Compound
A compound is represented using a formula
Ex: NaHCO3 - Sodium Bicarbonate
Differences Between Elements & Compounds
Elements and Compounds are pure chemical substances found in nature. The difference between an element and a compound is that an element is a substance made of the same types of atoms (Ex: Iron Fe & Copper Cu), where as a compound is made of different elements of definite proportions (Ex: Water H2O & Citric Acid C6H8O7)
Distinguishing Feature
Element
Are distinguished by their atomic number
All elements are shown on the periodic table
Compound
Contain different elements in a fixed ratio arranged in a defined manner through chemical bonds
Ability To Break Down
Element
An element cannot be broken down into simpler substances by chemical reactions
Compound
A compound can be separated into simpler substances by chemical reactions
0 Comments