Please enable JavaScript.
Coggle requires JavaScript to display documents.
Elements, Compounds, Substances and Mixtures - Coggle Diagram
Elements, Compounds, Substances and Mixtures
-
Compounds
-
-
compounds do not necessarily look like the elements that formed it, they are entirely new materials.
Substances
-
It is matter that is characterized by a constant composition in terms of its molecules, formulae and atoms.
-
It can also be matter that exists in its pure form, usually called a pure substance.
examples of chemical substances seen in pure form are salt (sodium chloride), diamond (carbon) and gold.
-
Mixtures
-
the parts can be separated from each other by physical means, because it does not involve bonds.
Types of Mixtures
Homogeneous mixture:
When a sample of matter has the same composition throughout, we call that substance a homogeneous substance.
example: A piece of gold will also have the same chemical composition, making it a homogenous substance.
Homogeneous Mixtures behave in a similar way, the substance formed appear to have the same chemical composition.
-
Separating mixtures
-
Filtration
-
Filtration is used in water treatment plants, where water from rivers is filtered to remove solid particles.
Evaporation
-
The process involves heating the solution until the solvent evaporates leaving behind the solid residue.
-
-
-
Separating funnel
two liquids that do not dissolve very well in each other can be separated by taking advantage of their unequal density.
Chemical Formulae
many elements and compounds that are represented by letters and numbers. These symbols are written in a definite way to tell us what the elements and compounds are made up of. They also tell us the various amounts of atoms in any substance.
. For example — Fe stands for Iron, O stands for Oxygen and C stands for carbon. It is very important to know the correct symbols of all the elements, because if they are not written properly, they change the entire meaning of it.
The small numbers below the symbols tell us how many atoms of that element are in the molecule. 'O' means one atom of oxygen. h2 means 2 atoms of hydrogen. symbol for water, means two atoms of Hydrogen and one atom of oxygen. This is a water molecule.
-
-