We are going to write a blog about some concepts of science. We would include the pure substances, mixtures, states of matter and change of state

Pure Substances:

Atoms: is a basic unit of matter that consists of a dense central nucleus surrounded by a cloud of negatively charged electrons. 

Elements: one or more of the same kinds of atoms chemically combined.

Compound: is a pure chemical substances consisting of two or more different chemical elements.

Mixture: is a material system made up of two or more different substances which are mixed but are not combined chemically. A mixture refers to the physical combination of two or more substances on which the identities are retained and are mixed in the form of alloys,solutions, suspensions , and colloids.

finishing

Pure substance: A substance that has definite physical and chemical properties

Heterogeneus mixture: One that does´t have a uniform composition

Homogeneus mixture: Have a uniform composition

Suspensions: is a heterogeneous mixture containing solid particles that are sufficiently large for sedimentation. 

Solutions: Solution is a homogeneus mixture composed of only one phase. In such a mixture, a solute is a substance dissolved in another substance, known as a solvent.

Colloids: Is a substance microscopically dispersed throughout another substance.

Lesson 5

Solid: Sustance that has a definite shape and volume.

Liquid: Substance that has a definite volume but not a definite shape.

Gas: Doen´t has a definite volume or shape.

Melting:Process which a solid becomes a liquid


Freezing: Liquid to become a solid.

Condensation: Reverse of evaporation.
Sublimation:Change from a solid state directly into a gas 
Deposition: Change in state from a gas directly to a solid