Elements, mixtures and compounds

How we can identify an element ?

By it's Characteristic properties. Physical properties : boiling point, melting point, and density. Chemical properties : Reactivity with acid.

What are common ways to Separate Mixtures ?

- Distillation - Magnet - Centrifuge

How do you broke down a compound ?

By Chemical change.

Compounds can be broken down into what two types of substance ?

Elements and simpler compounds

What is a compound ?

It's a pure substance composed of two or more elements that are chemically combined.

What are three physical properties used to identify compound ?

Melting point, density, and color.

What is a mixture ?

Mixture is a combination of two or more substance that are not chemically combined.

What a solution contains ?

Solute: is the substance that dissolved. Solvent: is the substance in which the solute is dissolved.

What is a solution ?

Solution is a mixture from 2 or more substance uniformly dispersed throughout a single phase.

What is a concentration ?

The amount of a particular substance in a given quantity of a mixture, solution, or ore.

What is a pure substance ?

A Pure Substance is a substance in which there is only one type of particle.

What is an element ?

Element is a pure substance that cannot be separated into simpler substances by physical or chemical means.

How elements join to form a compound ?

Elements join in a specific ratio according to their masses to form a compound.

What is the difference between a metal, non-metal, and metalloids ??

Metals : shiny, and they conduct heat energy and electric current. Nonmetals : they conduct heat and electricity poorly. Metalloids : elements that has properties of both metals and non-metals.

What is an alloy ?

Alloy is solid solution of metals or nonmetals dissolved in a metal.

Explain why an element is a pure substance.

An element is a pure substance because it contains only one type of particle.

What is a molecule ?

Molecule is a particle of a compound. It's formed when atoms of two or more elements join together.

Do elements have the same properties after they compound ?? Give an example.

No. Like Sodium and Chlorine, two from the most danger elements. But when they combine they form "sodium chloride" what is salt. That we use in our dally life.

Why do substance in a mixture keep their identities ?

Substance in a mixture keep their identities because no chemical change takes place when a mixture is made.

What is Solubility ?

The ability of one substance to dissolve on another at a given temperature and pressure.

Describe particles in solution.

The particles in solutions are so small that they never settle out. They also cannot be removed by filtering.