Chapter 4- Elements, Compounds and Mixtures

Atom

The smallest particle of an element that has the same chemical properties as that element /monoatomic element.

Chemical symbols

Used to represent elements.

Molecule

Group of two or more atoms that are chemically combined together.

Mixtures

Two or more substances that are not chemically combined and are in an unfixed ratio.

Chemical reactions

They take place when a mixture is formed and there is little or no energy change.

Elements

A pure substance made of atoms that cannot be broken down into simpler substances by chemical processes.

Oxygen atom

________ is written at the end of the formula.

chemical formulae

Some ________ contain brackets if the number of atoms is common and the compound contains more than two elements.DIFFERENCES BETWEEN COMPOUNDS AND MIXTURES.

Chemical reactions

________ take place when a compound is formed and there is energy change.

Lusturous

Shiny appearance of metals.

Conductors

Material that transmits heat or electricity, especially when regarded in terms of its capacity to do so.

Insulators

A substance which does not readily conduct electricity or heat.

Malleable

Able to be hammered or pressed into shape without breaking or cracking.

Ductile

Able to be deformed without losing toughness.