atoms,elements and compounds

What is an atom

Smallest particle of an element

What is an element?

A substance made of only one type of atom

What is a compound?

2 or more elements chemically combined

Why cant elements be broken down chemically

Because they contain only one type of atom

What is a molecule?

two or more atoms joined together

How are compounds different from mixtures

Compounds are chemically bonded, mixtures are not

What determines the properties of an element

The type of atoms it contains

Why do elements have different properties

Because they contain different atoms

What are physical properties?

Characteristics that can be observed without chemical change

What are chemical properties?

how a substance reacts with other substances

What are metals?

Elements that conduct heat and electricity well

What are typical properties of metals

Conductive,shiny,strong,malleable

What does malleable mean?

can be hammered into shape

What does ductile mean

can be drawn into wires

Why do metals conduct electricity?

Because they have free moving electrons

What are molecular elements

Elements made of molecules instead of single atoms

Give examples of molecular elements

Oxygen(O2),Hydrogen(H2),Nitrogen (N2)

Why are molecular elements stable

Atoms bond together to form stable molecules

What are common metallic elements

Iron,copper,aluminium

What are common non-metals

Oxygen,carbon,hydrogen

What is the periodic table

A table showing all elements arranged by properties

How are compounds formed

When elements chemically react and bond

Why do compounds have different properties from elements

Because atoms rearrange during chemical reactions

Give an example of compound formation

Hydrogen+Oxygen➡️water

What is a chemical bond

Force holding atoms together

What is a chemical formula

Shows the elements in a compound and their ratios

What does H2O mean

2 hydrogen atoms and 1 oxygen atom

What does CO2 mean

1 carbon atom and 2 oxygen atoms

What do numbers in formulas represent

Number of atoms

What is a compound name

Name describing elements in a compound

What does oxide mean

Compound containing oxygen

Example of oxide

Carbon dioxide

What does chloride mean

Compound containing chlorine

What happens during a chemical reaction

Atoms rearrange to form new substances

Are atoms destroyed in chemical reactions

No they are rearranged

What is conserved in chemical reactions

mass is conserved, energy is transferred but overall conserved

Why is mass conserved

Because atoms are not created or destroyed