Junior Cert Chemistry: Atomic Structure and Chemical Formulae

A famous scientist who put forward an atomic theory in 1808...

• Isaac Newton

• John Dalton

• Henry Moseley

• James Chadwick

Carbon is ____________

• An element

• An atom

• A molecule

• A compound

Carbon dioxide is ________________

• An element

• A compound

• A mixture

• An atom

Carbon dioxide is comprised of ___________ of carbon dioxide

• Molecules

• Atoms

• Electrons

• Neutrinos

The atoms of substance X are all the same. X must be ______________

• An element

• A mixture

• A compound

• An atom

A substance Y has atoms of different elements. Y must be _______________

• A mixture

• An element

• A compound

• A composite

Which of the following are compounds?: hydrogen, ammonia, silver, water

• Hydrogen

• Ammonia, water

• Silver, ammonia

• Water, hydrogen

The chemical formula for water is...

• H₂O

• HO₂

• HO

• H₂O₂

The smallest particle of an element which still retains the properties of that element is called ___________

• An atom

• An element

• A molecule

• A mixture

There are _____________ elements in the periodic table

• 100

• 94

• 118

• 108