Chemistry Ch. 3

Every sample of table salt has the same proportions of ions.

As a result, every sample of table salt has the same formula, NaCl.

What law does this illustrate?

• law of definite proportions

• law of conservation of mass

• law of multiple proportions

What law of atomic theory does this describe?

• law of definite proportions

• law of conservation of mass

• law of multiple proportions

What law of atomic theory does this describe?

• law of definite proportions

• law of conservation of mass

• law of multiple proportions

the law that states that mass cannot be created or destroyed in ordinary chemical and physical changes

• law of definite proportions

• law of conservation of mass

• law of multiple proportions

the law that states that when two elements combine to form two or more compounds, the mass of one element that combines with a given mass of the other is in the ratio of small whole numbers

• law of definite proportions

• law of conservation of mass

• law of multiple proportions

A ____________ is a pure substance composed of atoms

of two or more elements that are chemically combined.

• atom

• molecule

• element

• compound

What is Atomic Theory?

• all atoms are created equal

• atoms are the building blocks of all matter

• atoms can be measured qualitatively

• atoms are non-living

The 3 most important subatomic particles of an atom are the

P__________

N__________

E__________

Subatomic particles with mass and a negative charge are_________

• protons

• neutrons

• electrons

The dense, central portion of the atom. It has all of the positive charge,

nearly all of the mass, but only a very small fraction of the volume of the atom.

• protons

• neutrons

• electrons

• nucleus