Chem_5ed Chap 4 Review

What view of matter describes particles as being able to be cut in half and subdivided infinitely

• the continuous theory of matter

• atomism

• the law of definite proportion

• the law of multiple proportions

philosophical atomism can be described as the belief that matter. . .

• is made of separate, discrete particles that cannot be subdivided

• can be infintely subdivided into smaller particles

• can exist in multiple forms

• exists in a combination of some 118 possible particle types

the fact that any sample of carbon dioxide (CO₂), no matter what size the sample, will always have a mass ratio of 12g C to 32 g O is illustrated by

• The law of conservation of mass.
• The law of multiple proportions.
• The principle of atomic theory.
• The law of definite proportions.

Tags

NGSS.HS-PS1-7

Who did experimentations with compounds in order to collect data to form the law of definite proportion?

• John Dalton
• Joseph Proust
• Dmitri Mendeleev
• Albert Einstein

What did J J Thomson find to be true of atoms?

• Atoms do not contain any charged particles.
• Atoms are made entirely of protons and neutrons.
• Atoms contain smaller, negatively charged particles called electrons.

• Atoms are indivisible and cannot be broken down.

An expiriment with what kind of particle allowed Ernest Rutherford to form a new atomic model?

• gamma rays
• alpha particles
• beta particles
• neutrons

What defines an atom's atomic number?

• The number of neutrons in an atom's nucleus.
• The number of protons in an atom's nucleus.
• The total number of electrons in an atom.
• The mass of an atom's nucleus.

Rutherford's atomic model needed adjusting after the discovery of

• the photon
• the proton
• the neutron
• the electron

What symbol in atomic notation represents the number of protons in an atom?

• A
• P

• X

• Z

Tags

NGSS.HS-PS1-8

What term is used to describe atoms that generally have the same chemical properties, but different physical properties?

• Allotropes
• Compounds
• Molecules
• Isotopes

Answer explanation

The have the same chemical properties because the number of electrons and protons remains the same in different isotopes, but the physical properties are different because the varying number of neutrons changing mass