Chemistry Final Review

A _____________ is matter that has a uniform and unchanging composition.

• atom

• substance

• element

• compound

Select two elements on the periodic table that are liquids at room temperature.

• iron

• bromine

• mercury

• helium

Tags

NGSS.MS-PS1-4

What is the state change in which a solid becomes a liquid?

• melting

• freezing

• sublimation

• condensation

Tags

NGSS.MS-PS1-4

What is a chemical composition of two or more different elements joined together in fixed proportions?

• element

• atom

• compound

• mixture

Tags

NGSS.MS-PS1-1

How many neutrons does the isotope of lithium have?

• 8
• 3
• 4
• 5

Tags

NGSS.MS-PS1-1

What is Neils Bohr's contribution to the atomic theory?

• Created the atomic theory

• Created a model of the atom with electrons moving around the nucleus in a fixed orbits

• Discovered that the proton had a positive charge

• Believed that atoms of a given element are identical

• Discovered the electron

Tags

NGSS.MS-PS1-1

What was Ernest Rutherford's contributions to atomic theory?

• Discovered the nucleus- did the gold foil experiment

• Used the cathode ray tube in his discovery

• Discovered the electron

• Discovered the neutron

Tags

NGSS.HS-PS1-8

Who discovered electrons using a cathode ray tube?

• Rutherford

• Bohr

• J.J. Thompson

• Democritus

Which scientist carrying out which experiment led to the discovery that the charge on an electron is 1.602 × 10−191.602 × 10-19 coulombs?

• Rutherford, gold foil experiment

• Democritus, experiments showing the atom is indivisible

• Millikan, oil-drop experiment

• Crookes, accidental discovery of cathode ray

Which particles account for the mass differences among isotopes of the same element?

• electrons

• protons

• atoms

• neutrons