What is a hypothesis?

• A statement summarizing experimental results

• A broad extensively tested explanation

• A possible explanation for observations

• A proven fact

Tags

NGSS.HS-LS1-6

NGSS.HS-PS1-2

NGSS.HS-PS2-5

Which of the following is NOT a theory?

• Big Bang Theory

• Theory of Evolution

• String Theory

• Law of Gravity

Tags

NGSS.HS-ESS1-2

NGSS.HS-PS2-4

Who first proposed that matter is composed of indivisible atoms?

• John Dalton

• JJ Thomson

• Democritus

• Ernest Rutherford

Which part of Dalton's atomic theory led to the law of conservation of mass?

• Atoms of the same element are identical

• Atoms cannot be created or destroyed

• Atoms of different elements are different

• Atoms combine in simple whole number ratios

Tags

NGSS.HS-PS1-7

What did JJ Thomson discover through his cathode ray tube experiment?

• Electrons

• Protons

• Neutrons

• Nucleus

What model did JJ Thomson propose for the atom?

• Plum pudding model

• Nuclear model

• Planetary model

• Quantum mechanical model

What was the main conclusion from Rutherford's gold foil experiment?

• Atoms are mostly empty space

• Atoms have a dense, positively charged nucleus

• Atoms have electrons

• Atoms are indivisible

Tags

NGSS.HS-PS1-8

Who discovered the neutron?

• James Chadwick

• Niels Bohr

• Ernest Rutherford

• Erwin Schrödinger

According to Bohr's model, where are electrons found?

• Randomly scattered

• In the nucleus

• In a dense core

• In fixed orbits around the nucleus

What is the key feature of Schrödinger's quantum mechanical model?

• Electrons' exact locations are known

• Electrons are in fixed orbits

• Electrons' probable locations are known

• Electrons are in the nucleus