crash course # 1

Who is the speaker in the introduction of the document?

• Hank Green

• Albert Einstein

• Robert Brown

• Isaac Newton

What is chemistry described as in the document?

• A bridge between biology and physics

• A form of art

• A type of philosophy

• A branch of mathematics

Who mathematically proved the existence of atoms and molecules in 1905?

• Albert Einstein

• Isaac Newton

• Niels Bohr

• Marie Curie

What year did Einstein theorize the cause of Brownian motion?

• 1905

• 1827

• 1915

• 1895

What is the origin of the word "atom"?

• Latin for "small"

• Greek for "indivisible"

• French for "tiny"

• German for "particle"

What percentage of silver has 60 neutrons?

• 48%

• 52%

• 60%

• 62%

What are isotopes?

• Atoms with the same number of protons but different numbers of neutrons

• Atoms with different numbers of protons and neutrons

• Atoms with the same mass number

• Atoms with different chemical properties

What is the mass number of silver-107?

• 105

• 107

• 109

• 111

What does the mass number represent?

• The number of protons in an atom

• The number of electrons in an atom

• The total number of nucleons in the nucleus

• The atomic number of an element

What stabilizes nuclei according to the text?

• Electrons

• Protons

• Neutrons

• Isotopes