Chemistry Midterm 2018 Review

What is the approximate mass of a proton?

• 1 u
• 0.0005 u
• 1 g 
• 0.0005 g

An electron in a sodium atom gains enough energy to move from the second shell to the third shell. The sodium atom becomes...

• a positive ion
• a negative ion
• an atom in an excited state
• an atom in the ground state

Tags

NGSS.HS-PS1-2

Which particle has NO charge?

• electron
• neutron
• positron
• proton

Which quantity represents the number of protons in an atom?

• atomic number
• oxidation number
• number of neutrons
• number of valence electrons

Tags

NGSS.HS-PS1-8

The element sulfur is classified as a...

• metal
• metalloid
• nonmetal
• noble gas

Tags

NGSS.HS-PS1-1

The elements in Group 2 have similar chemical properties because each atom of these elements has the same...

• atomic number
• mass number
• number of electron shells
• number of valence electrons

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What is formed when two atoms of bromine bond together?

• a monatomic molecule
• a diatomic molecule
• a heterogeneous mixture
• a homogeneous mixture

Tags

NGSS.HS-PS1-2

Gold can be flattened into an extremely thin sheet. The malleability of gold is due to the...

• radioactive decay mode of the isotope Au-198
• proton-to-neutron ratio in an atom of gold
• nature of the bonds between gold atoms
• reactivity of gold atoms

Tags

NGSS.HS-PS1-3

Which term represents the attraction one atom has for the electrons in a bond with another atom?

• electronegativity
• electrical conductivity
• first ionization energy
• mechanical energy

Salt water is classified as a...

• compound because the proportion of its atoms is fixed
• compound because the proportion of its atoms can vary
• mixture because the proportion of its atoms is fixed
• mixture because the proportion of its atoms can vary

Tags

NGSS.MS-PS1-1