Chemistry Midterm Review

All chemicals in the lab are to be considered dangerous.

• True

• False

Which subatomic particles are found inside the nucleus of an atom?

• Protons and neutrons

• Neutrons and electrons

• Electrons and protons

Tags

NGSS.HS-PS1-8

A(n) __________ is the smallest unit of an element that retains properties of its element.

• Molecule

• Atom

• Nucleus

• Proton

Is wax melting a chemical or physical change?

• Chemical change

• Physical change

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

A period on the periodic table would describe a __________ and it tells us ____________________________.

• Column; number of valence electrons

• Column; number of energy levels

• Row; number of valence electrons

• Row; number of energy levels

Tags

NGSS.HS-PS1-1

The ____________ determines the number of valence electrons.

• Atomic mass

• Atomic number

• Group

• Period

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

If an atom were to lose an electron, its charge would be...

• 0 or neutral

• +1

• -1

An atom of Sulfur (S)

• Gains two electrons and becomes a cation

• Gains two electrons and becomes an anion

• Loses two electrons and becomes a cation

• Loses two electrons and becomes an anion

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

CH4 - Is this compound ionic or covalent?

• Ionic

• Covalent

Tags

NGSS.HS-PS1-3

What is the noble gas electron configuration for Br?

• [Ar]4s²3d¹⁰4p⁶5s²4d¹⁰5p⁶

• [Ar]4s²4d¹⁰4p⁶5s²5d¹⁰5p⁵

• [Kr]5s²4d¹⁰5p⁵

• [Ar]4s²3d¹⁰4p5

Tags

NGSS.HS-PS1-1