Chemistry Review Homework

The three nuclides, U-233, U-235, and U-238, are isotopes of uranium because they have the same number of protons per atom and

• the same number of electrons per atom

• the same number of neutrons per atom

• a different number of electrons per atom

• a different number of neutrons per atom

Tags

NGSS.HS-PS1-8

Which numerical setup can be used to calculate the atomic mass of gallium?

• (0.6011)(68.926 u) + (0.3989)(70.925 u)

• (60.11)(68.926 u) + (39.89)(70.925 u)

• (0.6011)(70.925 u) + (0.3989)(68.926 u)

• (60.11)(70.925 u) + (39.89)(68.926 u)

Which list of elements is arranged in order of increasing electronegativity?

• Be, Mg, Ca

• F, Cl, Br

• K, Ca, Sc

• Li, Na, K

In the formula XSO₄, the symbol X could represent the element

• Al

• Ar

• Mg

• Na

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which Lewis electron-dot diagram is correct for CO₂?

• 
• 
• 
• 

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which electron configuration represents the electrons of an atom in an excited state?

• 2-2

• 2-2-1

• 2-8

• 2-8-1

What occurs when potassium reacts with chlorine to form potassium chloride?

• Electrons are shared and the bonding is ionic.

• Electrons are shared and the bonding is covalent

• Electrons are transferred and the bonding is ionic.

• Electrons are transferred and the bonding is covalent.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

The nitrogen atoms in a molecule of N₂ share a total of

A) one pair of electrons

• one pair of electrons

• one pair of protons

• three pairs of electrons

• three pairs of protons

Which formula represents a nonpolar molecule?

• CH₄

• HCl

• H₂O

• NH₃

Which bond is most polar?

• H--F

• H--Cl

• H--Br

• H--I