Semester 1 Chemistry Review

Aluminum has _ valence electrons. 

• 7
• 1
• 6
• 3

Tags

NGSS.HS-PS1-1

As an electron moves from energy level 1 to energy level 4, is energy absorbed or released?

• Absorbed
• Released

How many protons are in an atom with an atomic number of 20, an atomic mass of 45, and a charge of +2?

• 20
• 10
• 2
• 18

Tags

NGSS.MS-PS1-1

How many electrons would an atom of Krypton, neutral charge, have?

• 83.80
• 36
• 12
• 24

Tags

NGSS.HS-PS1-1

An atom that contains 24 protons, 26 neutrons and 22 electrons would be represented by the symbol: 

• ⁵⁰V³⁺
•  ²⁶Cr²⁺  
• ⁵⁰Cr²⁺  
• None of the above

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Density is measured in:

• grams/mL
• mL/grams
• mol/liter
• psi

What particle provided the positive charge for an atom?

• proton 
• neutron
• electron
• nucleus

• Carbon
• Hydrogen
• Aluminum
• Lithium

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What charge does sodium have when it becomes an ion?

• 1+
• 2+
• 1-
• 2-

In a solid, the particles

• vibrate in place
• slide past one another