Physical Chemistry

Molecules are tightly packed together

• solid
• liquid
• gas

Tags

NGSS.HS-PS1-3

A chemical change happens when...

• a substance is changed at the atomic level 
• bonds are broken and formed 
• a new substance is made
• all of the above! 

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-4

NGSS.HS-PS1-5

Which of the following reactions is a combustion reaction ? 

• MgCO3 + O2 → MgO + CO2  
• C3H8 + 5O2 → 3CO2 + 4H2O 
  
• 6CO2 + 6H2O → C6H12O6 + 6O2 
• 6CO2 + 6H2O → C6H12O6 + 6O2 

Tags

NGSS.HS-PS1-4

Anything that has mass and takes up space is called

• volume
  volume
• matter
• magnetism
• electricity

Which substance is most likely classified as a colloid?

• soft drink
• oxygen gas
• water
• fog

Which compound results from covalent bonding?

• NH₄Cl
• K₂SO₄
• NaCl
• C₆H₁₂O₆

Tags

NGSS.HS-PS1-1

Which compound will most likely be formed when lithium (Li) and nitrogen (N) are chemically combined?

• LiN
• Li₃N
• LiN₃
• Li₃N₃

What makes something radioactive?

• elements with an atomic number above 81
• an unstable nucleus
• contaminated sewage
• It decays over time

Tags

NGSS.HS-PS1-8

The process of splitting of the molecules into ions of an electrolyte is called..

• ionization

• electrolysis

• solvation

• protonation

Colour of CuSO₄ solution is

• green

• blue

• red

• yellow