Chemistry Final Exam 2024

Which of the following is described as the basic unit of matter?

• Element
• Atom
• Molecule
• Compound

A molecule is________

• two ions held together by opposite charges
• smaller than an atom
• can be physically separated into smaller atoms
• more than one atom bonded together by covalent bonds

Tags

NGSS.MS-PS1-1

Mercury

• Na

• Hg

• Pb

• He

Tags

NGSS.HS-PS1-1

What's the chemical formula for salt (Sodium Chloride)?

• H₂O
• CO₂
• NaCl
• O₂

Tags

NGSS.MS-PS1-1

The Law of Conservation of Mass states that

• compounds and elements are the same

• elements can be destroyed

• matter cannot be created or destroyed, but can be transformed

• mass is the same for all the objects if they need to exist

Tags

NGSS.HS-PS1-7

What is the name of the compound whose formula is N₂O₅

• Nitrogen oxide

• Dinitrogen pentoxide

• Pentanitrogen dioxide

• Dinitrogen oxide

Pb(NO₃)₂  +  KI --> PbI₂ + KNO₃
What type of reaction is this? 

• Synthesis 
• Decomposition 
• Single Replacement
• Double Replacement 

Which equation is balanced?

• PbO₂ + 2H₂

• SO₂ + H₂0 --> H₂SO₄

• 2Na + 2H₂O --> 2NaOH + H₂

Tags

NGSS.HS-PS1-7

An insoluble solid produced by a chemical reaction in solution is called

• a precipitate

• a molecule

• a reactant

• the mass of the product

Tags

NGSS.MS-PS1-2

Which of the follwoing forms a diatomic molecule as an element?

• chlorine

• nitrogen

• hydrogen

• all of the above

Tags

NGSS.MS-PS1-1