Crash Course Chemistry

The Law of Conservation of Mass states

• that matter exists in all states and reacts the same
• that matter can only be changed into new substances by introducing a catalyst
• that matter exists in the same state throughout any chemical change
• that matter cannot be created or destroyed and that the mass of the products must equal the mass of the reactants

Tags

NGSS.MS-PS1-5

How many Al atoms are in this compound?         4Al₂O₃

• 2
• 8
• 6
• 4

Tags

NGSS.MS-PS1-1

How many F atoms are in this compound?
6MgF₂ 

• 2
• 6
• 8
• 12

Tags

NGSS.MS-PS1-1

Describes the number of molecules in a compound and is used to balance a chemical reaction. 

• coefficient 
• subscript
• superscript
• SI unit

Describes the number of atoms in a compound of each element. 

• coefficient 
• superscript 
• subscript 
• SI unit 

Tags

NGSS.MS-PS1-1

4Si + S₈ --> 2Si₂S₄

_{What type of reaction is this?}

• Synthesis

• Decomposition

• Single displacement

• Double displacement

3Mg + N₂ --> Mg₃N₂

_{What type of reaction is this?}

• Synthesis

• Decomposition

• Single displacement

• Combustion

Fe + H₂SO₄ --> Fe₂(SO₄)₃ + H₂

• Synthesis

• Decomposition

• Single Displacement

• Double Displacement

What type of reaction occurs between an element and a compound?

Zn + 2HCl --> ZnCl₂ + H₂

• Synthesis

• Decomposition

• Single Displacement

• Double Displacement

The reaction below is an example of?

AgNO₃ + NaCl → AgCl + NaNO₃

• Single Displacement

• Double Displacement

• Decomposition

• Decomposition