What is the law of conservation of mass?

• Matter changes when reacted or changed.
• The mass of all reactants are changed during a physical or chemical change
• The mass of the reactants is the same as the mass of the products
• The mass of the products is different than the mass of the reactants.

Tags

NGSS.HS-PS1-7

What type of chemical reaction is this one?
Al(OH)₃ --> Al₂O₃  + H₂O

• Decomposition
• Combustion
• Synthesis
• Single Replacement 

What type of chemical reaction is this one?
Ca + MgCl₂ --> CaCl₂ + Mg

• Decomposition
• Combustion
• Synthesis
• Single Replacement 

Tags

NGSS.HS-PS1-2

What type of chemical reaction is this one?

Copper (II) oxide and carbon dioxide react to form copper (II) carbonate

• Decomposition
• Combustion
• Synthesis
• Single Replacement 

What type of chemical reaction is this one?
C₂H₂ + O₂ --> CO₂ + H₂O

• Decomposition
• Combustion
• Synthesis
• Single Replacement 

Balance this equation, Ca + H₂O --> CaO + H₂

• Ca + 2H₂O --> CaO + 2H₂
• 2Ca + H₂O --> CaO + H₂
• Its balanced as it is
• Cannot be balanced

Tags

NGSS.HS-PS1-7

What type of chemical reaction is this one?

Aluminum hydroxide breaks down to form aluminum oxide and water

• Decomposition
• Combustion
• Synthesis
• Single Replacement 

What type of chemical reaction is this one?

Silver oxide and nitrogen react to form silver nitrate

• Decomposition
• Combustion
• Synthesis
• Single Replacement 

What type of chemical reaction is this one? Ca + MgCl₂ --> CaCl₂ + Mg

• Decomposition
• Combustion
• Synthesis
• Single Replacement 

What coefficients are needed to correctly balance the equation?

Bismuth and oxygen gas react to form dibismuth trioxide

• 3,2,3
• 2,3,2
• 4,3,2
• none of these