Review quiz balancing and types of Chem reactions 11 mins

The Law of Conservation of Mass says:

• Matter can be destroyed, but it can't be created.

• Matter can be created with any density as long as the volume remains constant.

• Matter cannot be created nor destroyed.

• Matter can change phases and still be the same substance.

H₃PO_{4 +} KOH ------> K₃PO₄ + H₂O

Is this equation balanced?

• yes

• no

• impossible to determine

Choose the Answer that shows this equation balanced:

Na + O₂ ----> Na₂O₂

• Na + 3O₂ ----> Na₂O₂

• 2Na + O₂ ----> Na₂O₂

• Na + 2O₂ ----> Na₂O₂

• 3Na + 2O₂ ----> Na₂O₂

According to the Law of Conservation of Mass (Matter), Matter cannot be ​ (a)   or ​ (b)   , it can only be ​ (c)   . This means however many atoms of an element we have before a reaction must be ​ (d)   to the number after a reaction.

• created
• destroyed
• changed
• equal

KClO₃ --> KCl + O₂
What coefficient would go in front of KCl?

• 1
• 2
• 3
• 4

BaF₂ + K3PO₄ --> Ba₃(PO₄)₂ + KF
What coefficient goes in front of K₃PO₄?

• 1
• 2
• 3
• 4

A + B = AB

• Double Replacement
• Synthesis
• Combustion
• Decomposition

Name this reaction:  2Ca + O₂ --> 2CaO

• Decomposition
• Synthesis
• Double Replacement
• Combustion

____ P₄ + ____ O₂ --->____ P₂O₃

• 1,3,2
• 1,1,1
• 1,2,3
• 2,1,2

Which type of reaction is:
2 NaBr + Ca(OH)₂ → CaBr₂ + 2 NaOH

• Synthesis
• Single Displacement
• Double Displacement
• Combustion