Balancing Equations & Conservation of Mass Quiz Review

The number in front of a compound or element is a 

• Subscript
• Coefficient
• Superscript
• Charge

What is the Law of Conservation of mass?

• Mass is created in a chemical reaction
• Mass is created in a physical change
• New chemicals formed from a chemical reaction have a larger overall mass than the original reactants
• Mass is never created or destroyed

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

How many iron atoms are in 
Fe(NO₃)₂

• 1
• 2
• 3
• 6

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NGSS.MS-PS1-1

Is this chemical equation balanced?
2Na + Cl₂ ----> 2NaCl

• Yes
• No

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NGSS.MS-PS1-5

Balance this equation:
MgCl₂ --> Mg₄+ Cl₂

• It's already balanced.
• 4MgCl₂ --> Mg₄+ 4Cl₂
• 4MgCl₂ --> Mg₄+ 5Cl₂

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NGSS.MS-PS1-5

 Mg  +  ___ HCl  →   MgCl₂  +   H₂

• 1
• 2
• 3
• 4

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

An oreo cookie weighs 20 grams.  It gets crushed into crumbs for a recipe.  How much do its crumbs weigh?

• 15 grams
• 25 grams
• 20 grams

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NGSS.HS-PS1-7

In a reaction A + B ----> C,  reactant A has 5g and product  C has 9g. How many grams does reactant B should have? 

• 4g
• 5g
• 9g
• 14g

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

In a chemical reaction, 4 grams of sodium must combine with how many grams of chlorine to produce 10 grams of table salt?

• 4 grams

• 6 grams

• 8 grams

• 10 grams

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NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

PCl₅ + ___ H₂O → ___ HCl + H₃PO₄

• 4, 5

• 1, 6

• 3, 8

• 2,2

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NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5