Unit 6 Review

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

Matter can not be created nor destroyed: it can only be

• Destroyed a little bit
• Invisible
• Transformed, changed
• None of the above

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NGSS.MS-PS1-5

A chemical reaction is balanced when

• both sides have the same elements
• Both sides have the same  number of atoms
• Same subscripts
• Same coefficients

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NGSS.MS-PS1-5

The coefficient in  3H₂O is

• 6
• 2
• 3
• 5

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NGSS.MS-PS1-1

If reaction starts with 20g of reactants it should produce 

• a total of 40g of products
• a total of 10g of products
• a total of 80 g of products
• a total of 20g of products

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

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

• 4g

• 5g

• 9g

• 14g

In a synthesis reaction

• A compound breaks apart into two or more compounds
• Two or more compounds make one single product
• CO₂ and H₂O must be products
• O₂ must be a reactant

What will weigh more when a chemical change is complete?  The reactants before the chemical reaction, or the product after the reaction is complete?

• They both will weigh the same
• The product always weighs more than the reactant
• The reactant will weigh more than the product
• They both will loose mass after the reaction

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

The measure of the amount of matter is

• mass

• volume

• weight

• density

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