Conservation of Mass

What is the definition of chemical reaction?

• The input which reacts chemically to create product
• a system where none of the reactants or products are allowed to escape
• occurs when the atoms and molecules of two or more substances rearrange to form new substances
• the output, or result of a chemical reaction

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What is a reactant in a chemical equation?

• The input which reacts chemically to create product
• the output, or result of a chemical reaction
• a small molecule that makes up one part of a polymer
• compounds made of thousands of repeating smaller molecules

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What is a product in a chemical reaction?

• the output, or result of a chemical reaction
• occurs when the atoms and molecules of two or more substances rearrange to form new substances
• a small molecule that makes up one part of a polymer
• The input which reacts chemically to create product

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Fill in the blank:
The law of conservation of mass states that matter cannot be created nor __________________.

• destroyed
• rearranged
• transferred
• changed

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Fill in the blank:
A __________________ chemical equation shows that the same number of atoms in the reactants are also in the product.

• balanced
• transferred
• rearranged
• beautiful

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Fill in the blank:
It is best to observe the law of conservation of mass in a _____________________ because it will ensure that the mass is the same in the beginning and end of a chemical reaction.

• closed
• open
• balanced
• rearranged

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In a closed system, a chemical reaction takes place.  The mass of the reactants in the beginning of the reaction is 25g.  What does the mass have to be in the end of the reaction in order to follow the law of conservation of mass?

• 25g
• You can't tell with the given information.
• 30g
• 15g

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In a chemical reaction, the mass of the reactants was 15g.  The mass of the products was 12g.  Did this chemical reaction follow the law of conservation of mass?

• Yes 
• No
• You can't tell with the given infomation 

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The following chemical reaction occurs:
2S + 3O₂ -> 2SO_{3
How many atoms of oxygen are there in the reactant?}

• 2 atoms of oxygen
• 3 atoms of oxygen
• 6 atoms of oxygen
• 1 atom of oxygen

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The following chemical reaction occurs:
N₂ + 3 H_{2 ->} 2 NH₃
How many atoms of hydrogen are there in the product?

• 3 atoms of hydrogen
• 2 atoms of hydrogen
• 6 atoms of hydrogen
• 1 atom of hydrogen

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