7.2.3 Modeling Conservation of Mass

Does the image represent the Law of Conservation of

• yes

• no

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The law of Conservation of Mass states

• matter can be created and destroyed

• matter takes up space

• matter cannot be created or destroyed

• matter has a new mass after a chemical reaction

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When a chemical reaction occurs...

• New molecules and atoms are formed

• Molecules and atoms are rearranged

• Molecules and atoms disappear

• Molecules and atoms are destroyed

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what is a chemical equation?

• chemical formulas and symbols are written to represent a reaction

• a chemical equation is an equation with chemicals combined into one chemical

• chemical equations represent the conservation of mass in a chemical reaction

• a dog that ate chemicals

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where are the reactants in an equation?

• The reactants are on the left side of an equation

• the reactants are on the right side of an equation

where are the products in an equation?

• The products are on the right side of the equation

• The products are on the left side of the equation

Combining substances to form new substances is called

• Chemical reaction

• Physical reaction

• Exothermic reaction

• Endothermic reaction

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The number in front of a compound or element is a 

• Subscript
• Coefficient
• Superscript
• Charge

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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Bob puts 200 grams of ice into a pitcher with 900 grams of water. He gets distracted and comes back later to find that the ice has melted in the water. How many grams of water does Bob now have in the pitcher?

• 200 g
• 700 g
• 1,100 g

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