Conservation of Matter

What does the Law of Conservation of Matter state?

• It states that mass is not created or destroyed.

• It states that mass is created and not destroyed.

• It states that mass is not created but is destroyed.

• None of the above

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NGSS.MS-PS1-5

A Chemical Equation is:

• a way to describe what happens to matter during a chemical reaction

• a representation of a chemical reaction that uses symbols and formulas.

• an accurate or balanced way to provide evidence for the law of conservation of matter.

• All of the Above

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An oreo cookie has a mass of 20 grams. It gets crushed into crumbs for a recipe. What is the mass of the crumbs?

• 15 grams

• 25 grams

• 20 grams

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If reaction starts with 20g of reactants, it will produce ---

• a total of 40g of product

• a total of 10g of product

• a total of 80 g of product

• a total of 20g of product

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How many of each type of atom are in the formula NH₃?

• 1 nitrogen, 3 hydrogen

• 3 nitrogen, 3 hydrogen

• 1 neon, 3 hydrogen

• 1 nitrogen, 3 helium

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How many molecules are represented in the formula 3CO₂?

• 3 carbon, 2 oxygen

• 6 carbon dioxide

• 3 carbon dioxide

• 3 carbon, 6 oxygen

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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-PS1-5

What will have more mass when a chemical change is complete: the reactants before the chemical reaction or the product after the reaction is complete?

• They both will have the same mass

• The product always has more mass than the reactant

• The reactant will have more mass than the product

• They both will lose mass after the reaction

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If there are 4 H atoms on the reactant side, how many H atoms will be on the product side? 

• 2
• 4
• 6
• You need more information to answer this question

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Is the equation balanced?: 2H₂O + O₂ --> 4MgO + 3Fe

• Yes
• No

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