What is the Law of Conservation of Matter/Mass?

Record 2 details from the video:

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Record one thought about the Law.

I wonder (if, how, what)...

Task: Analyze and Interpret Data using a Simulation

• Find the link for the simulation on my blog.
• Part 3: choose TWO analysis questions! Include language from the language board in your responses.
• Highlight the words you use from the language board.

What is the Law of Conservation of Matter/Mass?

• It’s a law of nature that explains how/why the world works the way it does.
• Matter cannot be created or destroyed only rearranged.
• OG matter/atoms were thought to originate during the Big Bang (theory).
• “Rearranged” means combining/recombining to form different molecules, chemical reactions.

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Task: Analyze and Interpret Lab Data

• Work with partner(s). Send one person to pick up a kit.
• I will complete the procedures box for you on your handout.
• We will complete the hypothesis together.

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Why do we balance a chemical reaction?

• Studying chemical reactions and the molecules/elements involved can help make predictions about the products that will be made.
• Chemical reactions will not happen if the atoms/molecules involved don’t match….it’ the law of nature!
• Input must match output
• Coefficients:
• Numbers (in front of the atom of molecule) that tell us how many are involved in the chemical reaction. These are the only numbers that can be changed.

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Task: Analyze and Interpret Models (chart/reactions)

• I/we will do the top portion of the hand-out together
• Choose 5 unbalanced reactions to balance.
• Find the appropriate cards to lay-out the unbalanced reaction on your table.
• Use the number cards to help you balance the reactions.

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Why did the mass change? Where did it go?

• The Law of Conservation of Mattter/Mass is easiest to measure when matter is in a closed system.
• Closed system: is a physical system that doesn’t allow any exchange of matter/mass.
• Example: a sealed plastic bag
• Was our gum mass lab a closed system?
• In order to accurately collect data for the Law of Cons of Mass, we should have weighed the gum chewer and the gum before and after chewing.
• Where did the mass go?
• You digested sugars and substances in the gum.

Task: Design a Lab that proves the Law Of Conservation of Matter/Mass

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• Please do in partners to insure accurate and reliable data.
• Send one person to pick-up your lab kit from the cart.
• Complete the first 6 boxes on the front of your lab handout in order to get your baking soda. (the other chemical you will mix during the reaction)
• Your proedures must have at least 4 steps.
• See the bubble gum mass lab procedures/hand-out for help
• Maximum amounts to be mixed in order to collect reliable data
• MAX 50 mL of vinegar
• MAX 10 g of baking soda.

Part 2: Other Notes about the Law

• Sometimes in chemical reactions mass is converted to a gas and/or energy that it is released as a product.
• This gas or energy must be captured in order to prove the Law of Conservation of Mass
• Plastic bags
• Reactants used in this lab:
• Baking soda
• Vinegar
• Products in this lab:
• Sodium acetate (CH3COONa),
• water (H2O)
• carbon dioxide gas (CO2)

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How do we know the Law is true?

¨This law was developed by a French chemist named Antoine Lavoisier.

• Lavoisier carefully measured the mass of the reactants and products when carrying out chemistry experiments.
• He noticed that in every case, the mass of the reactants was ALWAYS equal to the mass of the products.

Margin of Error:

• Every lab has naturally has errors, as there are many variables that can affect the data.
• If you have a data point that does not follow the others, this is an outlier

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Task: Synthesize Information to Create a Model (chart)

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• See handout for info.
• Must use varying font sizes and colors to help clearly communicate your lab knowledge and information.
• If you would like to type your information, then draw your diagrams and data tables there is a shared link on Ms Friedrich’s blog.

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What is dark matter?

Record 2 details from the video:

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Record one thought about Dark Matter.

I wonder (if, how, what)...