NGSS.MS-PS1-5

What are the larger numbers that you CAN CHANGE in a chemical equation? 

• Coefficient 
• Products
• Reactants
• Subscripts

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NGSS.MS-PS1-5

How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl₂ + H₂

• 1
• 2
• 3
• 4

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NGSS.MS-PS1-5

2H2O + 2N → 4H + 2NO
The chemical symbols on the RIGHT are called:

• products
• reactants
• yields/produces

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NGSS.MS-PS1-5

Theory or law?

_________ of Thermodynamics: Explains that matter can never be created or destroyed.

• Theory

• Law

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NGSS.MS-PS1-5

Which of the coefficients could be used to balance this equation?

__Ag₂O →__ Ag +___O₂

• 2,4,1

• 1,1,1

• 2,1,2

• 2,2,2

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NGSS.MS-PS1-5

Which chemical equation best represents the Law of Conservation of Mass?

• H + O → H₂O

• H₂ + O₂ → H₂O

• 2H₂ + O₂ → 2H₂O

• H₂ + O₂ → 2H₂O₂

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NGSS.MS-PS1-5

An element cannot be separated

• with an atom

• socially

• chemically

• physically

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NGSS.MS-PS1-5

So, the Law of Conservation of Mass would tell us that the mass of all the REACTANTS must __________ the mass of all PRODUCTS in a chemical reaction.

• equal

• be greater than

• be less than

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NGSS.MS-PS1-5

So... why do scientists count atoms?

• They have nothing better to do.

• They use the knowledge to mix chemicals in proper quantities for reactions.

• Because they are the count! Ah Ah Ah!!!

• They want to make toy cars.

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NGSS.MS-PS1-5

How does a balanced chemical equation satisfy the Law of Conservation of Mass?

• During a chemical reaction, the total amount of matter stays the same.

• During a chemical reaction, matter is destroyed.

• During a chemical reaction, one or more new substances are formed.

• During a chemical reaction, the total number of atoms increases.

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NGSS.MS-PS1-5