Chemical reactions/ Motion and Forces

The Law of Conservation of Mass states

• that matter exists in all states and reacts the same
• that matter can only be changed into new substances by introducing a catalyst
• that matter exists in the same state throughout any chemical change
• that matter cannot be created or destroyed and that the mass of the products must equal the mass of the reactants

Tags

NGSS.MS-PS1-5

How many Al atoms are in this compound?         4Al₂O₃

• 2
• 8
• 6
• 4

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NGSS.MS-PS1-1

An gel ice pack getting cold after you put it in the freezer for an hour.

• Chemical Change
• Physical Change

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NGSS.MS-PS1-4

NGSS.MS-PS3-4

___________________ are the elements are compounds that leave (are formed in) a chemical
reaction.

• Polymers
• Bonds
• Reactants
• Products

Tags

NGSS.MS-PS1-5

Describes the number of molecules in a compound and is used to balance a chemical reaction. 

• coefficient 
• subscript
• superscript
• SI unit

Tags

NGSS.MS-PS1-5

True or False
In a chemical reaction, no new atoms are created, and no atoms are destroyed. 

• true
• false

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NGSS.MS-PS1-5

The left side of the equation below is called

• Products
• Reactants

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NGSS.MS-PS1-1

NGSS.MS-PS1-2

The right side of the equation below is called the

• products
• reactants

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

A chemical reaction that absorbs heat

• Single replacement
• Exothermic
• Endothermic
• Decomposition

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NGSS.MS-PS1-4

NGSS.MS-PS1-6

NGSS.MS-PS3-4

Some chemical reactions require a substance called a catalyst. The purpose of a catalyst is

• to warm up the reaction

• to speed up the reaction

• to create more reactants

• to stop the reaction

Tags

NGSS.MS-PS1-2