Introduction to Chemical Equations and Reactions

indicates substance is a liquid

• g

• cr

• aq

• l

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NGSS.MS-PS1-4

An ending substance that is made during a chemical reaction is called

• Reactant
• Product
• Atom
• Molecule

The starting substances of a chemical reaction is called

• products
• substances
• reactants

What are Chemical Reactions?

• It's when you mix substances.
• a process in which atoms rearrange to form new substances
• When something bubbles.
• letter and numbers showing the types and number of atoms

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NGSS.MS-PS1-2

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

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NGSS.HS-PS1-7

Describes the number of atoms in a compound of each element. 

• coefficient 
• superscript 
• subscript 
• SI unit 

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NGSS.MS-PS1-5

How many atoms in 2CaCO₃?

• 5
• 7
• 10
• 12

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NGSS.MS-PS1-1

How many atoms in 3Na(H₂O)₂?

• 10
• 14
• 21
• 27

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NGSS.MS-PS1-1

What is a precipitate?

• A solid formed from a single replacement reaction
• An aqueous compound formed from single replacement reaction 
• An aqueous compound formed from double replacement reaction
• A solid formed from a double replacement reaction

Is Fe₂O₃ an element or a compound?

• compound
• element

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NGSS.MS-PS1-1