Midterm Review #1

Chemical Formulas ...

• are written in alphabetical order 
• represent the destruction or creation of atoms 
• represent how atoms are arranged in a chemical reaction 

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NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A chemical change happens when...

• a substance is changed at the atomic level 
• bonds are broken and formed 
• a new substance is made
• all of the above! 

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

The compounds or elements present at the end of a reaction 

• reactants
• catalyst
• products
• energy 

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

The compounds and elements that are present at the beginning of a reaction:

• reactants
• catalyst
• products
• energy 

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NGSS.MS-PS1-1

What does a represent?

• Proton

• Neutron

• Electron

What does b represent?

• Proton

• Neutron

• Electron

What does c represent?

• Proton

• Neutron

• Electron

What is the atomic mass of this element?

• 20

• 60

• 40

• 41

What is the symbol of this element?

• Calcium

• P

• Ca

• C

protons

• negative charge, nucleus

• positive charge, shells

• positive charge , nucleus

• neutral charge, nucleus