Counting Atoms and Balancing Equations and Conservation of Mass

The number in front of a compound or element is a 

• Subscript
• Coefficient
• Superscript
• Charge

Is this equation balanced?

• yes
• no
• Not enough information

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Is this equation balanced?

• yes
• no
• Not enough information

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is the Law of Conservation of mass?

• Mass is created in a chemical reaction
• Mass is created in a physical change
• New chemicals formed from a chemical reaction have a larger overall mass than the original reactants
• Mass is never created or destroyed

Tags

NGSS.MS-PS1-5

Anything that has mass & takes up space

• gravity
• force
• matter
• volume

Tags

NGSS.MS-PS1-5

Substance that cannot be broken into simpler substances

• element
• molecule
• gram
• proton

Substance made up of chemically combined elements

• atom
• element
• electron
• compound

Tags

NGSS.MS-PS1-1

Number written below & to the right of a chemical symbol

• subscript
• reactant
• product
• coefficient

Substances that form as the result of a chemical reaction

• products
• reactants
• coefficients
• subscripts

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Substances present at the start of a chemical reaction

• subscripts
• coefficients
• reactants
• products