Law of Conservation of Mass/Counting Atoms

Uses chemical symbols and numbers to describe what happens in a chemical reaction.

• Chemical Equations

• Chemical Reactions

• Products

• Reactants

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

Occur when one or more substances are converted to one or more different substances. When this happens, we can observe chemical changes.

• Chemical Equations

• Chemical Reactions

• Products

• Reactants

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Found on the left side of the chemical equation. These are substances that react with each other to make something new.

• Chemical Equations

• Chemical reactions

• Products

• Reactants

Tags

NGSS.MS-PS1-1

It is on the right side of a chemical equation or the resulting molecules at the end of the reaction.

• Chemical Reaction

• Chemical Equation

• Reactants

• Products

Tags

NGSS.MS-PS1-1

The blue numbers in the image below represent ________. It is written after an element symbol that indicates the number of atoms of that element.

• solvents

• coefficients

• subscripts

• elements

An arrow sits between the left and the right sides of a chemical equation which means to produce or result in.

• Chemical Equation

• Yield

• Reactants

• Products

The red numbers in the image below represent ________. It is number written before a formula. If present, it indicates the number of molecules.

• Chemical formula

• Chemical equation

• Coefficient

• Subscript

Tags

NGSS.MS-PS1-5

Matter cannot be created nor destroyed during chemical reactions.

• Law of Conservation of Mass

• Law of Matter

• Law of Chemical Reactions

• Law of conservation of energy.

Tags

NGSS.MS-PS1-5

Chemical formula of water.

• H₂O

• 
• 
• H₂O₂

Tags

NGSS.MS-PS1-1

Which of the following shows the chemical equation of a photosynthesis reaction.

• 
• 
• 
• 

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3