Chemical Reactions and Equations Test

Match the following words to their correct definitions.

• subscript

• describes the number of atoms in a molecule

• coefficient

• new substances that are created by the rearranging of atoms after a chemical reaction

• arrow

• represents a chemical reaction

• product

• the elements or compounds which exist prior to a chemical reaction

• reactant

• describes the number of molecules

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-1

Use the equation to answer the following question:

6CO₂ + 6H₂O --> C₆H₁₂O₆ + 6O₂

How many molecules of CO₂ are present in the REACTANT side?

• 5

• 1

• 6

• none

Tags

NGSS.MS-PS1-1

Use the equation to answer the following question:

6CO₂ + 6H₂O --> C₆H₁₂O₆ + 6O₂

_{There are _____ atoms of oxygen in the reactant side.}

• 6

• 18

• 12

• 24

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-1

NGSS.MS-PS1-2

Use the equation to answer the following question:

6CO₂ + 6H₂O --> C₆H₁₂O₆ + 6O₂

_{Is the above equation BALNCED or UNBALANCED?}

• BALANCED

• UNBALANCED

Tags

NGSS.MS-PS1-5

Which chemical equations are balanced? Choose the THREE correct answers.

• 2Fe + 3O₂ → Fe₂O₃

• SnO₂ + 2H₂ → Sn + 2H₂O 

• CH₄ + 2O₂ → CO₂ + 2H₂O

• NaBr + CaF₂ → NaF + CaBr₂

• 2K + MgBr₂ → 2KBr + Mg

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

 Which statement best represents the Law of Conservation of Mass?

•  Atoms can be created or destroyed, but not rearranged.

• Matter can neither be created nor destroyed.

• When atoms are rearranged, new matter is created.

• Matter can neither be created nor rearranged. 

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2