Chemical Reactions and Balancing

___C₃H₈ +___O₂ --> ___CO₂ + ___H₂O

• 1,5,3,4
• 2,10,6,8
• already balanced
• 1,5,5,4

Tags

NGSS.HS-PS1-7

__Na + __Cl₂ --> __NaCl

• 1,1,2
• 2,1,2
• 2,1,1
• already balanced

Tags

NGSS.MS-PS1-5

__H₂O + __CO₂ --> __C₇H₈ + __O₂

• 4,7,1,9
• 4,7,1,7
• 2,3,1,3
• already balanced

Tags

NGSS.HS-PS1-7

How many total atoms are represented?         4Al₂O₃

• 2
• 8
• 5
• 20

Tags

NGSS.MS-PS1-1

A + B → AB : is the general form for which reaction type?

• Double Replacement
• Synthesis
• Combustion
• Decomposition

Identify this type of reaction,
Cl₂ + 2KI _-->  I₂ + 2KCl

• Synthesis
• Single Replacement
• Double Replacement
• Decomposition

Which of the following is an example of synthesis?

• Na + Br₂ --> NaBr
• KClO₃ --> KCl + O₂
• HgO + Cl₂-->HgCl + O₂
• Cl₂ + NaBr --> NaCl + Br₂

Which reaction type is the following:  Na + CaF₂ --> Ca + NaF

• Decomposition
• Single Replacement
• Synthesis
• Double Replacement

Balance this reaction:

____ NaF + ____ Br₂ ---> ___ NaBr + ____ F₂

• 3,1,2,1

• 1,2,3,4

• 2,1,2,1

• 1,2,1,2

The red numbers in the image below represent ________

• subscripts
• coefficients
• I don't know, and don't want to try
• None of the answers are correct