Chapter 11 Chemical Quantities

What kind of reaction is this:
4Fe  +  3O₂ →   2Fe₂O₃ 

• Synthesis
• Decomposition
• Single Replacement 
• Double Replacement

What kind of reaction is this:
2C₃H₇OH +9O₂ -> 6CO₂ + 8H₂O

• Double Replacement
• Combustion
• Single Replacement
• Decomposition

What kind of reaction is this:
Fe + CuSO₄ -> Cu + FeSO₄

• Double Replacement
• Decompostion
• Single Replacement
• Combustion

What type of chemical reaction is this?
Al(OH)₃ → Al₂O₃  + H₂O

• Decomposition
• Combustion
• Synthesis
• Single Replacement 

What is the arrow in a chemical equation...
H_{2 +} O --> H₂O

• Reactants
• Products 
• Yields 
• Chemical Equation 

Evidence of a chemical reactions is anything that shows - 

• a new substance has formed
• a solid dissolved in a liquid
• interaction between 2 gases
• a change in the state of matter

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

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

Tags

NGSS.HS-PS1-7

The blue numbers in the image below represent ________

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

The Law of Conservation of Mass states

• that matter exists in all states and reacts the same

• that matter can only be changed into new substances by introducing a catalyst

• that matter exists in the same state throughout any chemical change

• that matter cannot be created or destroyed and that the mass of the products must equal the mass of the reactants

Tags

NGSS.HS-PS1-7

Why must chemical equations be balanced?

• So that the equation doesn't explode

• The reaction won't happen until it is balanced

• Based on the Law of Conservation of Matter, matter cannot be created or destroyed.

• Based on the Law of Conservation of Energy, energy cannot be created or destroyed.e

Tags

NGSS.HS-PS1-7