Chemical Reactions and Stoichiometry

C₆H₁₂O₆ + O₂ → H₂O + CO₂

Which of the following is a reactant?

• H₂O

• CO₂

• O₂

• Mg

Tags

NGSS.MS-PS1-2

What does the Law of Conservation of Mass state?

• Matter cannot be gained or lost in a chemical reaction.
• Matter can only be lost in a chemical reaction.
• Matter can only be gained in a chemical reaction.
• Matter can be gained and lost in a chemical reaction. 

Tags

NGSS.HS-PS1-7

What is the left part of a chemical equation called?
2H_{2 +} O₂ --> 2H₂O

• Reactants
• Products 
• Yields 
• Chemical Equation 

What is the right part of a chemical equation called...
2H_{2 +} O₂ --> 2H₂O

• Reactants
• Products 
• Yields 
• Chemical Equation 

Tags

NGSS.MS-PS1-5

How many Mn atoms are found in the following compound?
3Cr(MnO₄)₆

• 3
• 4
• 6
• 18

Tags

NGSS.MS-PS1-1

Is the following equation balanced?...
Al + O₂ --> 2Al₂O₃

• Yes!
• No!

Tags

NGSS.HS-PS1-7

Is the following equation balanced?
2C₂H₂ + 5O₂ --> 4CO₂ + 2H₂O

• yes
• no

Tags

NGSS.HS-PS1-7

Which of the following equations are correctly balanced?

• 12CO₂ +H₂O --> C₆H₁₂O₆ + O₂
• CO₂ + 9H₂O --> C₆H₁₂O₆ + O₂
• CO₂ + H₂O --> 3C₆H₁₂O₆ + O₂
• 6CO₂ + 6H₂O --> C₆H₁₂O₆ + 6O₂

Tags

NGSS.HS-PS1-7

NGSS.HS-LS1-5

NGSS.HS-LS2-5

How many HCl molecules do you need to balance this equation?

1Mg + _____HCl ---> 1MgCl₂ + 1 H₂

• 1

• 2

• 3

• 4

Balance this equation.

__CF₄ + __Br₂ → __CBr₄ + __F₂

• 2,1,2,1

• 1,2,2,1

• 1,2,1,2

• 2,2,2,2

Tags

NGSS.HS-PS1-7