Thursday 3/14/24 Check In

Poll

Thursday 3/14/24 Check In

How are you feeling today?

• Focused

• Annoyed/Mad

• Sleepy

• Hungry

Multiple Choice

Is the following equation balanced?
4Fe + 3O₂ --> 2Fe₂O₃

• yes
• no

Multiple Choice

Which of the following equations are correctly balanced?

• 12CO₂ +H₂O --> C₆H₁₂O₆ + O₂

• CO₂ + 9H₂O --> C₆H₁₂O₆ + O₂

• CO₂ + H₂O --> 3C₆H₁₂O₆ + O₂

• 6CO₂ + 6H₂O --> C₆H₁₂O₆ + 6O₂

Multiple Choice

How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl₂ + H₂

• 1
• 2
• 3
• 4

Multiple Choice

When the equation is balanced what are the correct coefficients?

• 1, 1, 2

•  1, 3, 1

• 2, 2, 3

• 2, 3, 2

Simpler materials combine to make a compound

Synthesis

compound broken down into simpler materials

Decomposition

Compound containing carbon and hydrogen combines with oxygen gas to produce carbon dioxide and water.

Combustion

one element that starts out by itself switches with another element in a compound.

Single replacement

two positive and negative ions in two different compounds switch places

Double replacement

Match

Match the equation to the type of chemical reaction

synthesis

single replacement

combustion

decomposition

double replacement

• synthesis

• single replacement

• combustion

• decomposition

• double replacement

Multiple Choice

Which of the following best describes a limiting reactant?

• A reactant that runs out stopping the reaction.

• A reactant that is left over after the reaction is stopped.

• A reactant that is present at the beginning of the reaction.

• A reactant that is present at the end of the reaction.

Multiple Choice

Which of the following best describes an excess reactant?

• A reactant that runs out stopping the reaction.

• A reactant that is left over after the reaction is stopped.

• A reactant that is present at the beginning of the reaction.

• A reactant that is no longer present at the end of the reaction.

Multiple Choice

4NH₃ + 6NO → 5N₂ + 6H₂O

What is the limiting reactant if 10 moles of NH₃ react with 30 moles of NO?

• NH₃

• NO

• N₂

• H₂O

Multiple Choice

Use the equation 2 Al + 3 Cl₂ ---> 2 AlCl₃.  If 2 moles of aluminum and 2 moles of chlorine are reacted, identify the limiting reactant.

• AlCl3
• Cl2
• Al

Multiple Choice

What is the molar mass of C₆H₁₂O₆?

• 180.18 g/mol

• 180.12 g/mol

• 180.24 g/mol

• 180.06 g/mol

Multiple Choice

What is the percent composition by mass of sulfur in the compound MgSO₄ (gram formula mass = 120 g/mol)?

• 20%
• 27%
• 46%
• 53%

Multiple Choice

Find the percent composition of Cu₂S?

• %Cu= 67.987 %S= 32.013
• %Cu= 79.854   %S= 20.145
• %Cu= 35.946   %S= 64.054