Pre AP Chemistry Spring Semester Review 2018

What is the limiting reactant if 10 moles of NH₃  react  with 30.0 moles of NO?
4NH₃+6NO --> 5N₂ + 6H₂O

• NH₃
• NO
• N₂
• water

Tags

NGSS.HS-PS1-7

When 12 moles of O₂ reacts with 1.1 mole of C₁₀H₈ what is the limiting reactant?  C₁₀H₈ + 12 O₂ --> 10 CO₂ + 4 H₂O

• Oxygen
• C₁₀H₈
• Water
• Carbon Dioxide

Tags

NGSS.HS-PS1-7

P₄ + 3O₂ --> P₄O₆ 
What is the limiting reactant is 12 moles of P₄ react with 15 moles of O₂?

• P₄
• O₂
• P₄O₆ 
• none of the above

Tags

NGSS.HS-PS1-7

Theoretical yield = 73g
Actual yield = 62g
Calculate the percent yield.

• 1.16%
• 116%
• 85%
• 76%

Tags

NGSS.HS-PS1-7

What happens to iodine when iodate, IO₃^–, converted to iodine, I₂?

• Undergo reduction and oxidation number changes from –1 to 0
• Undergo oxidation and oxidation number changes from –1 to 0
• Undergo reduction and oxidation number change from +5 to 0
• Undergo oxidation and oxidation number change from +5 to 0

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-7

What are the oxidation numbers of elements in sulfuric acid, H₂SO₄?

• A
• B
• C
• D

Which are examples of reduction?

• I and II
• I and III
• II and III
• I, II and III

What is the oxidation number of P in H₂P₂O₇^2-?

• +10

• +5

• +6

• +12

• -5

After you determine the oxidation numbers of all elements in the redox reaction how do you determine which one has been oxidized?

• Find the element that has lost electrons (oxidation number has increased)

• Find the element that has lost electrons (oxidation number has decreased)

• Find the element that has gained electrons (oxidation number has increased)

• Find the element that has gained electrons (oxidation number has decreased)

In a lab, a scientist calculate he should produce 12.3 grams of product in his experiment. When he is finished collecting his product it weighs 10.1 grams. What is his percent yield?

• 82%
• 0.82%
• 10.1 %
• 100%

Tags

NGSS.HS-PS1-7