Chemistry 2025 Final Exam Challenge

When 5.00 g of propane (C₃H₈) burns in excess oxygen, how many grams of CO₂ are produced? (C₃H₈ + 5O₂ → 3CO₂ + 4H₂O)

• 5.00 g
• 6.82 g
• 11.99 g
• 14.97 g

• 7.00 g

How many liters of hydrogen gas at STP are produced from 10.0 g of zinc reacting with excess HCl? (Zn + 2HCl → ZnCl₂ + H₂)

• 2.56 L
• 3.43 L
• 5.12 L
• 1.14 L
• 22.4 L

What is the percent yield if 15.0 g of water are formed but 20.0 g were expected? (Theoretical = 20.0 g)

• 75.0%
• 25.0%
• 133%
• 50.0%
• 20%

If 10.0 g of NaOH reacts with 10.0 g of H₂SO₄, which is the limiting reagent? (2NaOH + H₂SO₄ → Na₂SO₄ + 2H₂O)

• NaOH
• H₂SO₄
• Na₂SO₄
• Water
• Neither is limiting

Tags

NGSS.HS-PS1-7

How many molecules of CO₂ are produced when 1.00 mol of glucose reacts completely? (C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O)

• 6.02 × 10²³
• 3.61 × 10²⁴

• 3.01 × 10²³
• 6.00 mol
• 6.02 × 10²²

Tags

NGSS.MS-PS1-5

What volume of 0.500 M HCl is required to completely react with 25.0 mL of 0.250 M NaOH? (HCl + NaOH → NaCl + H₂O)

• 62.5 mL
• 12.5 mL
• 25.0 mL
• 50.0 mL
• 31.3 mL

A 4.00 g sample of methane combusts. How much water (in grams) is produced? (CH₄ + 2O₂ → CO₂ + 2H₂O)

• 9.00 g
• 6.00 g
• 8.00 g
• 1.00 g
• 4.50 g

Tags

NGSS.HS-PS1-7

How many grams of Al₂O₃ are produced from 10.0 g of Al reacting with excess O₂? (4Al + 3O₂ → 2Al₂O₃)

• 18.9 g
• 25.5 g
• 9.43 g
• 15.2 g
• 10.0 g

Tags

NGSS.HS-PS1-7

What mass of oxygen is needed to completely react with 2.50 g of hydrogen gas? (2H₂ + O₂ → 2H₂O)

• 10.0 g
• 20.0 g
• 5.00 g
• 19.8 g

• 3.33 g

Tags

NGSS.HS-PS1-7

How many grams of NaCl can be formed from 0.500 mol of Na and 0.500 mol of Cl₂? (2Na + Cl₂ → 2NaCl)

• 29.2 g
• 58.5 g
• 11.7 g
• 23.0 g
• 19.5 g

Tags

NGSS.HS-PS1-7