Lesson 8: Act Science Mastery

Lesson 8: Act Science Mastery

Passage

Under certain conditions, hydrogen and oxygen gas can be mixed together to form H20. Students performed the following experiment to study the formation of H2O. 

Passage

The chemistry students fitted a gas syringe with a sparking device, then filled the syringe with different levels of H, and O2 gas. The syringe plunger was then locked in place and the gases were sparked. The resulting reaction caused water to form inside the syringe. Finally, the plunger was released, and the gas in the syringe was allowed to adjust temperature and pressure. The final the gas was recorded and analyzed to its composition. Table 1 shows the experiment with varying initial levels H2. 

Since the chemistry students have a learned that equal numbers of molecule different gases occupy equal volumes at the same pressure and temperature, the following  equation

 

2H2 + O2 ---> 2 H2O 

Multiple Choice

According to Table 1, what was the final volume of O2 in Trial 1?

• 20 mL

• 30 mL

• 0 mL

• 10 mL

The correct answer is C

The row labeled Trail 1 has a 0 in the Final 0₂ column.

Multiple Choice

According to Table 1, what was the final volume of H, in Trial 5?

• 0 mL

• 15 mL

• 50 mL

• 20mL

The correct answer is D

The row labeled Trail 5 has 20 in the Final H₂ column

Multiple Choice

What trail had the highest final volume of H₂

• Trail 2

• Trail 3

• Trail 4

• Trail 5

The correct answer is D

The highest number in the Final H₂ column is 20. This is in the Trail 5

Multiple Choice

What trail had the highest final volume of O₂?

• Trail 2

• Trail 4

• Trail 3

• Trail 5

The correct answer is B

The highest number in the Final O₂ column is 30. This is in Trail 3 row.

Multiple Choice

What trial had the greatest difference between the initial H₂ volume and the final H₂ volume?

• Trail 2

• Trail 3

• Trail 4

• Trail 5

The correct answer is D

The difference between the initial and final H₂ volume in the Trail 5 row os 50 - 30=20. This is greater than the difference in any other row