Q: Which formula is used to calculate the percent error in the experiment?

$$\\text{Percent error} = \\frac{\\text{experimental value} - \\text{calculated value}}{\\text{calculated value}} \\times 100\\%$$

Q: If the calculated volume of the flask is $$600 \\text{mL}$$ and the experimental volume is $$620 \\text{mL}$$, what is the percent error?

$$\\frac{620 - 600}{600} \\times 100\\% = 3.33\\%$$

Q: If the air in the flask is initially at $$100^\ ext{o}C$$ and then cooled to $$23^\ ext{o}C$$, which equation would you use to relate the initial and final volumes of air?

$$\\frac{V_1$}{T_1$} = \\frac{V_2$}{T_2$}$$

Question 1

Which piece of equipment is used to heat the water in the experiment described in the study materials?

Accepted Answer

A Bunsen burner

Question 2

What is the purpose of inserting a one-holed rubber stopper with a glass tube into the Erlenmeyer flask during the experiment?

Accepted Answer

To allow air to escape and be replaced by water as the flask cools

Question 3

Why is the flask submerged in cold water after boiling, according to the procedure?

Accepted Answer

To cool the air inside the flask and measure the change in volume

Question 4

If the temperature of boiling water is $$100^\	ext{o}C$$ and the temperature of cold water is $$23^\	ext{o}C$$, what is the main variable being tested in this experiment?

Accepted Answer

The effect of temperature on the volume of air

Question 5

Which formula is used to calculate the percent error in the experiment?

Accepted Answer

$$\text{Percent error} = \frac{\text{experimental value} - \text{calculated value}}{\text{calculated value}} \times 100\%$$

Question 6

After cooling the flask in cold water, water rises in the glass tubing. What does this indicate about the air inside the flask?

Accepted Answer

The air contracted as it cooled, reducing its volume

Question 7

If the volume of water entering the flask after cooling is measured to be $$26.5 \text{mL}$$, what does this volume represent?

Accepted Answer

The decrease in air volume due to cooling

Question 8

Which of the following best explains why the experimental volume of the flask is greater than the value stamped on the flask?

Accepted Answer

The stamped value does not account for the volume of the stopper and tubing

Question 9

During the experiment, why is it important to record the temperature of the boiling water with a thermometer?

Accepted Answer

To ensure accurate calculation of the change in air volume

Question 10

If the calculated volume of the flask is $$600 \text{mL}$$ and the experimental volume is $$620 \text{mL}$$, what is the percent error?

Accepted Answer

$$\frac{620 - 600}{600} \times 100\% = 3.33\%$$

Question 11

What is the main scientific principle being demonstrated by the change in air volume with temperature in this experiment?

Accepted Answer

Charles's Law

Question 12

If the air in the flask is initially at $$100^\	ext{o}C$$ and then cooled to $$23^\	ext{o}C$$, which equation would you use to relate the initial and final volumes of air?

Accepted Answer

$$\frac{V_1$}{T_1$} = \frac{V_2$}{T_2$}$$

Question 13

A student forgets to fully submerge the flask in cold water during the cooling step. What effect will this have on the measured volume of water entering the flask?

Accepted Answer

The measured volume will be less than the actual change in air volume

Question 14

Why is it necessary to repeat the procedure for a second trial in the experiment?

Accepted Answer

To improve accuracy and reliability of the results

Question 15

If the glass tubing is not filled with water after cooling, what does this suggest about the air pressure inside the flask?

Accepted Answer

The air pressure inside the flask is equal to the atmospheric pressure

Question 16

Which of the following is a plausible source of error in this experiment?

Accepted Answer

Not allowing the flask to cool completely before measuring the water volume

Question 17

In a real-world medical scenario, why is it important to understand the relationship between gas volume and temperature?

Accepted Answer

It helps in understanding how respiratory gases behave in the human body

Question 18

If a student calculates a percent error of $$10\%$$ for their experiment, what does this indicate?

Accepted Answer

Their experimental value deviates from the calculated value by $$10\%$$

Question 19

Which step in the procedure ensures that the volume of air measured is accurate after cooling?

Accepted Answer

Submerging the flask so the water level inside matches the water level outside

Measuring the Volume of Air and the Effect of Temperature: Experimental Procedures and Calculations

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