Question 1

A student measures the mass of a candle and weighing paper at various time intervals while burning the candle. Why is it important to include the mass of the drippings in the recorded mass of the candle?

Accepted Answer

To account for all the wax consumed, whether it vaporizes or drips, ensuring accurate measurement of mass change.

Question 2

If the mass of the weighing paper is $$1.49\ \mathrm{g}$$ and the mass of the candle plus weighing paper at $$t=0 is$$ $$6.89\ \mathrm{g}$$, what is the initial mass of the candle?

Accepted Answer

$$5.40\ \mathrm{g}$$

Question 3

After burning the candle for 50 minutes, the mass of the candle and weighing paper is $$3.39\ \mathrm{g}. If $$the mass of the weighing paper is $$1.49\ \mathrm{g}$$, what is the mass of the candle at $$t=50$$ min?

Accepted Answer

$$1.90\ \mathrm{g}$$

Question 4

Which of the following best describes the relationship between mass of the candle and time, as observed in the experiment?

Accepted Answer

The mass decreases linearly with time.

Question 5

Given the following data points for mass of the candle at $$t=0$$ min ($$5.40\ \mathrm{g}) $$and $$t=50$$ min ($$1.90\ \mathrm{g}$$), calculate the average rate of mass loss per minute.

Accepted Answer

$$0.11\ \mathrm{g/min}$$

Question 6

What is the equation of the best-fit line for mass ($$m) $$versus time ($$t) if $$the slope is $$-0.07\ \mathrm{g/min}$$ and the initial mass is $$5.40\ \mathrm{g}$$?

Accepted Answer

$$m = -0.07t + 5.40$$

Question 7

If a student accidentally forgets to include the mass of the drippings in their measurements, what effect will this have on their calculated rate of mass loss?

Accepted Answer

The calculated rate of mass loss will be artificially high.

Question 8

Why is it important to use a best-fit line when graphing mass versus time in this experiment?

Accepted Answer

To smooth out experimental errors and determine the overall trend.

Question 9

If the mass of the candle at $$t=20$$ min is $$3.65\ \mathrm{g}$$, what is the total mass lost from $$t=0 to$$ $$t=20$$ min?

Accepted Answer

$$1.75\ \mathrm{g}$$

Question 10

A student plots mass versus time and finds the slope of the line to be $$-0.09\ \mathrm{g/min}. $$What does the negative sign of the slope indicate?

Accepted Answer

The mass of the candle is decreasing over time.

Question 11

If the initial mass of the candle is $$5.40\ \mathrm{g}$$ and the rate of mass loss is $$0.07\ \mathrm{g/min}$$, how much candle mass will remain after 30 minutes?

Accepted Answer

$$3.30\ \mathrm{g}$$

Question 12

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

Accepted Answer

Not recording the mass of the weighing paper separately.

Question 13

If the mass of the candle decreases by $$0.70\ \mathrm{g}$$ every 10 minutes, what is the slope of the mass versus time graph?

Accepted Answer

$$-0.07\ \mathrm{g/min}$$

Question 14

A student calculates the equation of the line for mass versus time as $$m = -0.08t + 5.40. $$What does the $$5.40$$ represent in this equation?

Accepted Answer

The mass of the candle at $$t=0$$ minutes.

Question 15

If the mass of the candle at $$t=40$$ min is $$2.59\ \mathrm{g}$$, what is the average mass lost per 10-minute interval from $$t=0 to$$ $$t=40$$ min?

Accepted Answer

$$0.70\ \mathrm{g}$$

Question 16

Why is it necessary to record the mass of the weighing paper before starting the experiment?

Accepted Answer

To subtract it from the total mass and obtain the mass of the candle alone.

Question 17

If the mass of the candle at $$t=10$$ min is $$4.70\ \mathrm{g}$$, what is the percent mass loss from $$t=0 to$$ $$t=10$$ min if the initial mass was $$5.40\ \mathrm{g}$$?

Accepted Answer

$$13.0\%$$

Question 18

If the mass of the candle at $$t=30$$ min is $$3.30\ \mathrm{g}$$, what is the total mass lost from $$t=0 to$$ $$t=30$$ min?

Accepted Answer

$$2.10\ \mathrm{g}$$

Question 19

If the mass of the candle at $$t=0$$ min is $$5.40\ \mathrm{g}$$ and the mass at $$t=50$$ min is $$1.90\ \mathrm{g}$$, what is the equation for the best-fit line for mass ($$m) $$versus time ($$t$$)?

Accepted Answer

$$m = -0.07t + 5.40$$

Experiment 1: Preparing Graphs – Candle Mass vs. Time

Study Guide - Practice Questions

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