Question

REPORT SHEET:

<Lab Data>

Mass of weighing paper: 0.1283 g

Mass of candle + weighing paper (t = 0 min): 12.3298 g

Mass of candle + weighing paper (t = 10 min): 10.7564 g

Mass of candle + weighing paper (t =20 min): 8.8150 g

Mass of candle + weighing paper (t = 30 min): 6.7656 g

Mass of candle + weighing paper (t =40 min): 4.8837 g

Mass of candle + weighing paper (t =50 min): 2.9982 g

Obtain a candle and a piece of weighing paper.

1. a) Measure and record the mass of the weighing paper: 0.1283 g

2. b) Measure the mass of the candle plus the weighing paper, then calculate the mass of just the candle, and record

these values in the Table as mass values for time t = 0.

c) With the candle on the weighing paper, light the candle, noting the time. Allow the candle to burn for 10 minutes, keeping any drippings on the weighing paper. After 10 minutes blow the flame out, then weigh the candle WITH the weighing paper. Record this mass, then calculate and record the mass ofjust the candle, in the

Table as mass values for time t = 10.

d) Repeat burning the candle for four additional 10 minute intervals, recording the mass after each burning periodintheTableasabove(t=20,t=30,etc.). Besuretoincludethemassofthedrippingsinyourcandle's mass!

   

Time, in minutes t = 0 min

t = l0 min ?

t = 20 min ?

t = 30 min ?

t = 40 min t = 50 min ?

Mass (grams). candle + paper

Mass, candle. in grams

            

e) Use the recorded data to generate a graph of mass (y-axis) versus time (x-axis) as the candle is burned.

Attach your graph to this Report.

6. f) Using the graph, determine (by interpolation or extrapolation, as needed) determine:

   1. 1) the mass of the candle after it burned for 6 minutes:

   2. 2) the mass of the candle after it burned for 35 minutes:

   3. 3) the mass of the candle after it burned for 55 minutes:

7. g) Using the best-fit line from your graph, determine the slope and then the equation of the line

(y = MX + b) for your data (b = original mass of the candle, at t = 0). Use this equation to determine the

"lifetime" of your candle. Thatis, the time it would take for your candle to burn down from it's starting mass to the final mass of 2.0grams. Show your calculations below.