1. With a partner and a piece of paper…
Each of you get a cup. Dry it out. Record its mass.
Obtain 50 beans of one type in the cup and record mass. Return beans to correct container.
Repeat with each of the 5 bean types.

2. The Bean Lab (put this in your notebook)
Objectives
To determine the relative atomic masses by creating relative bean masses
To establish a standard counting quantity for beans that provides an analogy to the mole

3. Using the data table to report results,
Determine the mass of 50 of each type of bean in a cup
Determine the mass of 50 beans alone
Divide the mass of 50 beans by the one that gave the smallest result to determine “relative mass”. Your smallest bean mass will become ONE when you divide it, also, by itself and everything else will be compared to it.
Place enough beans on the balance to equal the RELATIVE MASS of each type of bean. This is the “number of beans in a pot”.

4. Results Data Type of Bean Symbol Mass of cup and 50 beans
Mass of 50 beans alone
Relative Mass
Number of beans in 1 Pot
Lentil Le
Lima L
Navy N
Kidney K
Soy S

5. Mole and Mass Relationships
Substance
Particles in 1 mole
Mass of 1 mole
hydrogen
6.022 x 1023
1.008 g
carbon
12.01 g
oxygen
16.00 g
sulfur
32.06 g
calcium
40.08 g
chlorine
35.45 g
copper
63.55 g

6. Calculations and Questions
Calculation: Relative mass; Average # of beans in a pot +/- uncertainty
Questions:
A “pot” of beans is the number needed to make up the relative mass. Compare the # in a pot for each bean. Why isn’t the number the same for all?
What was the average # per pot including uncertainty?

7. Questions continued 3. Calculate: (sample on next slide)
a. # pots in 250 g navy beans
b. # beans in 250 grams kidney beans
c. # pots in 250 lima beans
d. # beans in 3.17 pots of any bean
e. # grams in 3.17 pots lentils
4. In which of the above conversions does the type of bean not matter (same result)? Explain.

8. Using known ratios to solve unknown relationships:
Here are the facts we know from our experiment:
Use known ratios set equal to the unknown ratio (this is a proportion)
3a.

9. Questions continued
5. Why did you have to round answers to the nearest bean? How is this parallel to atoms?
Discussion: In a well-developed paragraph, write a standard discussion. Include how this lab activity provides an analogy to the mole and beans are analogous to chemical particles.