Lab 1

Topics: Mass, Kilogram, Weight Pages: 5 (1023 words) Published: June 3, 2013
Lab, Week # 1

BALANCE LAB

Introduction

The purpose of this lab is to learn how to utilize two different balances to find the mass of different chemicals in the ChemLab program. A balance is an instrument used to determine the mass of a chemical. To accomplish this we use direct weighing and weighing by difference on both the centigram and electronic balances.  

Equipment
1 Centigram Balances
1 Electronic Balance
1 100ml Beakers
5 Copper Slugs
2 Unknown Weights (Label # 1, # 2)

Procedure
Centigram Balance-Direct Weighing Technique
1. Obtain the centigram balance.
2. Add the copper slug to the balance.
3. Record the mass of the copper slug in grams to the observation section. 4. Retain scale and slug for future use.

Centigram Balance-Weighing by Difference
1. Obtain the centigram balance.
2. Obtain a 100 mL beaker.
3. Put the beaker on the scale and record the mass in grams to the observation section. 4. Transfer the copper slug from the first part of the experiment to the beaker. 5. Weight and record the mass of the beaker + slug into the observation section. 6. Subtract the mass of the beaker from the mass of the beaker + slug. 7. Record the mass of the copper slug in grams to the observation section. 8. Retain the beaker and slug for future use.

Electronic Balance-Direct Weighing Technique
1. Obtain the electronic balance.
2. Add the copper slug to the balance.
3. Record the mass of the copper slug in grams to the observation section. 4. Retain scale and slug for future use.

Electronic Balance- Weighing by Difference
1. Obtain the electronic balance.
2. Obtain a 100 mL beaker.
3. Put the beaker on the scale and record the mass in grams to the observation section. 4. Transfer the copper slug from the first part of the experiment to the beaker. 5. Weight and record the mass of the beaker + slug into the observation section. 6. Subtract the mass of the beaker from the mass of the beaker + slug. 7. Record the mass of the copper slug in grams to the observation section. 8. Retain the beaker and slug for future use.

Electronic Balance-Average Mass of a Copper Slug
1. Obtain the electronic balance.
2. Add one copper slug to the balance, record the mass in grams to the observation section. 3. Add a second copper slug to the balance, record the mass in grams to the observation section. 4. Add a third copper slug to the balance, record the mass in grams to the observation section. 5. Add a fourth copper slug to the balance, record the mass in grams to the observation section. 6. Add a fifth copper slug to the balance, record the mass in grams to the observation section. 7. Calculate the average mass of a single copper slug; record the mass in grams to the observation section.

Determining the Mass of Unknown Weights
1. Obtain the centigram balance.
2. Obtain a 100 mL beaker.
3. Put the beaker on the scale and record the mass in grams to the observation section. 4. Add unknown weight # 1 to the beaker, record the mass in grams to the observation section. 5. Subtract the mass of the beaker from the mass of the beaker + unknown weight # 1. 6. Record the mass of the unknown weight # 1 in grams to the observation section. 7. Remove unknown weight # 1 from the beaker.

8. Add unknown weight # 2 to the beaker, record the mass in grams to the observation section. 9. Record the weight of the beaker from step 3 above.
10. Subtract the mass of the beaker from the mass of the beaker + unknown weight # 2. 11. Record the mass of the unknown weight #2 in grams to the observation section.

Observations and Results

Part I: Centrigram Balance

Direct weighing method:

Mass of slug 2.24 g

Weighing by difference:

Mass of beaker| 49.6 g|
Mass of beaker + slug| 52.64 g|
Mass of slug| 3.04 g|

Part II: Electronic Balance

Direct weighing method:...
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