Lab 1

Topics: Mass, Kilogram, Weight / Pages: 5 (1023 words) / Published: Jun 4th, 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

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