chemistry week 1
Hala Sughayar iLab: Week 1
BALANCE LAB
Introduction The purpose of this week’s iLab is to find the weight of different objects and record my findings/data. I will record my data on a chart. My observations will determine why each scale has a different weight for the same object being weighed. The two techniques practiced here are direct weighing and weighing by difference. The skills required vary depending upon the kind of balance used. In this lab I will practice the techniques required to use a centigram balance and electronic balance.
In general, different substances have the same exact densities even if they occupy the same volume or have the same mass. Throughout this experiment I was weighing the same items on different scales and I was very surprised by the results. Direct weighing simply requires learning how to read the mass directly from the balance. Weighing by difference requires recording the mass of an object in a container, recording the mass of the container only, and then calculating the mass of the object by subtracting the mass of the container from the mass of the object in the container. The centigram balance has two-decimal place points and the electronic balance has three-decimal place points. Each balance displays a different weight for the same objects.
Procedure
First you will need to weigh a slug on a centigram balance using the direct-weighing technique. The centigram balance can be found under the balances option under the equipment menu. Select the centigram balance and add one slug from the chemicals dialog box. Record the slug mass in the observations. Weigh the same slug directly on another centigram balance. Obtain a second centigram balance from the balances option under the equipment menu and place it under the first centigram balance so that the pans line up under each other. Select the centigram balance with the slug and choose pour/decant from the procedures menu. Record the mass of the slug. You will repeat
BALANCE LAB
Introduction The purpose of this week’s iLab is to find the weight of different objects and record my findings/data. I will record my data on a chart. My observations will determine why each scale has a different weight for the same object being weighed. The two techniques practiced here are direct weighing and weighing by difference. The skills required vary depending upon the kind of balance used. In this lab I will practice the techniques required to use a centigram balance and electronic balance.
In general, different substances have the same exact densities even if they occupy the same volume or have the same mass. Throughout this experiment I was weighing the same items on different scales and I was very surprised by the results. Direct weighing simply requires learning how to read the mass directly from the balance. Weighing by difference requires recording the mass of an object in a container, recording the mass of the container only, and then calculating the mass of the object by subtracting the mass of the container from the mass of the object in the container. The centigram balance has two-decimal place points and the electronic balance has three-decimal place points. Each balance displays a different weight for the same objects.
Procedure
First you will need to weigh a slug on a centigram balance using the direct-weighing technique. The centigram balance can be found under the balances option under the equipment menu. Select the centigram balance and add one slug from the chemicals dialog box. Record the slug mass in the observations. Weigh the same slug directly on another centigram balance. Obtain a second centigram balance from the balances option under the equipment menu and place it under the first centigram balance so that the pans line up under each other. Select the centigram balance with the slug and choose pour/decant from the procedures menu. Record the mass of the slug. You will repeat