Objective
Familiarity with the various instruments used for making physical measurements in the laboratory is essential to the study of experimental chemistry. In this experiment, you will investigate the uses and limits of the various types of laboratory balances. (Wentworth, pg. 1)
Summary of Procedures
• All observations and data must be recorded in the notebook using ink.
• Observe the balances on the lab. If you do not know how to use them, ask the instructor for a demonstration. Make sure you are able to determine the level of precision permitted by each type of balance.
• The instructor will hand you objects whose mass are for you to determine. These objects will be labeled with a number or letter. Record the number or letter in …show more content…
It is important to always use the same balance during the course of an experiment, so that the experiment doesn’t result erroneous. The reason it may result erroneous is because there will be a mixing of the balances and weights.
2.) What error is introduced in a mass determination if the object being weighed is warm? Why?
The error that is introduced is that the mass determination is not accurate. For the reason that the object makes the air around it to become heated. Therefore, the air then goes up and the movement may be detected causing the mass determination to not be accurate.
3.) Why should reagent chemicals never be weighed directly on the pan of the balance?
Reagent chemicals should be weighed directly into the beaker or flask in which they are to be used. Those type of chemicals should never be weighed directly on the pan, for the reason that many chemicals react with the balance pan. Therefore, by not weighing them directly to the pan we are preventing any kind of chemical reaction that can result
Familiarity with the various instruments used for making physical measurements in the laboratory is essential to the study of experimental chemistry. In this experiment, you will investigate the uses and limits of the various types of laboratory balances. (Wentworth, pg. 1)
Summary of Procedures
• All observations and data must be recorded in the notebook using ink.
• Observe the balances on the lab. If you do not know how to use them, ask the instructor for a demonstration. Make sure you are able to determine the level of precision permitted by each type of balance.
• The instructor will hand you objects whose mass are for you to determine. These objects will be labeled with a number or letter. Record the number or letter in …show more content…
It is important to always use the same balance during the course of an experiment, so that the experiment doesn’t result erroneous. The reason it may result erroneous is because there will be a mixing of the balances and weights.
2.) What error is introduced in a mass determination if the object being weighed is warm? Why?
The error that is introduced is that the mass determination is not accurate. For the reason that the object makes the air around it to become heated. Therefore, the air then goes up and the movement may be detected causing the mass determination to not be accurate.
3.) Why should reagent chemicals never be weighed directly on the pan of the balance?
Reagent chemicals should be weighed directly into the beaker or flask in which they are to be used. Those type of chemicals should never be weighed directly on the pan, for the reason that many chemicals react with the balance pan. Therefore, by not weighing them directly to the pan we are preventing any kind of chemical reaction that can result