Exp. 1.4 Measuring Volume by Displacement of Water
II. Data and Observations
Class data table
III. Conclusion: Respond to the purpose of the experiment. Use portions of the
purposes in your conclusion. Include the percentage of the dry sand that is actually sand.
1. Describe what is actually being measured when dry sand is put into a
Say the sand was
wet before it was poured into the graduated cylinder,
1. How would this affect the calculation of air space between the sand grains?
Exp. 1.1 Heating Baking Soda
Purpose: To determine...
Data and Observations:
(Use a straight edge. Plan ahead. As neatly as you can, copy the following data tables into your lab notebook.)
Table 1. Observations of Heating Baking Soda
Table 2. The Tea Test
Conclusion: Respond to the purpose. Include portions of the purpose in your response.
Use part of the question in your response.
Skip a space between each question.
Do not use personal pronouns.
1. Identify the piece of equipment (or tool) that allowed any liquid produced from heating the baking soda to be observed?
2. Describe the piece(s) of equipment (or tools) that allowed any gas produced from heating the baking soda to be observed?
3. Read Figure 1.4 on p. 4 in your textbook. Explain the purpose or importance of heating an empty test tube.
Think about the observations of the tea test. Could the unheated baking
soda and the heated baking soda be the same substance? What is your
1. Imagine that there was a large air bubble in the bottle in the beginning of the experiment. How would this large air bubble affect the observed amount of gas in the bottle at the end of the experiment?
Purpose #2: To determine if the
mass of an object will be the same if the object is massed several times. In other words, how reliable and reproducible mass measurements are when made with a balance.
II. Data and Observations:
______ mass (g) ___
trial # penny rubber stopper
Respond to both purposes in complete sentences.
1. The "range" of a set of data refers to the lowest and the highest value collected. Indicate the range of the mass measurements collected, i.e. 2.56g - 2.58g for the penny and/or the stopper.
2. "Precision" in chemistry refers to how consistent the data is. Did the data collected represent precision? Explain.
3. What is the smallest amount of mass that the electronic balances used in this experiment can detect?
4. Say two measurements for the mass of a stopper were 5.68 g and 5.67 g. Thinking about your response to question 3, would these two measurements be considered the same? Explain.
Sources of Error