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CSA SCIENCE PROMOTES
THE CULTURE OF
EXCELLENCE
CSA CHEMISTRY LABORATORY REPORT
SY: 2012 – 2013
Title: Measurements in Chemistry
Yr&Sec: 3A
Group # 9
Members Julia Antique
Kim Na Hyeon
__________________
Experiment Date
[2012.6.29 ]
M, T, W, Th, F
Date Submitted
[2012.7.3]
Performance
Rubrics
(Total/2=Score)
Laboratory
Report
Rating
25
50
7
25
Laboratory Activity
Final Score
In the silence of the Lab, scientists made amazing discoveries. What can we do in our time?
PARTS
ABSTRACT
Objectives: To make accurate measurements and apply the
mathematical part of Chemistry. To design our own procedure.
Materials: Pencil, Paper, Meter stick, Balances (triple beam, platform,
top-loading), Pair of dice, Aluminum can, Calculator, Small-scale, pipet,
Water, Plastic cup
Procedure: Measure the mass of an empty cup using all of the balances
Using :
Triple beam balance: Cup: 1.6 g
Platform balance: 1.6g
Electronic balance: 1.7g
Add 50 drops of water (H2O) using the medicine dropper to the empty
cup
Triple beam balance: 4g
Platform balance: 3.7 g
Electronic balance: 4.1g
Repeat
Design it:
a.)Procedure: design an experiment to determine if the size of the drop
varies with the angle it is delivered from the dropper (vertical (90
degrees), horizontal (0 degrees), midway (45 degrees))
Use the medicine dropper and try the different angles
Observe
Write your observations
Results:
Vertical: Speed- fast, Size- big
Horizontal: Speed- slow, Size- small
Midway- Speed- average, Size-medium
b.) Determine the volume of aluminum soda can
Procedure: Get the mass of an empty can(2g), fill the empty can with
water, transfer contents into graduated cylinder. Measure.
Results: 328 g
c.) Measure the chemistry lab and calculate the volume of air it contains
excluding the furniture and people
Length: 503 inches
Width: 222 inches
Height: 450 inches
Multiply: L*W*H, Result: 50249700 cm3
d.) Determine the volume of a pair of dice
ASSESSMENT
Performance Criteria
1.
2.
3.
This serves as the
overview of the report.
Objectives, materials
used, procedure, findings,
conclusion, application
and/or recommendation
are BRIEFLY mentioned.
This part should be
CONCISE.
P
S
Remarks
Points
Score
(For teacher’s use only.)
5
1
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Procedure: fill the graduated cylinder with water (20g), drop the dice into
the graduated cylinder. Measure (32g). Subtract the measurement with
the dice from the measurement without the dice (12g).
Get the volume of the dots
Procedure: Measure the sides of the dice
sxsxs
2 x 2 x 2 = 8-3
Volume of the dots: 5cm3
PART2:
1. Measure the mass of one level teaspoon of (NaCl), (H 2O), and
(CaCO3).
(using the electronic balance) Mass:
H2O: 4.1g
NaCl: 5.7g
CaCo3: 2.6g
MOLAR MASS (g/mol)
H2O: 4.1
NaCl: 5.7
CaCo3: 2.6
PRESENTATION OF DATA
A. Sample Calculation/s
b.) 330-2=328g
c.) 503*222*450=50249700 cm3
d.)32-20=12g, 2 x 2 x 2 = 8-3
Moles of each compound: H20- 2(1.008)+16.00= 18.016
NaCl- 22.99+35.45=58.44
CaCO3- 40.08+3(12.01+16.00)
40.08+ 84.03= 124.11
B. Tables and/or Graphs
Data Table
H2O (l)
NaCl (s)
CaCO3(I)
5
4.
5.
6.
7.
Mass (grams)
4.1g
5.7g
2.6g
Molar Mass
(g/mol)
4.1g
18.016
g/mol
5.7g
58.44 g/mol
2.6g
124.11 g/mo
8.
Moles of each
compound
Moles of each
element
Atoms of each
element
18.016
0.23 mol
58.44
0.098 mol
124.11
0.021 mol
H-1.008
O-16.00
Na-22.99
Cl-35.45
Ca-40.08
C-12.01
O-16.00
Na-1
Cl-1
Ca-1
CO-3
H=0.46 mol
O=0.23 mol
H-1
O-2
IF APPLICABLE,
demonstrate how each
formula is being used in
computing for the values.
The computations are
presented logically, never
setting aside the rules
learned in math classes.
The group chooses the
PROPER form of
presenting the data,
whether in tabular form,
graphical form or both.
The design of the tables
and graphs is
APPROPRIATE for the
activity (including but not
limited to the interval of
values, determination of
constants, proper
placement of dependent,
independent or
manipulated variables, as
the need arises).
All parts of the table or
graph are labeled
PROPERLY (including but
not limited to title, units,
x-axis, y-axis, header, etc.)
1
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H= 2.77x1023
O= 1.38
x1023
Figure A
ANALYSIS
1.
2.
3.
4.
What is the average mass of a single drop of water in
milligrams? (1 g = 1000 mg)
Mass of 50 drops of water = 4g
4 g / 50 = 0.08 g
0.08g x 1000 = 80mg
80mg per drop
The density of water is 1.00 g/cm3. Calculate the volume of a
single drop in cm3 and mL. (1 mL = 1 cm3) What is the volume of
a drop in microliters (um)? (1um = 1mL)
1000 microliters = 1 milliliter
Volume of a single drop of water = 0.07 cm3 = 0.07 mL= 0.07 um
0.07 um
What is the density of water in units of mg/cm3 and mg/mL? (1 g
= 1000 mg)
1000 mg/cm3, 1ml
9.
10.
11.
12.
Part 2
5.) H2O(Water) because it has 18.016 moles
6.) CaCO3 because it has 4 atoms
CONCLUSION
For this experiment, the members of group 9 learned the importance of
time management and accuracy in experiments because they did not
finish the experiment on time and did not get sufficient information.
RECOMMENDATION
The members of Group 9 suggest that there be given more time to finish
the experiment because of a lot of experiments and making your own
procedures.
APPLICATION
This can be applied to our daily lives by knowing how much products the
group used so that no other products may be wasted and what we use is
a sufficient amount, saving us money.
References
http://www.endmemo.com/convert/EMDensity.php
http://answers.yahoo.com/question/index?qid=20080914111136AAc6o
Ue
http://misterguch.brinkster.net/molarmass.html
5
2
5
1
This can be done as an Answer
to Follow-up Questions or
Interpretation of Data.
13.
When the original
procedure paper
CONTAINS Follow-up
Questions given by the
teacher, the lab report
answers all the questions.
If the original procedure
paper does NOT contain
Follow-up Questions, the
lab report presents a
discussion on the
implications of the data
gathered.
Matters that are indirectly
discovered are discussed
including the effects of
the limitations of the
activity on the results.
All discussions of data are
in lieu with the objectives
of the activity and are
supported by the data.
Information from
published resources are
properly cited.
14.
Questions directly or
indirectly posted by the
objectives are addressed
clearly and are consistent
with the gathered data.
15.
Weaknesses of the design
of the experiment are
discussed.
Future students and
teachers are being
advised on how to
IMPROVE the activity.
This part should
state whether
the results
support your
Hypothesis or
not, or whether
the scientific
principle was
demonstrated
adequately or
not.
2
16.
These
experiments are
tested. You just
did not manage
your time well.
2
17.
18.
The topic of the activity is
being related to the
situation in the
community. The more
recent, the better.
Following the APA format
of citation
1
1
Specify more
1
0
Use reliable
references not
just websites.
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Your entire report is incomplete!
1.
Repeat Step 1 using the triple beam balance and the platform balance.
2.
The following small-scale activities allow you to develop your own procedures and analyze the results. Include the
procedures of the “Design it” in your lab report and the necessary analysis and answers to questions.
a. Design it: Design an experiment to determine if the size of drops varies with the angle at which they are
delivered from the dropper. Try vertical (90o), horizontal (0o), and halfway between (45o). Repeat until your
results are consistent.
Analyze it: What is the best angle to hold a dropper for ease of use and consistency of measurement? Explain.
Why is it important to expel the air bubbles before you begin the experiment?
Part 2
2.
3.
b.
Design it: Make the necessary measurements to determine the volume of aluminum used to make an
aluminum soda can. Hint: Look at the density of aluminum (2.6989 g/cm3).
c.
Design it: Measure a room and calculate the volume of air it contains. Estimate the percent error associated
with not taking into account the furniture and people in the room.
d.
Design it: Make the necessary calculations to determine the volume of a pair of dice. First ignore the volume
of the dots on each face, and then account for the volume of the dots. What is your error and percent error
when you ignore the holes?
e.
Design it: Design an experiment to determine the volume of your body. Write down what measurements you
would need to make and what calculations you would do. What additional information might be helpful?
Measure the mass of one level teaspoon of (NaCl), (H2O), and (CaCO3). Make a table similar to Figure A. to record your
measured and calculated data.
Design an experiment that will determine the number of atoms of calcium, carbon, and oxygen it takes to write your
name on the chalkboard with a piece of chalk. Assume chalk is 100% calcium carbonate.