Setting Up Lab NB and Density Lab_student.notebook
MONDAY, SEPT. 15 WARM-UP
September 15, 2014
b. Find the volume that 35.2 g of carbon tetrachloride
(CCl4) will occupy if it has a density of 1.60 g/mL.
What are you solving for? ___________
What is the equation?________________
1. Solve the following problems showing all your work
including equations and units.
a. A cup of gold colored metal beads was measured to have
a mass 425 grams. By water displacement, the volume of
the beads was calculated to be 48.0 cm3. Calculate the
density and then identify the metal.
What are you solving for? ___________
M
What is the equation?________________
c. The density of ethanol is 0.789 g/mL. Find the mass of a
sample of ethanol that has a volume of 150.0 mL.
What are you solving for? ___________
What is the equation?________________
D V
Gold: 19.3 g/mL
M
Copper: 8.86 g/mL
D V
Bronze: 9.87 g/mL
Sep 14­11:13 AM
Sep 14­11:13 AM
2. Answer the following multiple choice questions based on the
Answers to Density Homework Problems
graph below of the Mass vs. Volume of Substance “X”. Choose the
one best answer for each.
a. What is the volume of substance
X when its mass is 15 grams?
# 1­12 ODDS ONLY
1.
M
D V
Show Work, Sig Figs, Units
b. What is the mass of substance
X when its volume is 8 ml?
d = 306.0 g / 22.5 mL
3. 13.6 g/mL
c. On a graph of volume vs. mass,
the slope of the line is equal to
density. Calculate the slope of the
line using ( y2-y1/x2-x1 ). Now, what
is the density of substance X using
the data from the graph?
d = 1896 g / 212.52 cm3 = 8.9 g/cm3
7. 1.84 g/mL
d =65.14 g / 35.4 mL
9. 11.3 g/cm3
11. 238 cm3
Sep 14­11:41 AM
V = (8.4 cm) (5.5 cm) (4.6 cm) = 212.52 cm3
5. 8.9 g/cm3
V =(4.50 cm) (5.20 cm) (6.00 cm) = 140.4 cm3
d = 1591 g / 140.4 cm3 = 11.3 g/cm3
V = 2500.0 g / (10.5 g/cm3) = 238 cm
Sep 14­11:25 AM
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Setting Up Lab NB and Density Lab_student.notebook
Setting Up the Lab Notebook
September 15, 2014
General Guidelines
1. Be sure to fill in the Table of Contents at the front of your lab
The laboratory notebook is a permanent, documented,
notebook. Include date, title, and page number.
and primary record of laboratory observations. Each
2. Write in a third person, passive voice. Avoid personal pronouns.
page has a duplicate, so when you write you will
3. Always use black or blue pen when writing in your lab notebook.
produce an original and a copy. A laboratory notebook
4. If you make a mistake draw a single line through it! NO WHITE-
should be legible, and data in it should be readily
OUT.
accessible, clearly labeled with units and grouped in a
5. Cut out and tape any graphs or figures into your notebook (original
logical way.
and copy).
6. Make sure the back flap is under the “copy” so you only write on
one page.
7. NEVER tear out a master page from you lab notebook, even if you
make a mistake.
Sep 14­1:01 PM
8. Show all calculations neatly and accurately; box your final answer
with correct units.
9. Check your significant figures.
Sep 14­1:08 PM
Final Lab Report
All lab reports will contain the following sections in this order. A
formal typed lab will be completed 1-2 times a quarter.
10. For each lab include the following:
a. Exp. Number= lab number (sequential)
b. Experiment/Subject = lab title
1. Question/Purpose: I will give this to you for each lab.
c. Date = date of experiment
2. Short Background: provide context for the question,
d. Name = your name
why are we doing this experiment, big idea we are
e. Lab Partner= lab partner‛s name(s)
investigating, answers to pre-lab questions
f. Locker/Desk No. = lab station
g. Course and Section No. = class (HC, CP, AP) and period
3. Flowchart/Procedures: visual or graphical represent of
h. Signature and Date = you do this before you turn it in.
how you will complete the lab and steps of procedure
i. Witness/TA = my signature at end of lab and after clean up.
12. Only turn in “copy” to me, stapled.
Sep 14­1:08 PM
4. Hypothesis: written as an “if, then” statement
Sep 14­2:09 PM
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Setting Up Lab NB and Density Lab_student.notebook
Final Lab Report
September 15, 2014
Lab # 1: Comparing the Density of Metals
All lab reports will contain the following sections in this order. A
formal typed lab will be completed 1-2 times a quarter.
5. Data Table: use a ruler, title
6. Graph(s): use a ruler, title, label axes, legend (when
appropriate), logical intervals
7. Analysis: explain your data, show your calculations with
units, perform error analysis
8. Conclusion: what did you learn from the lab as a whole
Different materials can be distinguished from one another because they have
different properties. One property that is often used to identify unknown
materials is density. Density is defined as the ratio of a material‛s mass to its
volume. By measuring the mass and volume of a sample of material you can
obtain an important clue about the identity of the material.
Problem:
Can you identify unknown metals by calculating their density?
Objectives:
∙ Measure the mass and volume of four metal samples
∙ Calculate the density of each sample from these measurements.
∙ Compare the calculated densities with known densities of specific
metals.
∙ Identify each metal sample
Sep 14­2:09 PM
Task # 1: Comparing the Density of Metals
Complete the following sections on your LAB MAP HANDOUT.
Experiment # 1
Lab Table # TBD
Sep 14­2:21 PM
Task # 1: Comparing the Density of Metals
Flowchart/Explanation of Initial Experiment: (This should be a
pictorial/graphical version of your procedure)
Investigative Lab (title) Comparing the Density of Metals
Density
Driving Question:
Can you identify unknown metals by calculating their density?
Volume
Mass
Initial Hypothesis:
Use object
If we experimentally determine density, then we can ID the
Place metal on balance
displacement to grad.
metal.
and record mass
cylinder
Hypothesis Support (Background):
Different materials can be distinguished from one another
because they have different properties.
Sep 14­2:21 PM
Sep 14­2:21 PM
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Setting Up Lab NB and Density Lab_student.notebook
Task # 1: Comparing the Density of Metals
Data Table Set-up: What do you need to record??
The various metal samples
Dependent Variable: What are you trying to measure?
The density of the metal
Mass (g)
Volume of water Volume of water (ml)
+ sample (ml)
Task # 2: Comparing the Density of Metals
On your lab map, (if you have room) or on the lab handout itself,
Independent Variable(s): What can you manipulate or change?
Sample
September 15, 2014
answer the pre-lab questions.
Prelab questions:
1. What is the formula to calculate density?
2. What are the units for density?
Volume of sample (ml)
Density (g/ml)
3. A sample of metal has a mass of 85.6 g and a volume of 12.1
ml. What is the density of metal X?
4. A metal bar has a density of 19.3 g/ml and a mass of 50.0 g.
What is the volume of the bar?
Sep 14­2:52 PM
Sep 14­2:59 PM
Task # 3: Comparing the Density of Metals
When you have completed TASKS 1-2, have me come
check your LAB MAP and you may begin your lab.
When you are DONE with your lab:
- Return all materials
- Clean up lab station
- Begin your lab write-up in journal OR work on
density problems (EVENS)
FINAL COPY OF WRITTEN LAB DUE FRI. 9/19
Should be neat, legible and have necessary info
Sep 14­2:59 PM
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