Practice Problem

Please have these problem ready (solved) when you come to the lab? 

1. A 31.1 g of wafer of pure gold initially at 69.3 C is submerged into 64.2 g of water at 27.8 C in an insulated container. What is the final temperature of the system at the thermal equilibrium? (Cs of Gold is 0.128 J/g.C and Cs of H2O is 4.18 J/g.C ) 
2. A block of copper of unknown mass has an initial temperature of 65.5 C. The copper is immersed in a beaker containing 95.7 g of water at 22.7 C. When the two substances reach thermal equilibrium, the final temperature is 24.2 C. What is the mass of the copper block? (Cs of Copper is 0.385 J/g.C)

Thermo: Heat and Calorimetry

ChemQuiz: Baking

First Law of Thermodynamics

Heat Temperature and Energy

What to Bring to Each Class (Chemistry Lab)

Students should bring the following to every class:

• Textbook
• Student’s answers to OYO, Review Questions, Practice Problems, and Module Tests
• Lab notebook**
• Pencil
• Calculator

** Lab Notebooks: a 3-ring binder or spiral notebook

Lab #1 on 08/01/2014

• Please bring a calculator to the lab.
• A quiz will be given from module 1 ("Comparing Conversions to Measurements" in Exploring Creation with Chemistry) in the lab.

The Importance of Units
Without units much of our work as scientists would be meaningless. We need to express our thoughts clearly and units give meaning to the numbers we calculate. Depending on which units we use, the numbers are different (e.g. 3.8 m and 3800 mm actually represent the same length). Units are an essential part of the language we use. Units must be specified when expressing physical quantities. In the case of the curtain example at the beginning of the chapter, the result of a misunderstanding would simply have been an incorrect amount of material cut. However, sometimes such misunderstandings have catastrophic results. Here is an extract from a story on CNN's website (http://goo.gl/XFsr8):

NASA lost a 125 million Mars orbiter in 1999

CNN NASA lost a 125 million Mars orbiter because one engineering team used metric units while another used English units for a key spacecraft operation, according to a review finding released Thursday.

For that reason, information failed to transfer between the Mars Climate Orbiter spacecraft team at Lockheed Martin in Colorado and the mission navigation team in California. Lockheed Martin built the spacecraft.

Lab Report

Lab Report 
(Adapted from http://donnayoung.org/)

A laboratory report has three main functions:
(1) To provide a record of the experiments and raw data included in the report,
(2) To provide sufficient information to reproduce or extend the data, and
(3) To analyze the data, present conclusions and make recommendations based on the experimental work.



Cover Sheet:

This page has the title of the experiment, your name, your lab partner’s names, the date that the lab was performed.

Introduction:

The purpose or problem states the reason(s) why you are doing the experiment. Write down exactly the problem that will be investigated or experimented. Purposes can be stated as a question.

Hypothesis, Theory and Assumptions:

You should write all mathematical equations for a particular experiment as well as all definitions for specific terms. E.g., if you are going to use the term velocity in the experiment, you must write the definition for the velocity form your text book.

Assumptions are also very important for explaining the theory. In first experiment we assume that the friction form air and the wooden board is negligible.

What do you expect to find? The hypothesis can be stated as an "If..., then..." statement. The 'If' part of the statement is based on related facts that you know to be true. The 'then' part of the statement is an educated guess on the outcome of the experiment. The hypothesis does not have to guess the correct outcome, but the experiment must be set up to test the hypothesis.

Apparatus:

This is a list of all equipment and chemicals used to do the experiment. Please include quantities.

Procedure:

The procedure tells exactly what you did. Make statements in the passive voice in past tense. Be specific. The procedure you use affects the results. So, it is important to be accurate in explaining what you did. The procedure is written in paragraph form.

Data and Calculation:

The observations tell exactly what happened when you did the lab. An observation is measurable information that comes to you through your senses. Results include experimental (raw) data in the form of well-labeled tables, graphs, drawings and other observations. Place your observations and data in this section without discussion or comment. This is where you include any calculations made during the experiment.  Show calculations in a neat and orderly outline form. Include a brief description of the calculation, the equation, numbers from your data substituted into the equation and the result.

Typing the equation into the lab report is not required; it is easier and faster to print these calculations neatly by hand. If you wish to type this section, then use the equation editor in Microsoft Word.

Conclusion:

Conclusions explain your observations and describe how your data relates to the problem. It is written in paragraph/essay form and should include why you did this experiment (restate the purpose/problem). You should explain in your own words what you found out or discovered. Your conclusion should state whether or not the data confirms or rejects your hypothesis. Discuss any errors as well as any patterns you see. Part of the conclusion may be a new hypothesis based on your findings and suggestions for testing the new hypothesis in a different experiment. You may also make any predictions you would expect based on what you discovered. You must also address “What would you do to improve the experiment?”.

•  Do draw a picture of the experiment, if appropriate.
•  Don’t say that the purpose was accomplished and then say nothing substantially more. You must include data from the lab results to demonstrate that the purpose was accomplished.
• Don’t give the procedure again.
• Don’t list the data again. It was already listed in the data (chart, table, etc.). You are to discuss and draw conclusions from the data.
• Don’t forget to break up your ideas with more than one paragraph, if necessary.

Note: 

• No student should copy data from anyone who is not his or her lab partner.
• You may discuss the experiment with your lab partner and other classmates, but the lab report that you turn in must be your own work. Lab reports are subject to all the rules governing academic honesty.

Welcome 2014 Fall Chemistry

Exploring Creation With Chemistry

Sonic Boom

Newton's Cradle

Pendulum Waves

Think Relativity

Einstein's Relativity: Time Dilation

Newton's 3rd Law

Rotational Inertia Demonstration

Newton's 2nd Law

Newton's 1st Law

Rotational Inertia Demonstration

Rotational Inertia Demonstration

Lab Report for Exp. 4.1 & 4.2

Question #1
Explain why  x-motion differ from y-motion? Why both have different sound patterns ?
X-component of Projectile motion

Y-component of Projectile motion

Question #2

If both balls are same weight of 25.000g, and the stand is 1.500m high from the bench, the ball in the left hand side has only vertical motion, and the ball in the right had side has 2.500 m/s horizontal initial velocity, calculate how long each ball will take to hit the bench? Explain this situation in detail (If initial horizontal speed of the right hand side ball was 5.000 m/s, What would happen?).  

Check out http://www.walter-fendt.de/ph14e/projectile.htm and find out the answer was correct.

CIRCUS PHYSICS: PROJECTILE MOTION

Watch the full episode. See more Circus.

Lab #4 on 09/20/2013

• We all need safety goggles for this Lab. Please have them ready. 

Vector Additions in Mythbusters

Explain this scenario using vector diagram in your discussion section.

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Galileo Galilei's Leaning Tower Experiment but this time on the moon

Reference:
(Apollo 15 Commander Dave Scott demonstrates that the mass of an object does not affect the time it takes to fall, using a hammer and a feather on the Moon. Taken from Spacecraftfilms.com DVD "Apollo 15: The Great Explorations Begin". {{PD-USGov-NASA}})
This file is in the public domain because it was created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
http://en.wikipedia.org/wiki/File:Apollo_15_feather_and_hammer_drop.ogg

Lab Report for Exp. 2.1, 2.2, & 2.3

Following point should be addressed in Discussion and Conclusion section.

1. If one were performed Exp. 2.1 & 2.3 on Mass, what would be the results?
2. If one were performed Exp. 2.1 on Jupiter, what would be the results?

Jackie Sherrill accused Auburn punter Terry Daniels of filling football with helium

3) If you were used two footballs (which one of them filled with helium (He)), which one would fall quickly if the released 5m above your lab floor? 

Lab Report for Exp. 1.1 & 1.2 on Fri Aug 24th

Following point should be addressed in Discussion and Conclusion section.

    0. If you think you did a mistake in the lab, 'how do you overcome it?'

1. What is the critical measurement that you obtained in this lab experiment?
2. How to increase the time interval for a given trail? 
3. What do you expect to your final results if you used
• a very long board (about 5m)
• a very short board ( about 0.5m)
• a light ball
• a heavy ball
• a stop watch that has seconds only (does not have milliseconds) 
• a board that has uneven surface. 
4. What would you do to improve the quality of the experiment? 
5. How do you obtained reasonable results? 
6. Give a revised set of apparatus for the lab.