Purpose:
Chemistry is the study of matter and the change it undergoes. The change is divided up into two classes, chemical change and physical change. In a physical change, one or more physical properties of a substance are altered without their being any new substances formed as a result. Some examples of physical properties include, size, shape, color, and physical phase. An example of a physical change is melting an ice cube.
A chemical change results in the formation of one or more of new substances. These new substances change the chemical properties and composition from the original substance. A chemical change is a creation of a new product and usually is irreversible. Some chemical properties include oxidation, flammability, heat of combustion, and reactivity with other chemicals. An example of a chemical change is the formation of rust on iron.
The purpose of this lab is to be able to distinguish these physical and chemical changes and describe the changes in detail using observation skills.
Procedure:
1. After sorting out my supplies, I put my safety goggles on as well as a pair of protective gloves.
2. I took the 24- well plate and began filling a well half way with 6 M HCl and a second well on the same plate filling it also half way, but this time I used 6 M NaOH. To ensure accuracy I was playing close attention to the placement of these chemicals in the well plate. I took the pipets labeled “HCl” and “NaOH” and used it to suck up the proper chemical that matched the labeled pipet.
3. I gathered four small test tubes, the 24- well plate used previously, and each of the substances to be tested. I placed the micro test tubes into the wells of the 24- well plate. In this lab the substances I am testing in the order are Magnesium (Mg), Copper (Cu), Zinc (Zn), Magnesium Oxide (MgO), Copper Carbonate (CuCO3), Copper Nitrate (CuNO3)2, and Sodium Chloride (NaCl).
4. For each of the four test tubes there are four different steps required. I took ONE of the substances and placed small amounts into each of the test tubes. I then followed the four steps I listed below.
My test tube #1 is always first on the left side when referring to anatomical positioning.
Test Tube #1:
I examined and noted the color and order of the substance.
I obtained a box of matches and lit the burner fuel wick. Picking up the test tube with a clamp, I then cautiously heated the sample slightly above the flame. I allowed the test tube to cool off before placing it back into the well plate preventing the plastic to melt.
Test Tube #2:
Using the pipet I added cold water to the second test tube, just enough to cover the substance that I was testing. Picking up the test tube with the clamp, I cautiously held the test tube slanted slightly on an angle (away from myself) so the flame was directed to the top of the water just long enough that it began to boil, observing the solubility in hot water.
I tore off a small piece of red and blue litmus paper. After the solution cooled, I took the glass stirring rod and transferred a small drop of the solution onto the litmus paper. After noting my results, I cleaned off the stirring rod.
Test Tube #3:
I grabbed the pipet that was set aside previously that was labeled HCl and added about 6 drops to the sample and followed by stirring the sample. For safety precautions, I held the test tube with a test tube holder in case I was to experience an exothermic reaction. After recording my reactions, I cleaned the glass stirring rod.
Test Tube #4:
I took the other pipet set aside labeled NaOH and added also about 6 drops to the sample and followed by stirring the sample.
security code, is acclimated to process your payment. Actual credit or debit card numbers are never shared by Apple with any merchants or transmitted with payment. Even if you lose your device or it was stolen, you can quickly put your device in Lost Mode to suspend Apple Pay, or you can wipe your device clean completely. Product Life Cycle Introduction Stage During the introduction stage of the service, the launching could cost the company; this can be a very expensive process. This is due to the…
class notes). Within communication, there are various theories about it that is included for it be effective and understood clearly on each receiving end. A man called Michael Argyle, born in 1925; was a social psychologist who focused on the study of interpersonal behaviour, social skills and body language of individuals. In which he closely looked at the interaction between those individuals and how they relate to each other. He was mainly interested in and channelled his focus onto nonverbal…
'Explain the moral issues surrounding the right to a child (25)' When considering the moral issues surrounding the right to have a child, there are multiple problems to consider. Firstly, when using a surrogate, we have to evaluate whether it is morally correct to use another human being for nothing more than their ability to carry a child in their uterus. This would link to Categorical Imperative created by ethical thinker Immanuel Kant, as this woman is being used as a means to an end, which in…
1. What items are typically included in a job description? What items are not shown? Information in a job description includes: job title, job summary, relationships, responsibilities and duties, job authority, standards of performance, working conditions and responsibilities, and working conditions and physical environment. Items that are not shown on a job description include 2. What is a job analysis? How can you make use of the information it provides? A job analysis is a process to identify…
Test 1 1. Explain-Benefits Argument in Baby Theresa’s case Baby Theresa was born with condition called Anencephalic, a genetic disorder that causes infants to be born without some parts of the brain such as cerebrum and cerebellum. Most of the time, babies with these conditions do not survive labor or are stillborn. Before Baby Theresa was born, her parents decided to donate her organs to children that would benefit from the organs. This decision brought a great controversy, in which it was widely…
In this essay I will outline the relationship between stress, anxiety, habits and phobias and describe how they would be treated with Hypnotherapy. Stress and anxiety are conditions that numerous people suffer with in today’s society. Modern society can comprise of a fast pace, long working hours and high pressured jobs. Over time a fast pace of life combined with sometimes self conflicted pressures can result in conditions such as stress, anxiety, habits and even phobias. At some point in a person’s…
Daniella Rogers Memorandum and Case Brief PA401 Advanced Legal Writing Professor Gill Kaplan University April 3, 2015 memorandum to: Senior Attorney from: Paralegal subject: Jane’s Asylum Case date: Statements of Facts: Jane is a 14-year old minor Canadian, she is neither a citizen of the United States nor a dual citizen of any countries. Jane’s parents have been divorced for six years in which they have shared full custody and parental rights. She lives with her father, John, in…
Teen Pregnancy SOC/100 January 2, 2015 Teen Pregnancy A growing epidemic, teenage pregnancy, affects many families. In some case, many teenagers want to have babies or are uneducated about birth control. Parents and families of these teenagers seek blame in the education system, the government, or peer pressure. Who is to blame? What follows explains a survey conducted to gain insight on the social responses of teenage pregnancy and education. The team interviewed 16 personnel between the ages…
for gynecological disorder her friend told her that if a woman doctor had treated her she wouldn’t have been embarrassed. Her friend insisted her to study medical school. Elizabeth first thought was no to become a doctor but later on her thoughts changed. Others friend’s of hers discouraged her even though they discouraged her she chose to study medicine. Her best choice was to disguise herself as a man and move to France and then she would…