Are Glow Sticks Endothermic or Exothermic

Glow sticks give off light  but not heat. Because energy is released, the glow stick reaction is an example of an exergonic (energy-releasing) reaction. However, it is not an exothermic (heat-releasing) reaction because heat isnt released. You can think of exothermic reactions as a type of exergonic reaction. All exothermic reactions are exergonic, but not all exergonic reactions are exothermic.   Endothermic reactions absorb heat. While glow sticks dont absorb heat and arent endothermic, they are affected by temperature. The rate at which the chemical reaction proceeds slows as the temperature is reduced and speeds as the temperature is increased. This is why glow sticks last longer if you refrigerate them. If you place a glow stick in a bowl of hot water, the rate of the chemical reaction  will be increased. The glow stick will glow more brightly, but it will stop working more quickly. If you truly want to classify the glow stick reaction, its an example of chemiluminescence. Chemiluminescence is light produced from a chemical reaction. It is sometimes called cool light because heat does not need to be produced. How a Glow Stick Works A typical glow stick or light stick contains two separate liquids. There is a hydrogen peroxide solution in one compartment and a  phenyl oxalate ester with a fluorescent dye in another compartment. When you snap the glow stick, the two solutions mix and undergo a chemical reaction. This reaction does not emit light, but it produces enough energy to excite the electrons in the fluorescent dye. When the excited electrons fall from a higher energy state to a lower energy state, they emit photons (light).  The color of the glow stick is determined by the dye that is used.

Essay about Human Resources Today - 1141 Words

Given todays employment environment we need to take a new and fresh looks at our Human Resource departments policies, procedures and plans so that we can maintain and enhance our human capital. Human resources need to do more than just basic administrative functions so we would like to go beyond that scope and take on a strategic role in our company. We propose to do this by viewing our Human Resource department as a customer service center where our employees are our customers. This report will examine this philosophy; its ramifications within our organization and what specifically we would have to do to implement this mindset in Human Resources. Here at XYZ Company, We are proud of our strong reputation for providing superior†¦show more content†¦When good employees have a high level of expertise in their departments, the goal is to retain their talent for as long as possible. We must work diligently to maintain a high level of morale and positive attitudes with our existing employees. Active disengagement of some workers can lead to lost productivity and lower morale among all employees of XYZ Company. In order to alleviate the problems associated with employee dissatisfaction, we will be implementing a policy of applying our proven customer service techniques to our workforce. We think a great way to look at customer service is; meeting the expectations of the customer as defined by the customer. So we want to treat our employees as our customers (internal customers if you will) and meet the needs and expectations of these customers as they define these needs and expectations. We will have to look at our entire Human Resource department to see where the employee/customer might have needs and expectations, decide how to determine these expectations and formulate a plan to meet these expectations. We will also look at how these changes will help us meet our corporate objectives and help lead us towards our new goal of being a strategic player in our corporate environment. Let us begin by taking a look at the human resource functions and identify the probable areas for implementing our customer service plan. In our organization we view the human resources (or human management)Show MoreRelatedHuman Resource Management And The Business World Today1546 Words   |  7 PagesHuman Resource Management is very important in the business world today. Human resource management is attracting, developing, and maintain a quality work force. There are a few problems that arise when on the topic of Human Resource Management. The first is: â€Å"HR Managers focus too much on administrivia and lack vision and strategic insight† (Cappell, 2015, pg. 56). 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Argument Summary Free Essays

Taking a Blue Book Exam is a Social Practice According to Literacy Practices by David Barton and Mary Hamilton, literacy is a social practice. To explain this, Barton and Hamilton point out literacy Is how people discuss and interpret written text. Literacy practices are described to us by Barton and Hamilton as â€Å"in the simplest sense literacy practices are what people do with literacy† (8). We will write a custom essay sample on Argument Summary or any similar topic only for you Order Now Literacy practices eventually lead to literacy events which are defined as observable episodes which arise from practices and are shaped by them. The notion of events stresses the situated nature of literacy and that it always exists in a social context† (8). Text Is crucial In molding our Institutions Into what they are and literacy is deeply rooted in our everyday lives in unexpected ways. In their essay, Barton and Hamilton present to us six propositions to further prove the nature of literacy as a social practice. Next, I will share a literacy event that adheres to two of those propositions. My first semester of college had started and I was feeling confident and determined to do well. Although I was fresh out of high school. I didn’t doubt my abilities. In all honesty, I underestimated the difficulty of college due to the college courses and advanced placement courses I’d taken throughout my high school career. It was a simple and short-lived time. Then, I was Introduced with a bluebook test. You see, multiple choice, fill in the blank, matching, and true or false worked just fine for me. But when my history professor told us to buy a bluebook, I had no Idea what to expect. When I went hunting for this said bluebook, most people didn’t even now what it was! I went to Walter, office supply stores, book stores, and no one knew what I was talking about Finally. I found one In the campus store and when I opened it, blank pages stared back at me. Even though we went over what was to be expected on the test in class, I was still concerned. How am I supposed to succeed at something so foreign to me? Well. I spent a lot of my time just studying the best I could. And then I had an idea. I took my extra bluebook (which I’d bought for my second exam in the course) and I took a list of topics and began writing. The best way to see how to fill these pages with information is to do so without material in front of me as if I were taking the exam in my own home. Secondly, I went through my notes and asked myself the series of who, what. Where, when and why for each event. After discovering some new study tactics, I realized that not much had actually changed. The only deference between this dreaded bluebook test and a high school test Is that I have to communicate to my professor that know the material without a written medium such as a structured question. Instead, I simply had to write down everything I know about the topic and hopefully point out the aspects and details There are two of the six propositions from Barton and Hamiltonians Literacy Practices that apply to this literacy event. The first is, â€Å"literacy practices are purposeful and embedded in broader social goals and cultural practices† (8). My goal is, of course, to get the best grade possible on this test. However, there is a broader goal that applies here as well. I want to do well in college and gain knowledge that could potentially be useful to me later in life. The second proposition from Barton and Hamilton that applies to my literacy event is, â€Å"literacy practices change and new ones are acquired through process of informal learning and sense making† (8). By leaving high school and entering college, I am acquiring a new literacy. At first, I was mistaken by thinking college would be the same level of difficulty as high school and I later realized I needed to change and adapt in order to be successful in my new environment. A bluebook test is not the only aspect of college that was new to me. In fact, there are continuously new things for me to learn here. Like the bus system, the campus alert system, being aware of traffic so I can predict my commute time, balancing a school schedule I’m not used to with my work schedule, trying to make friends with classmates, and even simply discovering the direction I really want to go in my life. Barton and Hamilton were right; I had acquired new literates and I had broader goals beyond that bluebook test. There are literacy practices, literacy events and those propositions prove true to me. Literacy is a social practice and I understand that now, thank you to Barton and Hamilton. How to cite Argument Summary, Essays