The Rate of Diffusion Essay Example for Free

The Rate of Diffusion Essay Abstract I found that this experiment gives me an understanding on how osmosis and  diffusion works. In its simplicity, it explains the process that our bodies (mainly cells)  use all the time. It also showed me that even with the temperature changing, it doesnt  drastically change the rate of diffusion. Introduction Diffusion is important in all living systems. Osmosis is the passage of water from a region of high water concentration through a semi-permeable membrane to a region of low water concentration (Purchon 1). Diffusion is the movement of a substance from an area of high concentration to low concentration (Biological 21). With this knowledge we tried to recreate diffusion for students to understand the process. The dialysis bags represented our selectively permeable membrane with the fluid inside it, sucrose. How much of the substance moves from the cup to the bag quickly depends on the temperature of the substance. The class used four different temperatures to measure the rate of diffusion. I thought that the rate of diffusion would increase as temperature increased because the more heat put into the process the quicker the molecules will move. The null hypothesis is that no matter what the temperature is the rate of diffusion will stay the same. Materials and Methods The materials used were a dialysis bag, string, pipet, beaker with water, 10% sucrose water, and a balance. The variables that we made standardized were the concentration of the solute, length of the dialysis bags, and time. Each group poured 10 milliliters of 10% sucrose into two 15 cm long dialysis bags and bent the end of the bags and tied them. Then the bags were immersed in water, dried, and measured. Next the bags were put into room temperature (about 20 °C), 60 ° C, 45 °C, or ice water (0 °C). Each group measured the bags three more times at 10 minute intervals drying them off each time. Once they finished, each group subtracted the final measurement from the initial to see how quickly the water diffused into or out of the bag. My partner and I did the experiment twice, once with ice water and the next in room temperature water. We had two dialysis bags for each of the two experiments that we did. The independent variable is ______________. The dependent variable is __________. Results The first two tables are the information that my partner and I got through our two experiments. The data from our experiments show that the rate of diffusion was faster with the room temperature water. The last table shows the classs data. The classs results show that the rate of diffusion occurs the fastest in room temperature water. Both my data and the rest of the classs data show that the rate of diffusion is fastest in room temperature water. The overall total weights of the dialysis bags immersed in room temperature water weighed the most which shows the rate of diffusion being the fastest in those experiments. Table 1 Graph 1: The Change in weight of the 2 diallysis bags of 10 ml of 10% sucrose left in ice water (2 °C). Time in minutes Weight of 1st bag in grams Weight of 2nd bag in grams 0 10.93 10.89 10 11.49 11.28 20 11.76 11.66 30 12.05 11.94 Total weight gained in each bag 1.12 1.05 Table Graph 2: The change in weight in the 2 dialysis bags of 10ml of 10% sucrose left in room temperature water (21 °C). Time in minutes Weight of 1st bag in grams Weight of 2nd bag in grams 0 10.92 10.92 10 11.56 11.45 20 12.08 11.90 30 12.56 12.35 Total weight gained in each bag 1.64 1.43 The change in weight in the 2 dialysis bags of 10ml of 10% sucrose left in room temperature water (21 °C). Table Graph 3: Each groups change in weight of each of the dialysis bags in the different types of water. 21-23 ° C Room Temperature 47-49 ° C 59-60 ° C 2 ° C ice water -1.77 .03 -0.30 .24 .16 .20 -0.38 .61 .34 .28 .06 .76 .35 .40 .16 .77 .42 .68 .56 .88 .76 .73 .75 .93 1.01 .89 .76 .96 1.05 2.06 .83 1.01 1.60 2.21 1.14 1.02 1.12 1.25 1.03 1.12 1.42 1.05 1.33 1.12 1.39 1.19 1.42 1.30 1.43 1.34 1.47 1.45 1.52 1.56 1.61 1.64 1.75 1.78 Total Average weight gain 1.05 overall 0.83 0.57 0.98 Each groups change in weight of each of the dialysis bags in the different types of water. Discussion The data seems to agree with me in the fact that the rate of diffusion was the quickest in the room temperature water. My partners and my experiments average was 1.085 grams with the ice water and 1.53 with the room temperature water. This shows that the rate of diffusion was faster in the room temperature water, but not by much; it only had 0.445 grams more than the bags that were in ice water. In the classs experiments, the bags in room temperature water only weighed 0.07 grams more than the bags in ice water. The bags in the 47-49 ° C range came as third fastest, leaving 59-60 ° C range dead last. They varied by 0.26 grams. Overall the rate of diffusion didnt make a huge jump in any certain temperature change in the water. It changed slightly, but not enough to make quite an impact on the process. This data also shows that there wasnt much change overall between room temperature water, ice water, and the 47-49 ° C water. The problem with this data is the class chart. It seems as though overall people messed up in very common ways. Some of the data were in the negative which probably means they either didnt tie the dialysis bag tight enough or poked a whole in the bag. Also, some people didnt have enough  time to complete the experiment at the correct interval time.

images of gender in the media Essay -- essays research papers

Finding a simple or concrete definition of gender maybe near impossible. Gender roles are what men and woman learn and internalize as the way they are supposed to act. These roles are commonly thought of as natural rather than a construction of culture. Gender is thought to flow from sex, rather then being a matter of what the culture does with sex. This theory is widely and exhaustively debated, according to Wood â€Å"Sex is based on biology; Gender is socially and psychologically constructed† (Wood 19). This statement suggests that culture’s discourses and ideologies form the complexities of gender and gender roles. It is easy to say that girls are made of sugar and spice and everything nice and boy are made of snips and snails and puppy dog tails, but we are actually more intricate then that.   Ã‚  Ã‚  Ã‚  Ã‚  To understand gender, it is necessary to understand the distinction between sex and gender. Sex is defined by the physical body and is characterized by the initial biological structure from birth. The characteristics of each male or female body maybe different but the make ups are the same. Gender on the other hand according to Wood is unstable; it is a category or a means by which we understand the body. The cultures ideologies and discourses surrounding us make sense of the body and determine our gender in multiple ways. It gives us a social, political, symbolic, and economic understanding of our bodies and how they are similar and dissimilar from other bodies. Because culture is a living entity and is always advancing it allows gender roles the ability to change with the culture. The idea of what a woman should be and how and what she can do has changed. Women are now able to do things such as vote and support their own families in our modern culture when in th e past it was thought to be inconsistent with the expected behaviors of the gender. Culture also varies greatly from one to another and there for so does the idea of gender throughout the world. Considering the evolution of what is considered acceptable gender behavior throughout cultures it stands as a reasonable conclusion that gender is neither based on or found in nature, but is rather constructed by its inhabitants. We are surrounded by ideologies and discursive examples that suggest how men and women should act and how they should look like in comparison to one another. Thes... ...ure is so used to seeing woman on display is what makes this ad so subversive. When you realize that the person on the screen is a man you are surprised at such image so far from the norm. The culture is not normally put in the position to view a man in a sexual way. When someone is viewed in a sexual way is it can give a sense of power to the viewer, as if the person being viewed is just a piece of meat. Seeing Joe Namath posing with pantyhose on switches the power roles, now he is on display in a sexual manner rather then a woman. The Namath ad relies on the deeply entrenched and prescribed values associated with each gender, and without the near universal understanding of masculine and feminine roles the ad would cease to make sense. The poignancy of the ad is made by displacement of character, gender, biological sex. When the ad starts at the toes of Namath (the model) the scenario is set for another image enhancing commercial for a woman’s product, but when Namath’s face appears on camera as the main and only spokesperson for the product there is an initial sense of shock and surprise that makes the message of the ad and the cognitions of the viewer converge and coalesce.

Solving Problems

In this essay, I will solve two problems from our textbook Elementary and Intermediate Algebra; I will solve problem 56 on page 437 and problem 10 on page 444. For my first problem, I will choose an appropriate variable to help solve the equation, for my second equation I will identify the form of the equation I end up with once it is solved. I will also introduce five math vocabulary words, they are, extraneous, proportion, cross multiply, and extreme-means and the will be in bold.Problem number 56 states: To estimate the size of the bear population on the Keweenaw Peninsula, Conservationists captured, tagged, and released 50 nears. One year later, a random sample of 100 bears included only 2 tagged bears. What is the conservationist’s estimate of the size of the bear population? This is a ratio equation and my variable will be b, b= bear population b =10050 2 2*b= 50*100 cross multiply the extreme-means 2b=5000 b= 5000 2 b= 2500 bears 2500 is the conservationist’s est imation of the bear population. This equation is not an extraneous solution because the denominator does not equal zero.Problem number 10y-1= -3 this problem is a proportion x+3 4 (y-1)*4=(x+3)-(-3) cross multiply the x and y which are the extreme and means 4y-4=-3x-9 distribute the 4 and the -3 4y=-3x-9+4 add 4 to both sides 4y=-3x-5 divide both sides by 4 y= -3 x-5 both of these fractions are in parentheses the x and – are outside the () 4 4The linear equation in the form of y=mx+b with the slope of -3,  4This essay discussed two problems from our textbook Elementary and Intermediate Algebra. It introduced five vocabulary words to help explain the steps in solving the two problems, those vocab words are extraneous, proportion, cross multiply, and extreme-means. This essay identified the variable in problem one, and identified the form of the equation in problem two.Reference Dugopolski, M. (2012). Elementary and intermediate algebra (4th ed.). New York, NY: McGraw-Hill Pu blishing.

The Treatment Of Schizophrenia Varies - 1499 Words

The treatment of schizophrenia varies. Many patients are treated with drug. Current treatment modalities are somatic and psychotherapeutic which were performed in many different ways that associates with drug treatment. The somatic treatments for schizophrenia are all based on drug therapy and pharmacology (de Meduna). Of course, there have been previous approaches of treatment. Psychosurgery, which had been rejected, includes electro convulsive therapies, insulin coma, and various treatment that involved immersion in hot or cold baths. The pharmacological therapies currently applied all have scientific proof of their effectiveness, although the results of these studies have also provided that when drugs are stopped, relapse may occur†¦show more content†¦However, patients responds in different ways. The patients may have to try more than one medication to find the right dose. Neuroleptics drugs have different effects on various symptoms of schizophrenia. Positive symptoms are the ones which are affected by the drugs, hallucinations and some communication disorders are some examples. The negative symptoms are merely affected because it is believed that most negative symptoms are somewhat associated with positive symptoms (Kane). Social deficits are caused by patient s experience of positive symptoms. For example, patients experience intense anxiety from their hallucination which makes it difficult for them to have normal conversations with other people. So whenever, hallucination goes away so does the anxiety problem. Finding the right treatment takes time. Treatment with neuroleptic medication may instantly work for the patients. Studies suggested that within few days of application of the drug treatment, the symptoms occurrence reduce and positive symptoms which usually occurs for over 7 weeks and in the first week of treatment (Rosenheck). Drug treatment is by far the most effective treatment of schizophrenia. This treatment had reduced many symp toms of the disease (Grohol). The future development will also be prevented. Future drug treatment of schizophrenia will follow a more rational and sensible course, one based on better of how drug will be acting based on how the brain functions. Direct inquiries