Molarity Definition as Used in Chemistry

In chemistry, molarity is a  concentration unit, defined to be the number of moles of solute divided by the number of liters of solution. Units of Molarity Molarity is expressed in units of moles per liter (mol/L). Its such a common unit, it has its own symbol, which is a capital letter M. A solution that has the concentration 5 mol/L would be called a 5 M solution or said to have a concentration value of 5 molar. Molarity Examples There are 6 moles of HCl in one liter of 6 molar HCl or 6 M HCl.There are 0.05 moles of NaCl in 500 ml of a 0.1 M NaCl solution. (The calculation of moles of ions depends on their solubility.)There are 0.1 moles of Na ions in one liter of a 0.1 M NaCl solution (aqueous). Example Problem Express the concentration of a solution of 1.2 grams of KCl in 250 ml of water. In order to solve the problem, you need to convert the values into the units of molarity, which are moles and liters. Start by converting grams of potassium chloride (KCl) into moles. To do this, look up the atomic masses of the elements on the periodic table. The atomic mass is the mass in grams of 1 mole of atoms. mass of K 39,10 g/molmass of Cl 35.45 g/mol So, the mass of one mole of KCl is: mass of KCl mass of K mass of Clmass of KCl 39.10 g 35.45 gmass of KCl 74.55 g/mol You have 1.2 grams of KCl, so you need to find how many moles that is: moles KCl (1.2 g KCl)(1 mol/74.55 g)moles KCl 0.0161 mol Now, you know how many moles of solute are present. Next, you need to convert the volume of solvent (water) from ml to L. Remember, there are 1000 milliliters in 1 liter: liters of water (250 ml)(1 L/1000 ml)liters of water 0.25 L Finally, youre ready to determine molarity. Simply express the concentration of KCl in water in terms of moles solute (KCl) per liters of solute (water): molarity of solution mol KC/L watermolarity 0.0161 mol KCl/0.25 L watermolarity of the solution 0.0644 M (calculator) Since you were given mass and volume using 2 significant figures, you should report molarity in 2 sig figs also: molarity of KCl solution 0.064 M Advantages and Disadvantages of Using Molarity There are two big advantages of using molarity to express concentration. The first advantage is that its easy and convenient to use because the solute may be measured in grams, converted into moles, and mixed with a volume. The second advantage is that the sum of the molar concentrations is the total molar concentration. This permits calculations of density and ionic strength. The big disadvantage of molarity is that it changes according to temperature. This is because the volume of a liquid is affected by temperature. If measurements are all performed at a single temperature (e.g., room temperature), this is not a problem. However, its good practice to report the temperature when citing a molarity value. When making a solution, keep in mind, molarity will change slightly if you use a hot or cold solvent, yet store the final solution at a different temperature.

Sex And Disability An Open Minded Perspective From...

Rarely, do we find in society, the overlapping topic of sex and disability being discussed. In fact, it is hardly ever addressed because there is an underlying notion which seems to discourage such an open minded perspective from individuals. In fact, the topic of sexual intercourse itself is seemingly discouraged. However, why is that the case? Our society has been conformed to hold such restricted societal values; such that in a way, the desire for sex is shunned upon and confronted with negativity. There is also the implication of gender roles that ties into this subject. However, the subject becomes much more complex when the matter of disability ties in. Often times, those with disabilities are almost â€Å"hidden away† from topics such as†¦show more content†¦There is a discrete difference between the definition of sex and gender. Sex, is more so, the physical differences that is noted in the human anatomy. On the other hand, gender, more so addresses the ideali zed image that is often associated with the given sex. Women are â€Å"weak†. Men are â€Å"strong†. To further analyze and add on to this definition, in Rethinking Sex and Gender, Christine Delphy addresses the terms of which â€Å"the idea that gender is independent of sex has progressed.† She then goes on to state, â€Å"the aspect of ‘sex roles’ and sexual situations that are recognized to be socially constructed rather than biologically determined† (Delphy). The idea of sex roles has been socially constructed through our moral values, rather than it being biologically constructed. Yet, where do such sex roles attribute to those with long term disabilities? Often times, the physical or intellectual disability of individuals lead them to feel less of a boy or a girl. They feel like they don’t conform to the stereotypical image of the perfect male or female. There is a lack of association of being â€Å"feminine† or â€Å"mas culine† with their own identity. In 2014, a research was conducted of men with long- term conditions to study their feelings regarding their own identity. It was concluded that the â€Å"interviewees said that they want to be sexually active but feel as if their sexuality is ignored as they are ‘genderless’† (Learning Disability Practice).Show MoreRelatedThe Impact Of Employment Law On The Human Resources Arena927 Words   |  4 Pagesyears. However, treating people with respect and dignity is not a new concept. This biblical perspective focuses on Philemon. You may recall the plea Paul had for Onesimus in Philemon 1:8-9. In this passage, we hear about doing the right thing based on our love for one another. Forgetting the past and focusing on doing the right thing in the future is a key part of this lesson. 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List some good things about stress and some bad Free Essays

List some good things about stress and some bad and try to give examples. Include short write-up about Holmes and Rahe scale on the definition of stress. The right amount of stress can be used as stimulus to bring about an improvement in performance or a more pro-active action. We will write a custom essay sample on List some good things about stress and some bad or any similar topic only for you Order Now    In the school setting, a student may be forced to study as a result of stress brought about by failing marks/failing grades.   Similarly, in the work setting, a notice of promotion, incentive or even demotion can bring about activities or outputs from an employee. However, at work or in school, too much stress can also lead to burnouts and decreased quality outputs. Over stress can affect a person’s health and emotional, physical, and psychological well-being.   Excessive stress can cause severe anxiety, work dissatisfaction, fatigue, heart ailment and other health-related problems. Stress comes about when we are faced with changes in our life.   These occurrences can be positive changes in our life, or it can be considered negative changes. Whatever their result, the fact that our equilibrium has been disturbed causes stress because they force our body to react to the stressors/factors that were introduced in our routines. According to the Holmes-Rahe Scale, different kinds of stress we encounter (whether resulting from positive or negative events) in our daily lives increase probability of illness or even death.   Values are given to correspond to these stressors.   The higher value in the scale, the higher the likelihood of illness and/or death. Give one criticism of the Holmes and Rahe live events scale as a means of measuring stress. In studying the scale, it can be observed that some positive stress are given points/score almost equal to negative stress. I believe that this should not be the case because we have a sense of what affects us positively or negatively, and happy events are not destructive at all. A specific example is the score for Reconciliation in Marriage is 45 while Dismissal from a Job is scored 47.   Reconciliation with loved ones usually brings a happy feeling. Happy events should not be considered as factors causing our illness.   In fact, joyous events provide us with inspiration and an eagerness to live our lives to the fullest. 1 of the factors that increase stress in commuters is the delays caused by traffic jam suggest 1 other factor in commuting that will cause stress. Aside from the delays caused by slow moving traffic, another stressor is the feeling that your plans/objectives for the delay are being slowed down by the traffic.   This feeling of non- attainment is also causing stress. Name two life events which are known to cause stress in humans. There are many life events/universal events in a person’s life that brings about stress. This may be related to change in work setting or responsibilities or it may be health-related. To name two life events, one is personal/loved one’s illness and death or loss of a loved one. Describe 2 psychological effects of stress. Two psychological effects of stress include anxiety and nervousness which may lead to bodily health risks such as heart ailments from high blood pressure, and possibly adult diabetes.   There are also some instances of memory loss as a result of stress. What is one advantage of the stress response? One advantage of stress response is being able to react to stress.   This reaction can become positive actions that will benefit the individual and provide enthusiasm in a particular task.   An example would be an individual â€Å"stressed† from a marital reconciliation would probably approach his mornings happier and his more energetically.   He would also be more pleasant to friends and acquaintances, all because of the current change in his routine life (life without his wife to share insights with). Outline an example from everyday life when an increased physiological arousal has positive effect on a person. One example from everyday life is when a person is driving and hits a bump in the road making him more alert to what he is doing.   This alertness is a physiological arousal that makes him more attentive to driving, which results in a safer road trip. The general adaptation syndrome has 3 phases: stage of resistance stage of exhaustion, and alarm reaction, place them in correct order. The first stage in the GAS syndrome is the Alarm reaction where the body’s reaction to stress is immediate such as body movement or motion. Alarm reaction usually happens when the body is exposed to sudden or instantaneous stress. The second stage in the syndrome is the stage of resistance where the body tries to resist or adapt to the stressor hoping to diminish its effects.   When the body gets tired/can no longer resist the stress, the third stage, the Stage of Exhaustion, comes into play. According to the Yerkes Dodson Law, what happens to performance as arousal increases? Based on the Yerkes Dodson Law, your performance will improve when arousal increases.   But a person’s stress tolerance will only be to a certain extent.   Too much stress will also cause poor performance. According to this Law, stress should be applied moderately to obtain optimum performance level. The term locus of control refers to how much control individuals believe that they have over the events that happen to them. What effect does locus of control have on stress? There are two types of locus of control perceived by an individual. One is internal locus of control where the individual feels that most if not all events that happen are influenced by his own activities/actions while external locus of control is where the individual feels that all events is not directly affected by him. Internal and external locus of control is two ends of a rope. The higher the internal locus of control, the lower an individual perceives his external locus of control. Based on abstracts of Occupational Studies, research showed that higher the external locus of control perceived, the higher stress comes into play.   This implies that the more the person feels he is not in control of the events happening around him, the higher the stress, the more he becomes stressed-out, which results in higher job dissatisfaction, and ultimately job burn-out. Describe 2 emotion-focused strategies for reducing stress. Two emotion-focused strategies for reducing stress is by avoidance of cognitive attention from the source of stress, and by altering the perception of the individual by positive thinking. Not focusing on something stressful somehow controls/minimizes a person’s reaction to this stressor.   Likewise, positive thinking approach to â€Å"stressful† things can help in reducing stress by changing the individual’s perception of what are considered stressful. Sources: By David Fontana, D. (1989).Stress. From Managing Stress, The British Psychology Society and Routledge, Ldt Retrieved on June 6, 2007 from http://honolulu.hawaii.edu/intranet/committees/FacDevCom/guidebk/teachtip/stress.htm Shwartz, M. (2007). Robert Sapolsky discusses physiological effects of stress. Stanford Report 2007 Retrieved on June 6, 2007 from http://news-service.stanford.edu/news/2007/march7/sapolskysr-030707.html Hennessy, D.W. et.al The Influence of Traffic Congestion, Daily Hassles, and Trait Stress Susceptibility on State Driver Stress: An Interactive Perspective Retrieved on June 6, 2007 from http://72.14.235.104/search?q=cache:sS1BKtW4pwUJ:www.bellpub.com/jabr/2000/th000206.pdf+stress+from+traffichl=enct=clnkcd=1gl=ph Heathfield,S.M.(2007).Understanding Stress and Workplace Stress. Retrieved on June 6, 2007 from http://humanresources.about.com/od/stressandtimemanagement/a/stress_time.htm Zuck, M.V. (2002).General Adaptation Syndrome. Gale Encyclopedia of Medicine, Published December, 2002 by the Gale Group Retrieved on June 6, 2007 from http://www.healthatoz.com/healthatoz/Atoz/common/standard/transform.jsp?requestURI=/healthatoz/Atoz/ency/general_adaptation_syndrome.jsp Bambrick, L. (2006). The Yerkes-whatzy law of who now? Retrieved on June 6, 2007 from http://secretgeek.net/ydlaw.asp Rahim, MA (1995).A comparative study of entrepreneurs and managers: stress, burnout, locus of control, and social support. J Health Hum Serv Adm. 1995 Summer;18(1):68-89. Retrieved on June 6, 2007 from www.ncbi.nlm.nih.gov/sites/entrez?cmd=Retrievedb=PubMedlist_uids=10152341dopt=Abstract Jain, V.K., et.al. (1996). Effects of locus of control, occupational stress, and psychological distress on job satisfaction among nurses. Psychol Rep. 1996 Jun;78(3 Pt 2):1256-8. Retrieved on June 6, 2007 http://www.ncbi.nlm.nih.gov/sites/entrez?cmd=Retrievedb=PubMedlist_uids=8816047dopt=Abstract Behson, S.J.Informal Work Accommodations to Family: A Potential Coping Strategy for Reducing the Stress Associated with Work-Family Conflict among Professional Employees. Retrieved on June 6, 2007 from http://www.chrms.org/library/informal/inform1a.htm How to cite List some good things about stress and some bad, Essay examples