critical when they use sources for new materials. To help the historian by evaluating and organizing‚ the sources fall into two categories: primary sources and secondary sources. Primary sources are materials produced by people or groups of people directly involved in the event or topic under consideration‚ either as participant or as witnesses. In other words‚ primary sources are
Premium Primary source Source text Historiography
Experiment 2 Preparation of Primary Standard solutions and Standardizing Acid and Base solutions Objectives: The objective of this experiment is: 1- To prepare two primary standard solutions‚ KHP and Na2CO3 2- To standardize a sodium hydroxide solution using the prepared primary standard KHP. 3- To standardize a hydrochloric acid solution using the prepared primary standard Na2CO3. 4- To calculate the concentration of an unknown acid or base. Introduction A primary standard is a standard that
Premium Titration Sodium hydroxide Hydrochloric acid
In this essay I am going to discuss two psychological/sociological theories and one biological theory of ageing and then I will compare one psychological theory of ageing with the chosen biological theory of ageing. The first sociological/psychological theory I am going to explain is the disengagement theory. This theory suggests that as we get older we begin to withdraw from society. Social scientists Elaine Cummings and William Henry outlined the disengagement theory of ageing in their 1961 book
Premium Sociology Gerontology Old age
within the ecosystem‚ a process known as succession. Primary succession happens when species grow in locations where organisms have never previously existed. Secondary succession occurs after an ecosystem disturbance. The basic difference between primary and secondary succession is the presence of soil. When primary succession begins‚ soil is not present; in the case of secondary succession‚ soil is already in place. What occurs during primary and secondary succession? How can an ecosystem recover
Premium Ecosystem Ecological succession Organism
There are 20 teeth in primary dentition. the mixed dentition Begins at 6 to 12 there are 32 succedanous teeth the permanent dentition period begins at about 12 years of age when the last primary tooth is shed human mouth is divided into two sections or arches called the maxillary and the mandibular the mouth can be divided into four sections called quadrants canines are the longest teeth in the human dentition and are used for cutting
Premium Teeth
Employee Behaviors Positive And Negative Outcomes Business Essay Employees’ behavior mostly will lead to positive or negative outcomes; therefore‚ motivated employees play an important role in the workplace. According to Linder (1998)‚ motivated employees help organizations to be survival and adapt to the rapid changing business environment. The term of motivation could be defined to reword organization goals and satisfy the employees’ needs. There are two categories of motivation theories: content
Premium Maslow's hierarchy of needs Motivation
STACEY-LEIGH COTSFORD RESEARCH AND ACCOUNT TASK B IDENTIFY TWO REPORTS ON SERIOUS FAILURES TO PROTECT INDIVIDUALS FROM ABUSE. Abuse can happen anywhere anytime‚ but especially to vulnerable people‚ ie Children‚ elderly people‚ people with disabilities‚ people with learning difficulties. It can even happen in places people should be safe‚ ie hospitals‚ residential/ nursing homes‚ schools‚ daycare/ nurseries‚ centres etc. I researched two cases reported for abuse. The Winterbourne case which
Premium Abuse Bullying
The Functions of the Eye‚ Ear and Skin; Their Role in Behavior Vision starts with light‚ the physical energy that stimulates the eye. Light waves coming from some object outside the body are sensed by the eye; the only organ that is capable of responding to the visible spectrum. Eyes convert light to a form that can be used by the neurons that serve as messengers to the brain. The neurons themselves take up a small percentage of the total eye. Most of the eye is a mechanical device that is
Premium Auditory system Visual perception Brain
The evolutionary approach believes that human intelligence evolved due to the demands of the environment creating pressure for increased intelligence. Larger brains may have evolved to allow individuals to cope with the demands of social living. However having a large brain involves costs-larger brains use a higher proportion of an individual energy. Humans use 22% of their energy sustaining the brain compared with only 8% of chimpanzees. According to Kliniwoska‚ if brain size equated to intelligence
Premium Human brain Mammal Brain
------------------------------------------------- ------------------------------------------------- ------------------------------------------------- ------------------------------------------------- Mid Term Exam SOC323 – Deviant Behavior Week 4 Daniel Frey March 31‚ 2012 Patricia Case ------------------------------------------------- ------------------------------------------------- ------------------------------------------------- -------------------------------------------------
Premium Sociology