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CATEGORY: | Sabtu, 27 Februari 2010
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Bagaimana komposisi unsur pembentuk senyawa? Perhatikan data percobaan pada Tabel 2, reaksi antara oksigen dan hidrogen menjadi air:
Tabel 2. Data percobaan reaksi antara oksigen dan hidrogen menjadi air

1. Hitunglah perbandingan massa hidrogen dan oksigen dalam senyawa air pada percobaan 1,2,3,4, dan 5. Bagaimana hasilnya?
2. Apa yang terjadi jika massa hidrogen dan oksigen yang direaksikan tidak sesuai dengan perbandingan tersebut?
3. Apa kesimpulan anda tentang perbandingan unsur dalam suatu senyawa?

Air tersusun dari hidrogen dan oksigen. Dari perhitungan yang telah anda lakukan ternyata perbandingan massa hidrogen dan oksigen dalam senyawa air adalah tetap, yaitu 1: 8. Jika massa hidrogen dan oksigen yang direaksikan tidak sesuai dengan perbandingan tersebut maka akan terdapat sisa salah satu unsur. Jadi perbandingan massa unsur-unsur dalam suatu senyawa adalah tetap. Pernyataan ini dikenal dengan hukum perbadingan tetap.

Rumus Kimia
Suatu atom tunggal dapat dilambangkan dengan lambang unsur. Kecenderungan atom-atom untuk membentuk molekul atau ion menyebabkan perlunya suatu notasi yang disebut rumus kimia. Rumus kimia suatu zat memuat informasi tentang jenis unsur dan jumlah atau perbandingan atom-atom unsur penyusun zat.

Secara umum, rumus kimia dinyatakan dengan lambang unsur dan angka indeks. Lambang unsur menunjukkan jenis unsur sedangkan angka indeks menunjukkan jumlah atau perbandingan atom-atom unsur. Angka indeks ditulis sebagai subskrip setelah lambang unsur. Rumus kimia dibedakan menjadi rumus molekul dan rumus empiris.


Rumus molekul
Kolom kedua pada Tabel 3, adalah rumus molekul. Rumus molekul merupakan gabungan lambang unsur yang menunjukkan jenis unsur pembentuk senyawa dan jumlah atom masing-masing unsur. Misalnya, sukrosa mempunyai rumus C12H22O11. Rumus tersebut menunjukkan bahwa sukrosa tersusun dari karbon, hidrogen, dan oksigen. Rumus tersebut juga menunjukkan bahwa satu molekul gula tersusun dari 12 atom karbon, 22 atom hidrogen dan 11 atom oksigen.

Vitamin C tersusun dari unsur C, H, O seperti penyusun gula, tetapi jumlah atom penyusunnya berbeda. Vitamin C mempunyai rumus C6H8O6, setiap satu molekul vitamin C mengandung 6 atom karbon, 8 atom hidrogen, dan 6 atom oksigen. Meskipun gula dan vitamin C tersusun dari jenis unsur yang sama tetapi mempunyai sifat yang berbeda, hal ini disebabkan karena jumlah masing-masing unsur dalam senyawa tersebut berbeda.

Urea merupakan pupuk yang telah lama digunakan. Urea mempunyai rumus senyawa CO(NH2)2. Dari rumus senyawa tersebut dapat ditunjukkan bahwa urea tersusun dari unsur karbon (C), oksigen (O), nitrogen (N) dan hidrogen (H). Dalam satu molekul urea terdapat 1 atom karbon, 1 atom oksigen, 2 atom nitrogen dan 4 atom hidrogen.
Tabel 3. Beberapa contoh rumus molekul


Rumus empiris
Rumus empiris adalah rumus kimia yang menyatakan perbandingan atom-atom yang paling kecil (sederhana). Glukosa mempunyai rumus molekul C6H12O6 dengan perbandingan C: H: O = 6: 12: 6. Perbandingan ini dapat disederhanakan menjadi C: H: O = 3: 6: 3. Perbandingan tersebut masih dapat disederhanakan lagi menjadi C: H: O = 1: 2: 1. Perbandingan ini merupakan perbandingan yang paling kecil, sehingga rumus empiris dari glukosa adalah CH2O.

Jika suatu senyawa mempunyai rumus molekul dengan perbandingan atom-atom yang tidak dapat disederhanakan lagi, maka rumus empiris sama dengan rumus molekulnya. Contohnya air H2O, karbon dioksida CO2, asam sulfat H2SO4. Tabel 4 menunjukkan beberapa contoh rumus empiris.



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CATEGORY: |
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Education or teaching in the broadest sense is any act or experience that has a formative effect on the mind, character or physical ability of an individual. In its technical sense education is the process by which society deliberately transmits its accumulated knowledge, skills and values from one generation to another.

Etymologically the word education contains educare (latin) "bring up" which is related to educere "bring out", "bring forth what is within", "bring out potential" and ducere "to lead".

Teachers in educational institutions direct the education of students and might draw on many subjects, including reading, writing, mathematics, science and history. This process is sometimes called schooling when referring to the education of teaching only a certain subject, usually as professors at institutions of higher learning. There is also education in fields for those who want specific vocational skills, such as those required to be a pilot. In addition there is an array of education possible at the informal level, such as in museums and libraries, with the Internet and in life experience. Many non-traditional education options are now available and continue to evolve.

The right to education has been established as a basic human right: since 1952, Article 2 of the first Protocol to the European Convention on Human Rights obliges all signatory parties to guarantee the right to education. At world level, the United Nations' International Covenant on Economic, Social and Cultural Rights of 1966 guarantees this right under its Article 13.

Adult education
Main article: Adult education

Adult education has become common in many countries. It takes on many forms, ranging from formal class-based learning to self-directed learning and e-learning. A number of career specific courses such as veterinary, medical billing and coding, real estate license, bookkeeping and many more are now available to students through the Internet.
Alternative education
Main article: Alternative education

Alternative education, also known as non-traditional education or educational alternative, is a broad term that may be used to refer to all forms of education outside of traditional education (for all age groups and levels of education). This may include not only forms of education designed for students with special needs (ranging from teenage pregnancy to intellectual disability), but also forms of education designed for a general audience and employing alternative educational philosophies and methods.

Alternatives of the latter type are often the result of education reform and are rooted in various philosophies that are commonly fundamentally different from those of traditional compulsory education. While some have strong political, scholarly, or philosophical orientations, others are more informal associations of teachers and students dissatisfied with certain aspects of traditional education. These alternatives, which include charter schools, alternative schools, independent schools, and home-based learning vary widely, but often emphasize the value of small class size, close relationships between students and teachers, and a sense of community.
Indigenous education

Increasingly, the inclusion of indigenous models of education (methods and content) as an alternative within the scope of formal and non-formal education systems, has come to represent a significant factor contributing to the success of those members of indigenous communities who choose to access these systems, both as students/learners and as teachers/instructors.

As an educational method, the inclusion of indigenous ways of knowing, learning, instructing, teaching and training, has been viewed by many critical and postmodern scholars as important for ensuring that students/learners and teachers/instructors (whether indigenous or non-indigenous) are able to benefit from education in a culturally sensitive manner that draws upon, utilizes, promotes and enhances awareness of indigenous traditions

For indigenous students or learners, and teachers or instructors, the inclusion of these methods often enhances educational effectiveness, success and learning outcomes by providing education that adheres to their own inherent perspectives, experiences and worldview. For non-indigenous students and teachers, education using such methods often has the effect of raising awareness of the individual traditions and collective experience of surrounding indigenous communities and peoples, thereby promoting greater respect for and appreciation of the cultural realities of these communities and peoples.

In terms of educational content, the inclusion of indigenous knowledge, traditions, perspectives, worldviews and conceptions within curricula, instructional materials and textbooks and coursebooks have largely the same effects as the inclusion of indigenous methods in education. Indigenous students and teachers benefit from enhanced academic effectiveness, success and learning outcomes, while non-indigenous students/learners and teachers often have greater awareness, respect, and appreciation for indigenous communities and peoples in consequence of the content that is shared during the course of educational pursuits

A prime example of how indigenous methods and content can be used to promote the above outcomes is demonstrated within higher education in Canada. Due to certain jurisdictions' focus on enhancing academic success for Aboriginal learners and promoting the values of multiculturalism in society, the inclusion of indigenous methods and content in education is often seen as an important obligation and duty of both governmental and educational authorities
Process
Curriculum
Main articles: Curriculum and List of academic disciplines

An academic discipline is a branch of knowledge which is formally taught, either at the university, or via some other such method. Each discipline usually has several sub-disciplines or branches, and distinguishing lines are often both arbitrary and ambiguous. Examples of broad areas of academic disciplines include the natural sciences, mathematics, computer science, social sciences, humanities and applied sciences.[6]

Learning modalities

There has been work on learning styles over the last two decades. Dunn and Dunn[7] focused on identifying relevant stimuli that may influence learning and manipulating the school environment, at about the same time as Joseph Renzulli[8] recommended varying teaching strategies. Howard Gardner[9] identified individual talents or aptitudes in his Multiple Intelligences theories. Based on the works of Jung, the Myers-Briggs Type Indicator and Keirsey Temperament Sorter[10] focused on understanding how people's personality affects the way they interact personally, and how this affects the way individuals respond to each other within the learning environment. The work of David Kolb and Anthony Gregorc's Type Delineator[11] follows a similar but more simplified approach.

It is currently fashionable to divide education into different learning "modes". The learning modalities[12] are probably the most common:[13]
Visual: learning based on observation and seeing what is being learned.
Auditory: learning based on listening to instructions/information.
Kinesthetic: learning based on hands-on work and engaging in activities.

It is claimed that, depending on their preferred learning modality, different teaching techniques have different levels of effectiveness.[14] A consequence of this theory is that effective teaching should present a variety of teaching methods which cover all three learning modalities so that different students have equal opportunities to learn in a way that is effective for them.[15] Guy Claxton has questioned the extent that learning styles such as VAK are helpful, particularly as they can have a tendency to label children and therefore restrict learning.[16]
Teaching

Teachers need to understand a subject enough to convey its essence to students. While traditionally this has involved lecturing on the part of the teacher, new instructional strategies such as team-based learning put the teacher more into the role of course designer, discussion facilitator, and coach and the student more into the role of active learner, discovering the subject of the course. In any case, the goal is to establish a sound knowledge base and skill set on which students will be able to build as they are exposed to different life experiences. Good teachers can translate information, good judgment, experience and wisdom into relevant knowledge that a student can understand, retain and pass to others. Studies from the US suggest that the quality of teachers is the single most important factor affecting student performance, and that countries which score highly on international tests have multiple policies in place to ensure that the teachers they employ are as effective as possible. [17]
Technology
Main article: Educational technology

Technology is an increasingly influential factor in education. Computers and mobile phones are used in developed countries both to complement established education practices and develop new ways of learning such as online education (a type of distance education). This gives students the opportunity to choose what they are interested in learning. The proliferation of computers also means the increase of programming and blogging. Technology offers powerful learning tools that demand new skills and understandings of students, including Multimedia, and provides new ways to engage students, such as Virtual learning environments. Technology is being used more not only in administrative duties in education but also in the instruction of students. The use of technologies such as PowerPoint and interactive whiteboard is capturing the attention of students in the classroom. Technology is also being used in the assessment of students. One example is the Audience Response System (ARS), which allows immediate feedback tests and classroom discussions.

Information and communication technologies (ICTs) are a “diverse set of tools and resources used to communicate, create, disseminate, store, and manage information.”[18] These technologies include computers, the Internet, broadcasting technologies (radio and television), and telephony. There is increasing interest in how computers and the Internet can improve education at all levels, in both formal and non-formal settings.[19] Older ICT technologies, such as radio and television, have for over forty years been used for open and distance learning, although print remains the cheapest, most accessible and therefore most dominant delivery mechanism in both developed and developing countries.[20]

The use of computers and the Internet is in its infancy in developing countries, if these are used at all, due to limited infrastructure and the attendant high costs of access. Usually, various technologies are used in combination rather than as the sole delivery mechanism. For example, the Kothmale Community Radio Internet uses both radio broadcasts and computer and Internet technologies to facilitate the sharing of information and provide educational opportunities in a rural community in Sri Lanka.[21] The Open University of the United Kingdom (UKOU), established in 1969 as the first educational institution in the world wholly dedicated to open and distance learning, still relies heavily on print-based materials supplemented by radio, television and, in recent years, online programming.[22] Similarly, the Indira Gandhi National Open University in India combines the use of print, recorded audio and video, broadcast radio and television, and audio conferencing technologies.[23]

The term "computer-assisted learning" (CAL) has been increasingly used to describe the use of technology in teaching.
Educational theory
Main article: Education theory

Education theory is the theory of the purpose, application and interpretation of education and learning. Its history begins with classical Greek educationalists and sophists and includes, since the 18th century, pedagogy and andragogy. In the 20th century, "theory" has become an umbrella term for a variety of scholarly approaches to teaching, assessment and education law, most of which are informed by various academic fields, which can be seen in the below sections.
Economics
Main article: Economics of education

It has been argued that high rates of education are essential for countries to be able to achieve high levels of economic growth.[24] Empirical analyses tend to support the theoretical prediction that poor countries should grow faster than rich countries because they can adopt cutting edge technologies already tried and tested by rich countries. However, technology transfer requires knowledgeable managers and engineers who are able to operate new machines or production practices borrowed from the leader in order to close the gap through imitation. Therefore, a country's ability to learn from the leader is a function of its stock of "human capital."[25] Recent study of the determinants of aggregate economic growth have stressed the importance of fundamental economic institutions[26] and the role of cognitive skills.[27]

At the individual level, there is a large literature, generally related back to the work of Jacob Mincer,[28] on how earnings are related to the schooling and other human capital of the individual. This work has motivated a large number of studies, but is also controversial. The chief controversies revolve around how to interpret the impact of schooling.[29]

Economists Samuel Bowles and Herbert Ginits famously argued in 1976 that there was a fundamental conflict in American schooling between the egalitarian goal of democratic participation and the inequalities implied by the continued profitability of capitalist production on the other.[30]

History
Main article: History of education

The history of education according to Dieter Lenzen, president of the Freie Universität Berlin 1994 "began either millions of years ago or at the end of 1770". Education as a science cannot be separated from the educational traditions that existed before. Adults trained the young of their society in the knowledge and skills they would need to master and eventually pass on. The evolution of culture, and human beings as a species depended on this practice of transmitting knowledge. In pre-literate societies this was achieved orally and through imitation. Story-telling continued from one generation to the next. Oral language developed into written symbols and letters. The depth and breadth of knowledge that could be preserved and passed soon increased exponentially. When cultures began to extend their knowledge beyond the basic skills of communicating, trading, gathering food, religious practices, etc, formal education, and schooling, eventually followed. Schooling in this sense was already in place in Egypt between 3000 and 500BC.

Nowadays some kind of education is compulsory to all people in most countries. Due to population growth and the proliferation of compulsory education, UNESCO has calculated that in the next 30 years more people will receive formal education than in all of human history thus far.[31]

Philosophy
Main article: Philosophy of education

Philosophy of education is the philosophical study of the purpose, process, nature and ideals of education. Philosophy of education can naturally be considered a branch of both philosophy and education. Philosophy of education is commonly housed in colleges and departments of education, yet it is applied philosophy, drawing from the traditional fields of philosophy (ontology, ethics, epistemology, etc.) and approaches (speculative, prescriptive, and/or analytic) to address questions regarding education policy, human development, education research methodology, and curriculum theory, to name a few.

Psychology
Main article: Educational psychology

Educational psychology is the study of how humans learn in educational settings, the effectiveness of educational interventions, the psychology of teaching, and the social psychology of schools as organizations. Although the terms "educational psychology" and "school psychology" are often used interchangeably, researchers and theorists are likely to be identified as educational psychologists, whereas practitioners in schools or school-related settings are identified as school psychologists. Educational psychology is concerned with the processes of educational attainment in the general population and in sub-populations such as gifted children and those with specific disabilities.

Educational psychology can in part be understood through its relationship with other disciplines. It is informed primarily by psychology, bearing a relationship to that discipline analogous to the relationship between medicine and biology. Educational psychology in turn informs a wide range of specialities within educational studies, including instructional design, educational technology, curriculum development, organizational learning, special education and classroom management. Educational psychology both draws from and contributes to cognitive science and the learning sciences. In universities, departments of educational psychology are usually housed within faculties of education, possibly accounting for the lack of representation of educational psychology content in introductory psychology textbooks (Lucas, Blazek, & Raley, 2006).

Sociology
Main article: Sociology of education

The sociology of education is the study of how social institutions and forces affect educational processes and outcomes, and vice versa. By many, education is understood to be a means of overcoming handicaps, achieving greater equality and acquiring wealth and status for all (Sargent 1994). Learners may be motivated by aspirations for progress and betterment. Education is perceived as a place where children can develop according to their unique needs and potentialities.[33] The purpose of education can be to develop every individual to their full potential. The understanding of the goals and means of educational socialization processes differs according to the sociological paradigm used.

Educational Development

In developing countries, the number and seriousness of the problems faced are naturally greater. People in more remote or agrarian areas are sometimes unaware of the importance of education. However, many countries have an active Ministry of Education, and in many subjects, such as foreign language learning, the degree of education is actually much higher than in industrialized countries; for example, it is not at all uncommon for students in many developing countries to be reasonably fluent in multiple foreign languages, whereas this is much more of a rarity in the supposedly "more educated" countries where much of the population is in fact monolingual.

There is also economic pressure from those parents who prefer their children making money in the short term over any long-term benefits of education. Recent studies on child labor and poverty have suggested that when poor families reach a certain economic threshold where families are able to provide for their basic needs, parents return their children to school. This has been found to be true, once the threshold has been breached, even if the potential economic value of the children's work has increased since their return to school.

A lack of good universities, and a low acceptance rate for good universities, is evident in countries with a high population density. In some countries, there are uniform, over structured, inflexible centralized programs from a central agency that regulates all aspects of education.
Due to globalization, increased pressure on students in curricular activities
Removal of a certain percentage of students for improvisation of academics (usually practised in schools, after 10th grade)

India is now developing technologies that will skip land based phone and internet lines. Instead, India launched EDUSAT, an education satellite that can reach more of the country at a greatly reduced cost. There is also an initiative started by the OLPC foundation, a group out of MIT Media Lab and supported by several major corporations to develop a $100 laptop to deliver educational software. The laptops are widely available as of 2009. The laptops are sold at cost or given away based on donations. These will enable developing countries to give their children a digital education, and help close the digital divide across the world.

In Africa, NEPAD has launched an "e-school programme" to provide all 600,000 primary and high schools with computer equipment, learning materials and internet access within 10 years. Private groups, like The Church of Jesus Christ of Latter-day Saints, are working to give more individuals opportunities to receive education in developing countries through such programs as the Perpetual Education Fund. An International Development Agency project called nabuur.com, started with the support of American President Bill Clinton, uses the Internet to allow co-operation by individuals on issues of social development.

Internationalisation

Education is becoming increasingly international. Not only are the materials becoming more influenced by the rich international environment, but exchanges among students at all levels are also playing an increasingly important role. In Europe, for example, the Socrates-Erasmus Programme stimulates exchanges across European universities. Also, the Soros Foundation provides many opportunities for students from central Asia and eastern Europe. Some scholars argue that, regardless of whether one system is considered better or worse than another, experiencing a different way of education can often be considered to be the most important, enriching element of an international learning experience.[34]

Education In Indonesia

CATEGORY: | Selasa, 23 Februari 2010
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Education in Indonesia is the responsibility of the Ministry of National Education of Indonesia (Departemen Pendidikan Nasional Republik Indonesia/Depdiknas), formerly the Ministry of Education and Culture of Indonesia (Departemen Pendidikan dan Kebudayaan Republik Indonesia/Depdikbud). In Indonesia, all citizens must undertake nine years of compulsory education, six years at elementary level and three in middle school

Based on the constitution , education is defined as a planned effort to establish a study environment and education process so that the student may actively develop his/her own potential to gain the religious and spiritual level, consciousness, personality, intelligence, behaviour and creativity to him/herself, other citizens and for the nation. The constitution also noted that education in Indonesia is divided into two major parts, formal and non-formal. A formal education is divided again into three levels, primary, secondary and tertiary education.


Primary Education

Early Childhood

From birth until the age of 3, Indonesian children do not generally have access to formal education. From the age of 3 to 4 or 5, they attend kindergarten (Taman Kanak-kanak). This education is not compulsory for Indonesian citizens, as the aim of this is to prepare them for primary school. The majority of kindergartens are private schools, with more than forty-nine thousand kindergartens, 99.35% of the total kindergartens in Indonesia, privately operated[1]. The kindergarten years are usually divided into "Class A" and "Class B" students spending a year in each class.

Elementary School

Children ages 6–11 attend Sekolah Dasar (SD) (literally Elementary School). This level of education is compulsory for all Indonesian citizens, based on the national constitution. In contrast to the majority of privately run kindergartens, most elementary schools are government operated public schools, accounting for 93% of all elementary schools in Indonesia[2]. Similar to education systems in the U.S. and Australia, students must study for six years to complete this level. Some schools offer an accelerated learning program, where students who perform well can finish elementary school in five years.


Secondary Education

Middle School

Middle School, generally known by the abbreviation "SMP" (Sekolah Menengah Pertama) is part of primary education in Indonesia. After graduating from elementary school, students attend Middle School for three years from the age of 12-14. After three years of schooling and graduation, students may move on to High School or College, or cease formal education. There are around 22,000 schools in Indonesia with a balanced ownership between public and private sector.

High School

In Indonesia, generally known as by the abbreviation "SMA" (Sekolah Menengah Atas) and SMK (Sekolah Menengah Kejuruan) . SMA/SMU differ than SMK in their studies. The students at SMU are prepared to advance to tertiary education while students of SMK are prepared to be ready to work after finishing their school without going to university/college. Based on the national constitution, Indonesian citizens do not have to attend high school as the citizens only require nine years of education. This is also reflected by the number of high schools in Indonesia, with just slightly below 9,000 schools.

Tertiary School

After graduation from High school or college, students may attend a university (higher education). The higher education institution is categorized in two types: public and private which supervised by Departement of National Education. There are 3 types of higher education institution: Universities, Institutes and Academy or college.