project report on physical and chemical changes effect on our environment
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Answer:
The surroundings are the critical physical and chemical surroundings for life. Changes, anthropogenic or otherwise, to the physical and chemical residences of the environment have the capability of affecting without delay the excellent of lifestyles and even the very lifestyles of a few sorts of existence. Human-brought on weather alternate, especially, in addition to other international environmental problems including land degradation, lack of biological range and stratospheric ozone depletion, threatens our potential to satisfy very basic human wishes, inclusive of adequate food, water and power, safe shelter and a wholesome environment. A notable majority of the scientific network, while spotting that medical uncertainties exist, trust that human-induced weather alternate is inevitable. Further proof of the fact of climate alternate was made to be had through the work of the IPCC, hooked up via WMO and UNEP in 1988. The lately released IPCC's Third Assessment Report paperwork the maximum complete photograph of the country of the weather and the global environment but published, confirming that earlier decisions and projections of world mean temperature will increase had been underestimated. The IPCC additionally concludes that human activity is having a discernible impact on the surroundings, and that worldwide temperatures are projected to growth at a fee extraordinary inside the final thousand years. A majority of specialists accept as true with that crucial reductions in internet greenhouse gas emissions are technically possible because of a huge range of technologies and policy measures within the electricity supply, electricity demand and agricultural and forestry sectors. Besides, the expected destructive effects of climate trade on socio-financial and ecological structures can, to some diploma, be reduced thru proactive edition measures. Consequently discussions are taking vicinity beneath the UNFCCC and the Kyoto Protocol seeking how to nice cope with this trouble, in particular in developing mitigation and version strategies to save you future generations from excessively terrible impacts and to lessen the world vulnerability to these adjustments. The meteorological network and, particularly, the Weather Services are now being increasingly solicited through the media, most people and country wide and private establishments for records and steerage on climate troubles. It is then important that the technical and expert body of workers of climate offerings have the vital historical past and know-how of fundamental concepts and procedures of the difficulty of weather trade so that it will offer authoritative responses.
Explanation:
Answer: CHEMICAL AND PHYSICAL CHANGES AND THEIR EFFECT
ON OUR ENVIRONMENT
Shenelle Pearl Ghulam1 & Nina Nyberg1
1Chemistry Teacher Education Unit, University of Helsinki
Abstract Chemical and physical changes are essential to man and the environment. Understanding how
to differentiate between chemical and physical changes is an essential skill that secondary school
students must acquire. Additionally, it is important for students to understand how the interference of
man has caused some chemical and physical changes to become harmful for the environment, society
and the economy. This article presents a lesson plan that aims to enhance student understanding of
chemical and physical changes, and to encourage students to analyze how chemical and physical
changes can have a harmful effect on the environment. The article also presents an explanation of
inquiry-based learning and context-based learning, which were the main teaching techniques used
throughout the lesson. The lesson plan includes instructions to carry out four experiments at varying
levels of inquiry. The students are required to analyze the result of their experiments in relation to the
environmental problems we face today. Assessment methods that incorporate the use technology are
presented as well.
1 Introduction
Chemical and physical changes are an essential part of life. Unfortunately, some of the physical
and chemical changes that occur daily, due to the intervention of man, are harmful for the
environment.
After much research and planning, a lesson plan on chemical and physical changes and
their effect on our environment was designed. The aim of the lesson was to promote students
understanding of chemical and physical changes, and to enhance their ability to differentiate
between chemical and physical changes. The lesson also aimed to educate students on current
environmental issues, by additionally enhancing student’s ability to make connections between
laboratory experiments and real life issues (context-based learning). These objectives were
achieved by carrying out four inquiry-based experiments, the experiments conducted were
mainly varying levels of guided inquiry.
The lesson plan takes into consideration the Finnish National Curriculum. The
curriculum specifies that students must “learn to know about the physical and chemical
concepts that describe the properties of substances and learn to apply those concepts” (Finnish
National Board of Education, 2004). Additionally, the curriculum states that students must
learn to carry out scientific investigations and to interpret their results. Further, the curriculum
also indicates the importance of introducing aspects related to environmental issues to the
students. (Finnish National Board of Education, 2004)
2 Theory
2.1 Chemical and Physical Changes
Chemical changes result in the production of new chemical substances. At a molecular level,
chemical changes involve making or breaking bonds to create the new chemical substance.
Examples of chemical reactions include: rusting where iron oxide is produced, or burning
gasoline where water vapor and carbon dioxide are produced. (Tro, 2011)
A physical change does not involve changing a substances chemical identity. Physical
changes do not produce new substance, even though the starting and ending substances may
look different from each other. Examples include: phase changes, such as the melting of snow
or creating mixtures, for example, mixing water and sugar. (Tro, 2011)
It is possible to tell chemical and physical changes apart by a couple of clues. There are
a few signs that indicate that a chemical reaction took place, such as, color change, formation
of precipitate, formation of a gas, odor change, temperature change, sound, and light. Generally
chemical reactions/changes are irreversible and physical changes are reversible. Yet some
chemical reactions are reversible. For example, heating ammonium chloride forms ammonia
and hydrogen chloride gas. However, when the gases are trapped and cooled, a white solid of
ammonium chloride is reformed. Likewise, some physical changes are irreversible. For
example, breaking or damaging some materials is irreversible, such as cutting down a tree.
(Tro, 2011; Baxter & Dilley, 2014)
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