This website uses cookies to ensure you have the best experience. Learn more

Physical Change Essay

497 words - 2 pages

PHYSICAL CHANGE
Physical changes are changes affecting the form of a chemical substance, but not its chemical composition. Physical changes are used to separate mixtures into their component compounds, but cannot usually be used to separate compounds into chemical elements or simpler compounds.[1]
Physical changes occur when objects or substances undergo a change that does not change their chemical composition. This contrasts with the concept of chemical change in which the composition of a substance changes or one or more substances combine or break up to form new substances. In general a physical change is reversible using physical means. For example salt dissolved in water can be recovered by allowing the water to evaporate.
A physical change involves a change in physical ...view middle of the document...

Some substances such as iodine and carbon dioxide go directly from solid to gas in a process called sublimation.
Magnetism
Ferro-magnetic materials can become magnetic. The process is reversible and does not affect the chemical composition.
Crystallisation
Many elements and compounds form crystals. Some such as carbon can form several different forms including diamond, graphite, graphene and fullerenes includingbuckminsterfullerene.
Crystals in metals have a major effect of the physical properties of the metal including strength and ductility. Crystal type, shape and size can be altered by physical hammering, rolling and by heat
Mixtures
Mixtures of substances that are not soluble are usually readily separated by physical sieving or settlement. However mixtures can have different properties from the individual components. One familiar example is the mixture of fine sand with water used to make sandcastles. Neither the sand on its own nor the water on its own will make a sand-castle but by using physical properties of surface tension, the mixture behaves in a different way.
Solutions
Most solutions of salts and some compounds such as sugars can be separated by evaporation. Others such as mixtures or volatile liquids such as low molecular weight alcohols can be separated by fractional distillation.
Alloys
The mixing of different metal elements is known as alloying. Brass is an alloy of copper and zinc. Separating individual metals from an alloy can be difficult and may require chemical processing – making an alloy is an example of a physical change that cannot readily be undone by physical means. Alloys where mercury is one of the metals can be separated physically by melting the alloy and boiling the mercury off as a vapour.

Other assignments on Physical Change

Hello Essay

289 words - 2 pages Opinionnaire In my opinion, the phrase “sticks and stones may break my bones but words will never hurt me” is untrue. Sometimes words are what hurt us the most, whether it’s about our race, sexual orientation, or physical appearance. Firstly people make jokes all the time about different races. If you’re Indian or Mexican people will make fun of your heritage, the way you talk and the way you dress. This can be really offensive to people. Just

Change Essay

1331 words - 6 pages anytime. …Talk about your own experience….job change sometime are very good….Not only that GOD wants us to be LENDERS and NOT Borrowers. How many of us can pay a brother or sisters rent for 90 days without an issue…not many if any……Deuteronomy 8:18..Power to Get Wealth….Expound Physically, we want to present the Temple first HOLY and Acceptable then in top Physical shape so that you are fit to do the work of the kingdom and your body does not

Climate Change

570 words - 3 pages most vulnerable to natural disasters, while second among the Asian countries. Most of the climate change impacts in Bangladesh are likely to come from the south —that is, the Bay of Bengal and the adjoining North Indian Ocean. These waters are the sources of tropical cyclones and storm surges, coastal erosion, monsoon wind, evaporation for monsoon rainfall, floods, and droughts. Considering these, the present paper concentrates on the following topics: tropical cyclones, storm surges, coastal erosion, back water effect on floods, increasing heat waves-drought, Salinity Intrusion and mental and physical health effects by Climate Change in Bangladesh.

Ssss

370 words - 2 pages conscious decision to retain the risk, b. an unconscious decision to retain the risk, c. can be motivated financially, d. all of the above. 4. An example of risk distribution is: a. a partnership, b. an insurance, c. a smoke detector, d. all of the above. 5. The pure risk is a situation which may result in: a. gain, loss or no change, b. loss or no change, c. gain or loss, d. gain or no change. 6. Mark the main types of a hazard: a. physical hazard, b

Anxiety

952 words - 4 pages Anxiety Disorder Dawn Murray Bryant & Stratton College PSYC101 Ms. Sara Bevilacqua 10/1/2014 Abstract Anxiety is a state of intense worrying. This disorder affects 6.8 million people in the United States each year. People who suffer from this disorder may face psychological and physical symptoms. Fortunately, there are many different treatment options available. Anxiety can happen for a specific reason or for no reason at all

Tbh I'M Just Doing This So I Can Join

587 words - 3 pages will never accept until we see it for ourselves. The cave represents the physical world in which we live. This “cave” that we live in makes us somewhat ignorant to change, and until we become more accepting of the world of forms, we are not fully able to reason. The shadows represent objects in the physical world we live in. These objects are a mere illusion of reality, because they are ever-changing, unlike the constant world of forms. Society

Motivational By Managers Of A Health Care Organization

662 words - 3 pages necessarily a physical alteration of your business, a wholesale change in the way your company brings in money, or a shift in how your business manufactures products. Organizational change can apply to culture, business strategies, and human resources management. These no corporeal changes occur both in the minds of your workers and within the philosophies of how you, as the owner, choose to do business. According to Management Help's website

Community Services

531 words - 3 pages some change. Protecting our environment, community, history, and our legacy. If we develop an alternative model to what is not working, a sigh of progress will be made. The idea of personal change is challenging, but we need to change our behaviors to avoid more concerns, frustrations, and ethics. In the Guerilla Nudge Project, we discussed the issue of cleaning dishes with a dirty dishwasher and identified a solution of an indicator that identifies the contents of the dishwashers. It is by thinking small in big ways that contribute to the enhancement of our physical infrastructure.

Chapter 20 Flash Cards

2250 words - 9 pages services, such as land, labor, capital, and entrepreneurship. | 20-4. Marginal physical product (MPP) is the change in total output that results from employing one more unit of input. As long as MPP is positive, a firm can add to its total output by employing the worker. | 20-3. The marginal physical product (MPP) is the change in total output associated with one additional unit of input. | 20-6. The problems of crowded facilities

Hbo- Chapter 2

846 words - 4 pages diversity refers to the important similarities and differences among the employees of organizations. Technology refers to the methods used to create products, including both physical goods and intangible services. Technological change has become a major driver for other forms of organization change. Ethics are a person’s beliefs regarding what is right or wrong in a given situation. Corporate governance refers to the oversight of a public

Jdnifdfnk`

970 words - 4 pages of wonders by both mathematical and physical hypotheses. His interest in astronomy was motivated by the difference between physical and mechanistic model of the holy scopes and the mathematical model. On the Structure of the World, of which only the Latin translation has been published, describes world of four elements and the holy scopes in all their difficulty (his only change is to accept the theory that the solar apogee is fixed with respect

Similar Documents

How Can The Government Encourage Participation In Sports And Physical Education Among The Elderly And Handicapped?

514 words - 3 pages competitive sport and a physical education curriculum must be planned for and incorporated into all structures, strategies and programmes. These include community facilities, leisure and sporting venues for these persons to go to daily or weekly to learn a sport or just to do some exercises just like the non-disabled persons. However, this will greatly raise their self-esteem and make society change their views about them not being able to do sports like

Security Policies Overcoming Business Challenges Essay

470 words - 2 pages Unit 1 Assignment 1: Security Policies Overcoming Business Challenges There are a number of Information Technology security controls. The three most common are: physical, technical, and administrative controls; however, many organizations break down administrative controls into two separate categories: procedural and legal controls. "Security controls are the means of enforcing security policies that reflect the organization's business

Ob Tilton Leadership Traits Essay

2118 words - 9 pages OB Seminar 12: Managing Change & Stress • • • • Team Discussion on Case Study Team Presentation Reflection & Experiential Exercise Lesson 12 (Chapter 18) 1 Case study on Lynn Tilton’s leadership (p. 389) 1. Use Table 16-2 to evaluate the extent to which Lynn Tilton displayed the characteristics associated with being a good leader and good manager. 2 Case study on Lynn Tilton’s leadership (p. 389) 2. Which different positive

The Four Social Revolutions Essay

447 words - 2 pages cause of social change. In particular, he identified three processes by which technology drove social change: Invention, discovery, and diffusion. While invention can refer the combination and transformation of existing materials into new items, it can also refer to social invention and the propagation of new ideas. The aforementioned invention of the plow is one example of a physical invention, but the invention of economic and political