Science Essay

College
Essay
Science
Pages 4 (1004 words)
Download 0
Physical and chemical changes are everywhere, but these processes sometimes are so simple and common, that we may not even notice them. For example, if we cut an apple into two sections and ten minutes later observe what happens to the inside color, we will notice that it has become darker…

Introduction

This burning of the wick and gaseous wax is an example of a chemical change.
Thus, a chemical change (or chemical reaction) is a change in which one kind of matter is changed into a different type of matter. Some other examples of chemical changes include the rusting of your car, setting your shoe on fire or digesting food. All of these materials combine chemically with another material , and cannot be separated by any physical means.
A physical change is a change in the form of matter but not in its identity. The dissolving of one thing into another thing is an illustrative. For instance, dissolving sugar into water. The water and the sugar retain their chemical identities and can be separated by physical means. One more example - ice melting to water. Ice and water are both H20. The identity of the matter is not changed, just the state that it is in. Remember: a physical change is when no new chemical substance is formed.
As it has already been mentioned, a chemical reaction occurs when two or more chemical substances are mixed together and change into new substances. For this to happen, the bonds between atoms and molecules must break up and then re-form in different ways. Because the bonds can be strong, energy (usually in the form of heat), is often needed to start a reaction.
The new substances (products) have different properties from those of the original substances (reactants). ...
Download paper
Not exactly what you need?

Related papers

Crime Science
Three features distinguish crime science from criminology: it embraces the physical, computer and engineering sciences as well as the social; it focuses on crime rather than criminals, and it is single-minded about cutting crime, rather than studying it for its own sake. Crime science was conceived by the British broadcaster Nick Ross in the late 1990s in order to recruit scientific methods to…
Science ommunication
Science communication programmes and activities have a very important role to play for developing a scientifically informed and attitudinally rational society. Sustained science communication efforts play a key role in enhancing level of public understanding of science and thus empowering them with useful knowledge. This can be done by way of interpretation of scientific knowledge and scientific…
Science
Inrecentyears,acompletely new field of technology has developed from advances in the life sciences. Known as biotechnology, it involves such varied activities as genetic engineering, the manipulation of genetic material of cells or organisms, and cloning, the formation of genetically uniform cells, plants, or animals. Although still in its infancy, many scientists believe that biotechnology will…
Evaluation of Science and Technology Policies
A number of measures, called performance indicators are usually invented in order to simplify the evaluation process and make it more easily readable by non-expert groups (e.g. investors). "Simply put, performance indicators are measures that describe how well a programme is achieving its objectives Indicators are usually quantitative measures but may also be qualitative observations. They define…
Science Essay
This burning of the wick and gaseous wax is an example of a chemical change.…
Enviornmental Science
While the concept of environmental science has existed for centuries, it came alive as a substantive, active field of scientific investigation in the 1960s and 1970s driven by: (Wikipedia)…
Environmental Science Bachelor Essay
This essay takes the view that it is already too late to address the current colossal effects of pollution on environment and the only way to redeem ourselves is to adopt technology as an aide to developing cleaner solutions. Scientists, policymakers, and laypeople are beginning to evaluate and understand the gravity of the situation and interpret data about environmental change in a new light:…