Science Essay Example | Topics and Well Written Essays - 1000 words

Science - Essay Example 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). Remember: when a new chemical substance is produced, the change is known as a chemical change. This does not mean that new elements have been made. In order to make new elements, the nuclear contents must change, but there are magnitudes of difference in the amounts of energy in ordinary chemical reactions compared to nuclear reactions. The alchemists, in their efforts to change less expensive metals to gold, did not have the fundamental understanding of what they were attempting to do to appreciate the difference. What happens to matter when it undergoes chemical changes According to the law of conservation of mass, atoms are neither created, nor destroyed, during any chemical reaction. Thus, the same collection of atoms is present after a reaction as before the reaction. The changes that occur during a reaction just involve the rearrangement of atoms (Chemtutor, 2003; Gallagher, 2001). Chemical reactions are represented on paper by chemical equations. For example, hydrogen gas (H2) can react (burn) with oxygen gas (O2) to form water (H20). The chemical equation for this reaction is written as: The '+' is read as 'reacts with' and the arrow means 'produces'. The chemical formulas on the left represent the starting substances, called reactants. The substances produced by the reaction are shown on the right, and are called products. The numbers in front of the formulas are called coefficients (the number '1' is usually omitted). Because atoms are neither created nor destroyed in a reaction, a chemical equation must have an equal number of atoms of each element on each side of the arrow (i.e. the equation is said to be 'balanced'). Here are some more examples of chemical reactions with the corresponding chemical equations: a silver spoon tarnishes. The silver reacts with sulfur in the air to make silver sulfide, the black material we call tarnish: 2

Partition as a Solution to Ethnic Civil Wars Term Paper

Partition as a Solution to Ethnic Civil Wars - Term Paper Example Such feelings are never in favor of a country because they start destroying the foundations of the country slowly and gradually. When a group of people starts feeling unprivileged as compared to other people, they raise their voice against the government officials and the government’s discriminating policies, which results in starting a civil war. Kirschner, in an article states, â€Å"Individuals are more likely to continue fighting once a war begins, foreseeing severely restricted opportunities, if not annihilation, under the current state†. The best way to deal with such kinds of problems is to negotiate with the ethnic groups in order to know their concerns. If a government becomes unable to satisfy the people properly, chances of conflicts start increasing in the country, which leads the country towards many problems, such as, demand for separation or partition within the state. Chapman and Roeder state, â€Å"Partition is more likely than alternative institutiona l arrangements—specifically, unitarism, de facto separation, and autonomy arrangements—to preserve the peace and facilitate democratization† (677-691). ... Partition is one of the strategies to terminate all sorts of ethnic wars in a country. When government do not find any other way to the solution of the problems, it starts thinking of partition within the state in order to let the ethnic groups live their life on their own. However, it is never an easy decision for any government because partition destroys the autonomy and power of the government of the country. Partitions not only affect the political structure and but also affect the control of central government. Apart from these disadvantages of partition, there are several advantages of partition for the ethnic groups. Let us discuss some of the most considerable benefits in some detail in order to get a better understanding of how partitions terminate the possibility of ethnic civil wars in a country. Solution to Ethnic Wars Partitions are a good solution to the end of ethnic wars. Ethnic conflicts give rise to many problems for a country. They not only destabilize the economy of a country but also disturb the peaceful atmosphere of the whole nation. Ethnic conflicts arise when a group of people belonging to some specific culture or society start feeling unprivileged and ignored by the government. Such groups raise their voice to stop discrimination and unfairness against minorities and to give full protection to their rights. When a government fails to fulfill the demands of the ethnic groups, they start movements and strikes against the government. It acts as the starting point towards partition. Such groups start demanding a separate nation or a separate place where they can live their lives independently and in accordance with their cultures. In history, there are many examples in which different movements against the governments