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

Science - Essay ExampleThis burning of the wick and gaseous turn out is an example of a chemical substance change.Thus, a chemical change (or chemical chemical response) is a change in which one kind of matter is changed into a different type of matter. Some other examples of chemical changes hold the rusting of your car, setting your shoe on fire or digesting food. All of these materials combine chemically with some other material , and can non be separated by any somatogenic means.A physical change is a change in the form of matter but not in its identity. The dissolving of one issue into another thing is an illustrative. For instance, dissolving sugar into body of 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 atomic number 18 both H20. The identity of the matter is not changed, just the state that it is in. come back a physical change is when no new chemical su bstance is formed.As it has already been mentioned, a chemical reception occurs when two or more chemical substances are mixed together and change into new substances. For this to happen, the bonds mingled with atoms and molecules mustiness 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 p ry 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(p) 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 formed on paper by chemical compares. For example, total heat 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 re action, 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 dimmed material we call tarnish 2