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evidence of chemical reaction

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From Wikipedia

Chemical reaction

A chemical reaction is a process that leads to the transformation of one set of chemical substance s to another. Chemical reactions can be either spontaneous, requiring no input of energy, or non-spontaneous, often coming about only after the input of some type of energy, viz. heat, light

Chemical property

A chemical property is any of a material's properties that becomes evident during a chemical reaction; that is, any quality that can be established only by changing a substance's chemical identity. Simply speaking, chemical properties cannot be determined just by viewing or touching the substance; the substance's internal structure must be affected for its chemical properties to be investigated.

Chemical properties can be contrasted with physical properties, which can be discerned without changing the substance's structure. However, for many properties within the scope of physical chemistry, and other disciplines at the border of chemistry and physics, the distinction may be a matter of researcher's perspective. Material properties, both physical and chemical, can be viewed as supervenient; i.e., secondary to the underlying reality. Several layers of superveniency are possible.

Chemical properties can be used for building chemical classifications.

Examples of chemical properties

For example hydrogen has the potential to ignite and explode given the right conditions. This is a chemical property.

Metals in general do they have chemical properties of reaction with an acid. Zinc reacts with hydrochloric acid to produce hydrogen gas. This is a chemical property.



From Yahoo Answers

Question:Hi , I'm an 8th grader and in charge of doing a project about chemical reactions Here is my question: What are four types of evidence of a chemical reaction? Thanks Can you explain them?

Answers:Usually a particular type of reaction will produce several evidences to show its complete reaction. 1. Temperature changes 2. If possible a precipitate is observe, this will only happen if the product is insoluble in the solvent 3. Effervescence can be observed in a form of bubbles or gas. 4. Colour of the reaction mixture may change

Question:I'm not looking for evidence in the equation, Im looking for evidence by just looking at the two reacting. (ex. forms bubbles, changes color, etc.) Thanks!

Answers:It will fizz and form bubbles

Question:why not before? i know that based on the chemical equation, when water is added water and carbon dioxide is created; but when water is not added they are just two solids mixed in together.

Answers:In order for most chemical reactions to occur the IONS need to react, until the water is added the substances are just compounds, after the water is added, the compounds split into their ions and readily react.

Question:this is about unsaturated hydrocarbons

Answers:lol...i just had this experiment...anyways...KMnO4 is purple right, so when added to alkene it should change to a brownish color. That brown color is a precipate formed.

From Youtube

Evidence of a Chemical Reaction Part 1 :This is part one "Evidence of a Chemical Reaction." I conducted 4 demonstrations showing one or more of the following characteristics: a color change, precipitate formation, gas production, and a temperature change (either exothermic or endothermic). Part 2 of this video completes the aluminum foil and copper chloride demonstration and reviews the important concepts that were shared.

Experimental evidence for the space matter in an atom :In an isolated- non-radioactive atom, there are two types of forces acting on its electrons. They are attraction from the nucleus and repulsion between electrons (in hydrogen atom, attraction from the nucleus only). But, these forces cannot create constant motion in electrons and so the current theory of atom is simply wrong. Volume of atoms and elastic nature of atoms [for example, 1. gas atoms move randomly in high speed and bounce back when they collide with other atoms or its container, 2. the capacity of a material to store thermal energy (oscillation and collision between atoms)] indicate that the nucleus of an atom is surrounded by a form of elastic matter. I name this matter as space matter. An experiment for detecting space matter that released in a chemical reaction: When the combustion is taking place in the combustion container, the space matter that released in the reaction will be filled in the space matter collector and flows to the refraction box through the space matter channel. When a light beam is passed through this space matter flow, a shadow effect (shadowgraph) is obtained. Watch my other videos: Structure of the atom, structure of a charged particle, electric field and magnetic field, how is light emitted, light is oscillating magnetic line, nuclear energy, uncertainty principle is wrong, no standing waves and matter waves, etc. List of related videos: The space inside of atom is not empty, but filled with space matter. Experimental evidence for ...