What is a physical reaction in chemistry? What substance speeds up a chemical reaction? What are the key characteristics of a chemical reaction? Are chemical elements formed via chemical reactions? What type of chemical reaction is fire?
What type of chemical reaction is fire? What state of matter is carbon dioxide? What state of matter is evaporation? What is the formula for water? Which substances form a homogeneous mixture when mixed with water? What types of substances dissolve easily in water?
but not a chemical reaction. A reaction involves a rearrangement of molecules or ions into a different structure. Contrast this with aphysical change, where the appearance is altered, but the molecular structure is unchanged, or a nuclear reaction, in which the composition of the atomic nucleus ...
Fire is a chemical reaction. 火是一种化学反应。 A fire needs oxygen and some kind of fuel. 火是需要氧气和某种燃料共同作用的。 This fuel–whether it's candle wax, wood, or gasoline– 这些燃料不管是石碏、木头还是天然气 usually contains big molecules that have carbon atoms inside them. ...
29.What is/are the factors that affect of chemicalreaction? a)Concentration b)Surface area c)Temperature d)Catalysts 30.What of an acid id the amount of pure acid that is dissolved per liter of water a)some b)much c)concentration d)percent B.Answer the followingquest ionwith a short par...
Shortwritingsmissedasaresultofanexcused absencewillbeaccepted. 1.Whereisthistextprobablytakenfrom? A.Atextbook. B.Anexampaper C.Acourseplan. D.Anacademicarticle. 2.How manypartsisastudent?sfinalgrademade upof? A.Two. B.Three. C.Four. D.Five. 3.Whatwillhappenifyousubmitanessayone weekafterth...
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the case of a wood-burning fire, this is a chemical reaction where the wood is rapidly oxidized, producing gases such as oxygen, carbon dioxide and steam. In the process of chemically breaking down the wood in the fire, energy is released into the environment in the form of heat and ...
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firedamage Regular Member Posts: 67 Mole Snacks: +0/-7 What evidence of a chemical reaction might you see in the following cases? « on: February 07, 2009, 07:31:46 PM » 1)Bleaching a stain2)Burning of a match3)Rusting of an iron nailis it the answer should be 1)single di...