ACTIVITY 14

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1. Combustion implies the chemical reaction of a __________ with an ______________, where light or heat energy is obtained as a ________. Whenever something is “burned”, ____________ is taking place. The word equation for combustion of a hydrocarbon is: 2. This reaction must always be _______________(atoms in the reactants = atoms in the products). 3. Combustion is a reaction in which... 4. The net result of this chemical change is the liberation of _____________. When a chemical reaction liberates heat, it is known as an _______________ reaction. 5. If a gram of carbon is burned with pure _____________, it will form ________________ as its only product. 6. The first step is breaking the ___________ between the _______________ and the oxygen atoms. For this to happen, you need to add _____________ to the carbon/oxygen mixture. This is done for example with a _________. 7. When the ________________ bonds and the _______________ bonds have broken, they form new ___________. The ____________ atoms combine with _____________ atoms to form __________________. The amount of energy liberated when 1 mole of carbon is burned with oxygen is _______kilocalories. 8. Three things are necessary for combustion to take place, write them... 9. ____________ agent. The oxygen (O2) in air is the most common __________ agent used in ____________. 10. What happens during combustion? (explain it with your own words) 11. Upon breaking the bonds in the hydrocarbon, all the different compounds combine with oxygen. Whenever a hydrocarbon is burned, it produces __________. 12. If the hydrocarbon has hydrogen, this combines with the oxygen to form _______. 13. ____________ is produced in the form of light or heat. 14. Combustion has allowed humanity to survive since it provides ________ to fight off cold and to ___________ food. 15. Early scientists believed that combustion liberated a “________________” upon burning the material. This assertion explains how the ________ of substance such as wood could not ________. This idea lasted for at least _____ centuries. One thing this theory could not explain was the fact that some substances ___________ after they are burned. 16. Since the discovery of oxygen, French scientist ___________________ formulated a theory affirming that combustion is the process in which _____________ combine with ____________. After experiments with more exact measurements, he was able to prove his theory correct. 17. Lavoisier also studied the heat generated by ___________. In his experiments, he was able to demonstrate that the amount of _______ applied to separate a ________________is the same as the heat liberated when the same ____________ is formed. With this discovery, ___________________ was born. 18. With the _______________________, it was possible to use the combustion in ___________ machines to generate work from them. With the combustion of ___________, water was heated until it ___________, and by evaporating it was able to move ______________ and ___________ machines. This same process is used in plants that generate _______________. 19. Until new __________ were discovered, like __________ and others derived from ______________, internal combustion ____________ were created and the methods of ________________ were made accessible to greater population. 20. Today, the majority of transportation depends on the combustion of a hydrocarbon fuel such as ____________, ______________, or _____________ fuel to move vehicles. 21. Global warming. The global temperature of the ________ has ____________ in the last 20 years. This is causing a series of ___________ changes that can be violent and cause deaths (___________, ___________,_________). Scientists believe that an increase in _________ produced by the burning of hydrocarbons such as ______________ is causing the _____________ effect, which is responsible for global ___________. 22. Explain with your own words the Greenhouse effect 23. How the acid rain is produced? Explain it with your own words.