Coal contains carbon and other elements. Carbon dioxide forms when coal burns in the presence of oxygen. Which of these is the best evidence that a chemical reaction occurs when coal burns? O the shape of the coal changes O a new substance is produced O oxygen is present O coal is made up of more than one element 11 12 13 14 15 16 17 18 19 20

Coal contains carbon and other elements. Carbon dioxide forms when coal burns in the presence of oxygen. Which of these is the best evidence that a chemical reaction occurs when coal burns? O the shape of the coal changes O a new substance is produced O oxygen is present O coal is made up of more than one element 11 12 13 14 15 16 17 18 19 20

Chemistry In Focus

7th Edition

ISBN:9781337399692

Author:Tro, Nivaldo J.

Publisher:Tro, Nivaldo J.

Chapter4: Molecules, Compounds, And Chemical Reactions

Section: Chapter Questions

Problem 6E

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AI anges saved 19. Determining whether the formation of an ionic compound is endothermic or exothermic reaction requires analyzing the individual steps that must occur for the reaction to take place. Which of the following steps is not necessary to combine barium and chlorine into the compound barium chloride? Ba(a) + Cl2 (e) → BaCl2 Ions combine to form compound. Barlum must be lonized. O The compound must be separated Into lons. O Chlorine must be ionized. PREVIOUS 19 of 25 NEXT SAVE& US Lit hp
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