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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3. Remember that the nitric acid in water is H*lao) and NO3aol. The brown gas evolved is an oxide of nitrogen, which can be identified by the description of the nitrogen oxides in the CRC Handbook, in the "Table of Physical Constants of Inorganic Compounds." No atmospheric Oz is involved in this experiment. List at least four different oxides of nitrogen and circle the one you observed during your reaction.