Summary CHEMISTRY: THE MOLECULAR NATURE OF MATTER AND CHANGE 7TH EDITION

Chapter 1 keys to study of chemistry Step 1 1 of 3 In this task, we have to answer if A+B results in C, is it a physical or a chemical change? First, let`s look at the substances we have at the beginning. We have gas molecules (red molecules) and solid molecules (blue molecules). In this case, the result of their interaction is depicted as a compound consisting of both. Step 2 2 of 3 Chemical change by definition, is a change in which a substance or mixture of substances is converted into a new substance. We can conclude that this is a chemical change because the interaction formed a new molecule. We also have the formation of chemical bonds between red and blue substances. We know that the reaction is chemical because the formed substance is a compound formed from both substances we had at the beginning. Step 1 1 of 3 In this task, we have to answer if A+B results in D, is it a physical or a chemical change? Chemical change by definition, is a change in which a substance or mixture of substances is converted into a new substance. Step 2 2 of 3 First, let's look at the substances we have at the beginning. We have gas molecules (red molecules) and solid molecules (blue molecules). In this case, the result of their interaction is depicted as a compound that consists of both but is in a solid state. We can conclude that this is a chemical change because the interaction resulted in a new compound that is a mixture of both substances we had at the beginning. This time, the newly formed compound is in a solid state as opposed to the subtask a) where the new compound was in a gaseous state. Answer Chemical change Step 1 1 of 3 In t