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Home Concept Builders Chemical Bonding and Molecular Shape Lewis Structures Directions

Lewis Structures - Directions

Using the Lewis Structures Concept Builder is quite simple. There are three activities in all. In the first activity, you have to determine the number of valence electrons in a compound when given the compound formula. You can enter the number directly into the answer field. Or tap on the icon for our built-in Number Pad and punch in the number from there. Once you are satisfied with your answer, tap on the Check Answer button. You will receive immediate feedback and your Progress Report will be updated.

In the second and third activities, you are presented with the formulas for three compounds (or ions) and a corresponding Lewis Structure. You will have to determine if the Lewis Structure is correct. Give attention to the number of valence electrons in the formula and the number shown in the Lewis Structure. Also give attention to the duet rule (for Hydrogen) and the octet rule. Tap on all the incorrect Lewis Structures to select them as part of your answer. Select all that are incorrect. If you change your mind, you can tap a second tmie to deselect the Lewis Structure. Whenever one or more Lewis Strucutres are selected, a Check Answer button will appear. If you are satisfied with your answer, then tap on the Check Answer button. Your answer will be evaluated and your Progress Report will be updated. If you are not certain of your choice, then you can continue tapping until you are.

Your goal is to earn "Stars" and to complete one or more difficulty levels. Stars are earned when you show success on a particular question. Once you show success on all the questions for a particular difficulty level, you will earn the trophy for that level.

Concept Builder Teacher Notes