Cold packs are designed to become very cold when activated. when the pack is activated, a chemical reaction occurs to make the temperature of the cold pack decrease. what must be true of this chemical reaction? (2 points) a. the reaction releases energy to its surroundings. b. the products and reactants have the same amount of energy. c. the products have less energy than the reactants. d. the reaction absorbs energy from its surroundings.

D. The reaction absorbs energy from its surroundings.

Explanation:

Cold packs have an endothermic chemical reaction. In an endothermic reaction energy is absorbed by the system from the surrounding. Exothermic reaction releases energy from the system into the surrounding.  If a pack had a chemical reaction such that the reaction released energy into surrounding then it would be a hot pack.

the correct name for the n3 ion is azide. azide is a polyatomic anion with a -1 charge and is written as n3 -1. it consists of three nitrogen atoms bonded together. hope i . let me know if you need anything else.

each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.