An atom of calcium loses two electrons. what is the charge on an ion of calcium? question 6 options: a.0 b.–2 c.+2 d.+3

Rays from the sun are not considered matter true or false

Need asap question 1 minerals are organic compounds. true false question 2 what vitamin can be found in foods like oranges, grapefruits, and broccoli? a. vitamin a b. vitamin k c.vitamin c d. vitamin d question 3 what are minerals? a. chemical elements that are needed for body processes. b. organic compounds that the body needs in small amounts to function properly. c. small molecules used to build proteins. d. an organic compound that is insoluble in water and includes fats. question 4 how many types of vitamins does the human body need? a. 15 b. 11 c. 13 d. 17 question 5 vitamins are a good source of energy. true false

Analyze the reaction to determine whether the reaction is exothermic or endothermic. explain your reasoning.