Pick one or more of the following combinations to investigate in this activity.
vinegar and baking soda (nahco3)
room temperature water and powdered washing soda (na2co3)
vinegar and table salt (nacl)
what chemical combination did you investigate?
did the observed temperature of the solution increase or decrease?
based on your observation, was the reaction endothermic or exothermic? explain your answer using complete sentences.
describe in detail the relationship between chemical bonds and energy. what must be true of the bonds for a reaction to be endothermic and what must be true for the reaction to be exothermic?

Apackage contains 1.33 lb of ground round. if there’s 29% fat, how many grams of fat are in the round? i got 175 g but the textbook says the answer is 91 g of fat. how?

The earth's moon is unusually large. two popular theories of the moon's origin include the "sister world" hypothesis, which states that the moon formed from the same materials as the earth, near enough to the earth that they fell into orbit around each other. a second theory is the "capture" hypothesis, in which the moon formed elsewhere in the solar system, and the earth's gravity pulled it into its orbit. studies of what the moon is made of indicate that some of its materials had to come from the earth or from the same area of the solar system where the earth had formed. at the same time, the moon does not contain much of the material that makes up the earth's core, so the moon could not have formed from the same materials as the earth. how do the two facts above affect the described theories of the moon's origin? a. they show that scientists will never agree on where the moon came from. b. they show that more experiments on moon formation need to be done. c. they show that no theory accounts for the existence of the moon. d. they show that neither theory is complete and entirely correct.

Acontrol during an experiment. might change remains constant does not exist does change