aylineorozco836

04.07.2019 • 

Mathematics

9) how do you know a chemical change has occurred? a. new bonds have formed or bonds have broken. b. the matter has had a change in state. c. the temperature has changed. d. all of the above e. only a and c are indicators of a chemical change. ! 15 pts 10) if a chemical bond is formed or destroyed, what changes? a. energy is absorbed or released. b. protons are absorbed. c. neutrons will vary. d. energy is destroyed. e. protons are released.

Ответ:

areeves39276

25.05.2020

Mathematics

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9)=A These two are indications of a chemical change. (I am positive it is A)
10)=A It is not D and the others don't seem as right so I hope this helps.

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Ответ:

721345

01.07.2022

Mathematics

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-28/71; Combine like terms first,

3x-74x=28

-71x=28

Now just divide -71 to isolate the variable and find x

x=-28/71

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