Please help a sample is in the second half life. what percent of the sample is stable at this point? 12.5%
25%
50%
75%

the correct answer is answer a. a mixture

no other options make sense

hope this

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  - sprinkles

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e

o conteúdo de calor de um sistema é igual à entalpia apenas para um sistema que é constante

the answer is c

tell me if wrong