determinar el porcentaje en masa de 21 g de arena en una mezcla de 50 g de arcilla, 21 g de arena y 12 g de limo

Astudent is trying to create a table that compares hypotheses, theories, and laws. hypothesis theory law do scientific researchers formulate it? yes yes yes does it explain why things happen? yes yes no yes yes yes is it used to make predictions? no yes yes which of the following questions would most likely fill the blank in the table? is it an intelligent guess? is it newly formulated? is it based on observations? has it been proved?

Which property of a rock remains unchanged by mechanical weathering? a. total surface area b. size and shape c. mineral composition d. sharpness

Use the half-reactions of the reaction au(oh)3 + hi -> au +i2 +h2o to answer the questions