Read the following misconception, then correct it. To correct it fully, you must rewrite the sentence including your reasoning. Your statement should be 2-3 sentences long and may require additional research. Misconception: A type of rock can only change into another type of rock. For example, igneous rocks can only change into sedimentary or metamorphic, not another form of igneous rock. Help please

Can someone me with 3 and 4 plz. this is for masteries test.

If a sample of radioactive isotopes takes 600 minutes to decay from 400 grams to 50 grams, what is the half-life of the isotope?

Astudent made the lewis dot diagram of a compound as shown. mg is written with two dots shown on its top. an o is written on each side of mg. each o has six dots around it. an arrow is shown from one dot on mg toward the vacant space around the o on the right. another arrow is shown from the other dot on mg toward the vacant space around the o on the left. the title of the art is students lewis dot model. what is the error in the lewis dot diagram? an o atom should transfer all its six electrons to mg because the formula is mgo. both electrons of mg should be transferred to one o atom because the formula is mgo. the electrons should be transferred from each o atom to mg because mg has fewer electrons. the number of dots around mg should be four because it has to transfer two electrons to each o.