Oh noes! i’ve stained myself with what looks like marker. what do you think is the best way to remove this stain?

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

What is a difference between a mixture of elements and a mixture of compounds

Astudent pours 10.0 g of salt into a container of water and observes the amount of time it takes for the salt to dissolve. she then repeats the process using the same amounts of salt and water but this time she slowly stirs the mixture while it is dissolving. the student performs the experiment one more time but this time she stirs the mixture rapidly. the dependent variable in this experiment is: time for salt to dissolve speed of stirring amount of water mass of salt