A hypothesis is based on _ variable is the one that you are changing in the experiment?​

What is the chemical formula of magnesium bromide? a. mgbr2 b. mgbr c. mg2br2 d. mg2br

When the ionic compound nabr dissolves in water, br– ions are pulled into solution by the attraction between what two particles? a. the na+ and br– ions b. the na+ ion and the negative end of a water molecule c. the br– ion and the positive end of a water molecule d. the br– ion and the negative end of a water molecule

Amatch has about 21 milligrams of red phosphorus coating the tip. how many atoms of phosphorus is this?