Magnesium is a medication used as a mineral supplement used to prevent and treat low levels of minerals in the blood. When magnesium (Mg) reacts with oxygen (O2 ) it forms magnesium oxide (MgO) __2_Mg + ___ O2 __2_ MgO
If 25g of Mg reacts with O2, and 100 g of MgO is formed, how much O2 was needed?

Which of these is not an example of chemical weathering? a. iron-rich mineral rusting b. feldspar turning into clay c. limestone reacting with acid d. granite breaking up into sand

100 grams of molten lead (600°c) is used to make musket balls. if the lead shot is allowed to cool to room temperature (21°c), what is the change in entropy (in j/k) of the lead? (for the specific heat of molten and solid lead use 1.29 j/g⋅°c; the latent heat of fusion and the melting point of lead are 2.45 × 104 j/kg and 327°c, respectively.)

Which statement names the physical property of wood a. wood is softer than coal b. wood does not rust c. wood can rot d. wood can burn