An experiment requires you to use 2.95 x 1023 formula units of sodium phosphide. In order to obtain the correct amount of sodium phosphide, you need to determine the mass, in grams. Which correctly represents the mass in grams of the sodium phosphide?
65.3 g of sodium phosphide
18.6 g of sodium phosphide
49.0 g of sodium phosphide
25.4 g of sodium phosphide

- "the choice that is not an indicator of a chemical change is "state of matter changes". more common than not, chemical reactions produce energy in the form of light or heat. along with energy, they also produce a new substance called the product that could be in any state of matter (solid, gas, or liquid)."

d. temperate deciduous forest

quartz

explanation:

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."