iron(iii) oxide is formed when iron combines with oxygen in the air. how many grams of fe2o3 are formed when 20.5 of fe reacts completely with oxygen? 4fe(s) +3o2(g) → 2fe2o3(s)

Pls! plant cells and animal cells were observed under a microscope. the characteristics of two cells are listed below. cell p: does not capture sunlight cell q: has cytoplasm but no chloroplast which statement about the two cells is correct? cell q also has a cell wall. cell q also has large vacuole. cell p also has a large vacuole. cell p also has a cell membrane.

What does the symbol (–hfus) indicate in a phase change?

110 g of water (specific heat = 4.184 j/g c) and 100 g of a metal sample (specific heat = 0.397 j/g c) are heated from 25 degrees c to 75 degrees c. which substance required more thermal energy?