Ethanol is added to gasoline because the oxygen it contains improves gasoline's burning efficiency. its combustion reaction is given below. ch3ch2oh(l) 3o2(g) → 2co2(g) 3h2o(g) ∆h
a) is this an exothermic or endothermic reaction? b) if 15.3 grams of pure ethanol is completely converted to products, calculate how much heat is absorbed or released, in (1) kj and in (2) kcal. c) if 42.7 g of water vapor is produced, how much heat, in kl, is absorbed or released?

because u need two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei to form isotopes.

so since they all have the same shape? i mean maybe because m& m and reeses are both chocolates

under a microscope, cancer cells may look very different from normal cells. they often have different sizes and some may be larger than normal while others are smaller. cancer cells are often abnormally shaped and the control centre of the cell (the nucleus) may have an abnormal appearance.

i think? ?