Which phrase best describes this reaction? (1.) endothermic with ΔH = +1640 kJ (2.) endothermic with ΔH = -1640 kJ (3.) exothermic with ΔH = +1640 kJ (4.) exothermic with ΔH = -1640 kJ

Which equation represents a fission reaction? o "9n+h—150 o 235u + n—190cs + rb+25 o be + he—1c + in o 28 np —> 2390 pute

21. consider the following chemical reaction: n2+ o2 2 no if 10.0 g of n2 reacts with excess oxygen then how many grams of no can be formed? a) 10.7 g b) 21.4 g c) 32.9 g d) 42.8 g page 4 of 8

Which describes fat? a: a carbohydrate that produces energy b: a nucleic acid that directs cell function c: a lipid that stores energy d: a protein that speeds up a chemical reaction