Calcium phosphide is used in fireworks, torpedoes, self-igniting naval pyrotechnic flares, and various water-activated ammunitions. The reaction of calcium phosphide is represented by the following equation: Ca3P2 (s) + 6H2O(1) → 3Ca(OH)2(s) + 2PH3 (g)A,H = -717.4kJ When 5.0 g of calcium phosphide is placed into 150 mL of calorimeter water, it is expected that the calorimeter water will: Select one: decrease in temperature because this is an endothermic reaction. decrease in temperature because this is an exothermic reaction. increase in temperature because this is an exothermic reaction. increase in temperature because this is an endothermic reaction. If the calorimeter water was originally at 21.5°C, the final temperature of the calorimeter water is calculated to be Select one: O -9.83°C 31.3°C 52.8°C 9.83°C

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Introduction to chemistry

Chemistry is a branch of science that deals with the analysis of material and the substances that comprise it. It also manages the properties of these substances and their reactions to form new substances. It is basically centered on particles and atoms that make up components and mixtures. These chemical species will in general connect using bonds.