Which of the following statements is true? (Several options can be specified.) a.The stoichiometric coefficient of a compound is the number in front of the compound in the reaction formula. The coefficient is negative for a reactant and positive for a product. b.Reaction heat is the heat development that occurs during a chemical reaction. c.When a gas is heated, the enthalpy content decreases. d.Entalpine changes during phase transformation (for example when iron melts or water evaporates). e.In an endothermic reaction, heat develops.

Q: Write the balanced equation of the reaction between lead ion(II) and phosphate ion to form a neutral…

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Q: Which law of physics states "For a given reaction, all components of the reactants can be accounted…

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Q: . Na  H2O S NaOH  H2 24. KClO3 S KCl  O2 25. Fe3O4  C S Fe  CO 26. C5H8  O2 S CO2  H2O 27. Cu…

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Q: A student followed the procedure in this experiment, using 49.20 mL of 1.031 molar HCl and 50.50 mL…

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Q: • C. Decomposition

A: As there is one molecule is breaking into two molecules. So, it is Decomposition reaction.

Q: Give 2 examples of exothermic and endothermic reactions

A:

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A:

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A: Yes, Option  D would be the right answer .

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Q: what is the percent yield of the reaction of 3.75 g of NO are formed?

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Q: On what law is stoichometry based, and how do thecalculations support this law?

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Q: ΔHneut

A:

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A:

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A:

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A:

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A:

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A:

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A:

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Group 15 elements

The elements of group 15 are phosphorus, nitrogen, bismuth antimony, and arsenic. The most abundant element which is present in the air is nitrogen and the percentage of nitrogen present in the air is 78%. In the free state, the elemental nitrogen is present as diatomic gas (N2). In the organic matter obtained from plants and animals, phosphorus is the dominant element present. In nucleic acids, phosphate groups are present. Phosphates are also found in teeth and bones. The other elements arsenic, bismuth, and antimony are found as sulfides. Arsenopyrite, bismuth glance, and stibnite are examples of sulfides of arsenic, bismuth, and antimony respectively.