20. The following reaction: 4 Al + 3 O2 ? 2 A120, is an example of A. combinatio
ID: 706404 • Letter: 2
Question
20. The following reaction: 4 Al + 3 O2 ? 2 A120, is an example of A. combination. B. decomposition. C. single-displacement D. double-displacement. . The reaction: CH4+202 A. endothermic. 21. CO2 +2 H2O+890.4 kJ, is B. exothermic. C. isothermic. D. protothermic. The reaction: N2 + 02 + 182.6 kJ- A. endothermic. 22. 2 NO is B. exothermic. C. isothermic. D. protothermic. 23. In the expression, 2 AICI, A. 2 and 3 are subscripts C. 2 is a subscript and 3 is a coefficient B. 2 and 3 are coefficients D. 3 is a subscript and 2 is a coefficient In the expression, 3 CaBr2, A. 2 and 3 are subscript:s C. 2 is a subscript and 3 is a coefficient 24. B. 2 and 3 are coefficients D. 3 is a subscript and 2 is a coefficient 25. In the following reaction: KOH+ CuNO; KNOs+ CuOH B. KNOs and CuOH are reactants D. KOH and CuNOs are reactants A. KOH and KNO3 are reactants C. CuOH and KOH are products In the following reaction: Ba + Mgo A. Mg and BaO are products Mg+ Bao B. Mg and MgO are products D. Ba and Mg are products 26. C. Ba and MgO are products The products of the complete combustion of the hydrocarbon methane are A. carbon monoxide and water. 27. B. carbon dioxide and water. D. carbon dioxide and hydrogen. C. carbon monoxide and hydrogen.Explanation / Answer
21.combination reaction.(A) is correct
22.exothermic. (B) is correct.
23. endothermic. (A) is correct.
24.(C) is correct.
25. (D) is correct option.
26. (A) is correct option.
27. (B) is correct option.
Reactants are the back part of arrow and front part of arrow are products in a chemical reaction.
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