.Assess the chemical reactions given below and answer the questions. Calcium carbonate +heat = calcium oxide + carbon dioxide Calcium oxide + water = calcium hydroxide + heat (a) Mention the reactants and products in each case. (b) Which among these is endothermic? Which one is exothermic? end

[References] Use the References to access important values if needed for this question. When HBr(g) reacts with Cl₂(g) according to the following reaction, 9.902 kcal of energy are evolved for each mole of HBr(g) that reacts. Complete the following thermochemical equation. 2 HBr(g) + Cl₂(g) → 2 HCI(g) + Br₂(g) AH = kcal

What is the heat change when 14.9 g of NH3 reacts with excess O2 according to the following equation? 4NH3 + 5O2 → 4NO + 6H2O ΔH =+ 1170kJ. Is this Endothermic or Exothermic?

I need help on this homework question... I have no idea how to do it so I would love to have all steps shown! Enthalpy stoichiometry is hard :(

A 8.27 g sample of an unknown salt (MM = 116.82 g/mol) is dissolved in 150.00 g water in a coffee cup calorimeter. Before placing the sample in the water, the temperature of the salt and water is 23.72°C. After the salt has completely dissolved, the temperature of the solution is 28.54°C. If -3.19 x 103 J of heat was lost during the dissolution reaction of 0.0708 moles of the unknown salt, what is the enthalpy change (in kJ/mol of salt) for the dissolution reaction?

A solid chemical called Instant Ice can be purchased, which when mixed with water at room temperature, produces a slushy ice-cold mixture. Which chemical process is involved (endothermic or exothermic)?

6. Use the following balanced equation to answer the questions. 2 Al(s) + 6 HCl(g) -> 3 H2(g) +2 AlCl3(aq) rxn (a) What is AH (in kJ/mol rxn) if 2.56 g of Al reacts with excess HCl, producing 159 kJ of heat? (b) What mass of H2 is produced when 105 kJ of heat is released? (c) What is the heat change when 7.00 g of AlCl3 is formed?

I just need questions d, e, f. Thank you.

Which statement about the reaction illustrated in the diagram is true? (B). (A] (C) (D) (E) O The energy required to break the bonds is more than the energy released upon forming new bonds. The energy required to break the bonds is less than the energy released upon forming new bonds. O No heat is required to start the reaction. The reaction is endothermic.

If 0.24 mols of substance B is able to produce 137J of heat. What is the change in reaction enthalpy in J associated with the following balanced reaction. (Hint: *pay attention the the coefficient for substances B *determine the sign for heat, is it + or -). Round and report your answer to an integer without decimal place including + or- - sign. Only enter numeric value, no unit. A+2B → AB2 + heat AHren =???