Question

Angel performed following experiments. Reaction 1: 2AgBr sunlight_________> Ag+Br2 Reaction2: 2Mg+02→2Mgo+Light choose the correct observation: A) Reaction 1 and 2 are both endo thermic reactions. B) Reaction 1 is exothermic reaction and Reaction 2 is endo thermic reaction. C) Reaction 1 is exothermic reaction and Reaction 2 is exothermic reaction. D) Reaction 1 is exothermic reaction and Reaction 2 is endo thermic reaction. ​

Answer 1

Answer:

Example 6

Consider this thermochemical equation.

2 CO(g) + O2(g) → 2 CO2(g) ΔH = −565 kJ

Is it exothermic or endothermic? How much energy is given off or absorbed?

Solution

By definition, a chemical reaction that has a negative ΔH is exothermic, meaning that this much energy—in this case, 565 kJ—is given off by the reaction.

Test Yourself

Consider this thermochemical equation.

CO2(g) + H2(g) → CO(g) + H2O(g) ΔH = 42 kJ

Is it exothermic or endothermic? How much energy is given off or absorbed?

Answer

Endothermic; 42 kJ are absorbed.

Explanation:

Answer 2

Answer:

ANSWER : C

Explanation:

Reaction 1 is endothermic reactionand Reaction 2 is exothermic reaction.