science

Which result occurs during an exothermic reaction?

A.Light is released into the environment, while heat is absorbed.
B.Light and heat are absorbed from the environment.
C.Heat is released into the environment, while light is absorbed.
D.Light and heat are released into the environment.

Which event is an example of an endothermic reaction?

A.photosynthesis
B.condensation
C.rusting of iron
D.burning wood

How is total reaction energy calculated?

A.reactant bond energy – product bond energy
B.product bond energy ÷ reactant bond energy
C.product bond energy × reactant bond energy
D.product bond energy × reactant bond energy

When producing hydrogen iodide, the energy of the reactants is 581 kJ/mol, and the energy of the products is 590 kJ/mol. The equation is shown.

H2 + I2 → 2HI

What is the total energy of the reaction? Is this an endothermic or exothermic reaction?

A.When producing hydrogen iodide, the energy of the reactants is 581 kJ/mol, and the energy of the products is 590 kJ/mol. The equation is shown.

H2 + I2 → 2HI
A.–9 kJ/mol, endothermic
B.9 kJ/mol, endothermic
C.9 kJ/mol, exothermic
D.9 kJ/mol, exothermic

Hydrogen bromide breaks down into diatomic hydrogen and bromine in the reaction shown.

2HBr → H2 + Br2

The energy of the reactant is 732 kJ/mol, and the energy of the products is 630 kJ/mol.
What is the total energy of the reaction? Is this reaction endothermic or exothermic?

A.102 kJ/mol, exothermic
B.102 kJ/mol, endothermic
C.–102 kJ/mol, endothermic
D.–102 kJ/mol, exothermic

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  1. We are here to help you if you are stuck, not to do your work for you. I studied this material in 1956 and do not need practice.

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  2. I gotchu!
    1.) D
    2.) A
    3.) C
    4.) A
    5.) D

    these answers are correct trust me :)

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  3. Willow's wrong...

    1.) C Light and heat are released into the environment.
    2.) A photosynthesis
    3.) B reactant bond energy – product bond energy
    4.) C –9 kJ/mol, exothermic
    5.) C 102 kJ/mol, endothermic

    Your welcome,

    -GI Joe

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  4. GI joe is right

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  5. thx GI Joe is right im sooooooooooooo happppppyyyyyyy
    *spam required*
    hegwbkchvjevhj,enjvjrlvjbhhjbhjbbjbvhjhrbjlehuiunyeyfyb

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  6. Can confirm 100%
    Thx!!!

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  7. GI Joe thank you
    do people know that the answers change around for everyone lol

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  8. yeahh i found that out the hard way...

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  9. Tyyy

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  10. If you are in my Alegebra 2 Class and use this

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  11. GI Joe is right

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  12. TYTYTY GI JOE!!!! aaaaa <3

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  13. Total Bond Q.C.

    100% correct
    1: B (Light or heat are released into the environment.)
    2: B (photosynthesis)
    3. B (reactant bond energy – product bond energy)
    4. D (–9 kJ/mol, exothermic)
    5. C 102 kJ/mol, endothermic

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  14. If u don't have question 3, and have a different question 5 instead, then the answer is:
    467 kJ/mol; lose heat

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  15. Thank you soo much Tea!!!

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