Achieve Hw (Week 3 and 4)#4

[Naibe Reynoso 2C]

How can we tell which reactions are endothermic or exothermic based on comparing bond strengths? I am having trouble identifying which reactions are endothermic and which are exothermic. If anyone could help, I would appreciate it!

[Caleb Kim 1K]

You have to know the delta H values of the bonds that are formed and broken. Breaking bonds is an endothermic process so the reactant side is all endothermic, meaning the delta H values are positive. The product side forms bonds, which means that it is exothermic so forming bonds is an exothermic process. After adding all the delta H values of the broken and formed bonds, you can determine whether the equation is exothermic or endothermic depending on whether the delta H value is positive or negative. Negative H value means that it is exothermic and endothermic has a positive delta H value.

[Cindy T 3F]

To add on, the stronger the bond that is being broken, the more energy is needed to break the bond, so the reaction will become more endothermic. The stronger the bond that is being formed, the more energy will be released, making the reaction more exothermic. By comparing the total delta H values of the broken bonds versus the total delta H values of the formed bonds, you can determine if the overall reaction is exothermic or endothermic.

[Lauren Eng 1G]

For this question, we need to look at the bond strengths of the reactants versus the bond strengths of the products. If there is a strong bond in the reactants, and it produces a weaker bond (according to the chart), it would be endothermic. This is because more energy needed to be produced to break that bond than it was to create the weaker bond.

[Sydney]

A stronger bond will require more energy to break, so a reaction where a stronger bond is being broken to form a weaker one will be endothermic, while a reaction where a weaker bond is being broken to form a stronger bond will be exothermic.

[905802613]

For this question, you have to look at the bonds on the reactant side and product side, and compare their strength. If the reactant side has stronger bonds and the product side has weaker bonds, the reaction will be endothermic. This is because strong bonds are being broken to create a weaker bond, which requires energy. If the product side has stronger bonds and the reactant side has weaker bonds, the reaction will be exothermic. This is because weaker bonds are being broken and replaced by stronger bonds, and energy is released since the bonds are stronger now and require less energy to be "held" together.

[Neha Humbe 3E]

In order to determine whether a reaction is endothermic or exothermic you have to compare the strength of bonds broken and formed on the reactant and product sides. A reaction is endothermic if the bonds on the reactant side are stronger and the bonds on the product side are weaker (this requires more energy which makes it endothermic). A reaction is exothermic if the bonds on the reactant side are weaker and the bonds on the product side are stronger (this releases energy which makes it exothermic). Hope this helps!

[Melina Reyes 2D]

I also struggled with this problem at first but was helped when it was explained that endothermic reactions have stronger bonds in its reactants and weaker bonds in its products, while exothermic reactions have weaker bonds in its reactants and stronger bonds in its products. Endothermic reactions consist of phase changes that absorb energy, including solid to liquid or liquid to gas, where there are weaker bonds in the resulting phase since the reaction required energy to break these bonds. Exothermic reactions consist of phase changes that release energy, including gas to liquid or liquid to solid, where there are stronger bonds in the resulting phase since the reaction released energy from formation of these bonds.

[Prachi Roy 2K]

The reaction is exothermic when the bonds formed (releases energy) were stronger than the bonds broken (takes energy). The reaction is endothermic when the bonds formed (releases energy) were weaker than the bonds broken (takes energy).

[205898077]

Is there only one achieve assignment for both weeks?