Scioly.org

Zest wrote:ok, thanks,
so the only way to test this is if you have a thermometer and we aren't allowed to briing it, so it dpends if the supervisor provides it?

They probably will provide it if they want you to test for exo and endo.

Zest wrote:what does it mean if a substance disolves endothermically or exothermically?

If a substance dissovles endothermically, that means when it was dissolved that the tempurature changed to a higher degree, and if it dissolved exothermically, that means that when it was dissolved the tempurature changed to a lower degree

geekychic13 wrote:

Zest wrote:what does it mean if a substance disolves endothermically or exothermically?

If a substance dissovles endothermically, that means when it was dissolved that the tempurature changed to a higher degree, and if it dissolved exothermically, that means that when it was dissolved the tempurature changed to a lower degree

You seem to have those backwards
Endothermic means that energy is being added to the reactants side therefore the temperature will drop.
Exothermic means that energy is on the products side therefore temperature will rise.

I use the first three letters to remember than endo/en as in enter and exo/ex as in exit

ok thanks

What does endothermically and exothermically mean?

audreylee25128 wrote:What does endothermically and exothermically mean?

If something occurs endothermically, it involves the absorption of thermal energy into chemical energy causing a decrease in temperature. Exothermically means the exact opposite, the release of thermal energy from chemical energy resulting in an increase in temperature.

are we allowed to bring a scoop even though it is not listed on the rules sheet?

Schrodingerscat wrote:

audreylee25128 wrote:What does endothermically and exothermically mean?

If something occurs endothermically, it involves the absorption of thermal energy into chemical energy causing a decrease in temperature. Exothermically means the exact opposite, the release of thermal energy from chemical energy resulting in an increase in temperature.

Just a small clarification: endothermic reactions involve a decrease in temperature in the surroundings. So, if the reaction occurs in solutions in water, heat is absorbed by the chemical reaction from the water, making the water colder, but the actual chemicals warmer. Likewise, in exothermic reactions, heat is absorbed by the water from the chemical reaction, making the water warmer. So yes, you're right, but I just want to avoid any misconceptions.

robotman09 wrote:

geekychic13 wrote:

Zest wrote:what does it mean if a substance disolves endothermically or exothermically?

If a substance dissovles endothermically, that means when it was dissolved that the tempurature changed to a higher degree, and if it dissolved exothermically, that means that when it was dissolved the tempurature changed to a lower degree

You seem to have those backwards
Endothermic means that energy is being added to the reactants side therefore the temperature will drop.
Exothermic means that energy is on the products side therefore temperature will rise.

I use the first three letters to remember than endo/en as in enter and exo/ex as in exit

thanks I remember the same way for exit, but I thought that meant heat was exiting, so it would be colder.
Obviously, dictionary.com confused me.

EASTstroudsburg13 wrote:

Schrodingerscat wrote:

audreylee25128 wrote:What does endothermically and exothermically mean?

If something occurs endothermically, it involves the absorption of thermal energy into chemical energy causing a decrease in temperature. Exothermically means the exact opposite, the release of thermal energy from chemical energy resulting in an increase in temperature.

Just a small clarification: endothermic reactions involve a decrease in temperature in the surroundings. So, if the reaction occurs in solutions in water, heat is absorbed by the chemical reaction from the water, making the water colder, but the actual chemicals warmer. Likewise, in exothermic reactions, heat is absorbed by the water from the chemical reaction, making the water warmer. So yes, you're right, but I just want to avoid any misconceptions.

That description is slightly inaccurate as well. Endothermic reactions do remove heat from the surroundings and decrease the temperature. However, they do not become hotter in the sense of increasing in temperature as the thermal energy of the heat becomes stored in chemical energy. Both the temperatures of the chemical and the surrounding water will decrease in an endothermic reaction.