Can someone help me with Chemistry? I cannot get help from them. Which reactions are endothermic?

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Can someone help me with Chemistry? I cannot get help from them. Which reactions are endothermic?

Mathematics
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Endothermic means that heat is absorbed. You have checked the equations where heat is one of the products.
Ok but, my lesson says that I missing some, and some are wrong.

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The first one and the third one are endothermic. The heat should be on the left as one of the reactants. If it is on the right, it would be negative.
Ok so which one is wrong? I really hate this.
There are 5 boxes|dw:1326855774865:dw|
Ok, thanks, Can you help me with another?
Maybe. If I remember enough chemistry.
I can't see the choices. The menu won't work.
What do you mean?
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It won't let me see the choices.
Oh they are all these two options. endothermic/ exothermic
1. exothermic 2. Exothermic 3. endothermic 4. endothermic 5. endothermic 6 endothermic 7. endothermic 8. exothermic
Alright let me try these. lol
Umm again I have three of them wrong... I had three before as well.
Well I'm not sure what those E1 and E2 mean. Do you know?
No my lesson sucks at telling me.
Did you have the same as I had for the E questions?
Yes
How many chances do you get?
3 chances.
So you have one more chance?
Yea
Well if it were me, I'd switch the E questions and I'm not sure about the other one. I could do a little internet research.
I am doing it too not finding an retriceload of information though.. . Try it though,
If the environment becomes hotter, we have an exothermic reaction.
Yup I got that.
So 3 and 7 must both be exothermic because it says that the final temp is greater.
A reaction is overall exothermic if more energy is released when new bonds form in products than is used when bonds in the reactants are broken.
Are you there?
I think you should change 3 and 7 and 8
Yeah I am here.
I am thinking.

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