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Gnesinka [82]
2 years ago
13

How do you tell if a reaction is endothermic or exothermic using only the written formula

Chemistry
1 answer:
irina [24]2 years ago
6 0
You know if it's endothermic or exothermic by doing the enthalpy reaction. If the change of temperature is negative then it is exothermic, while positive is endothermic. If you get -22K then its exothermic, but if you get +22 its endothermic.
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Which of the following is the correct set up AND answer to convert 6.25 x
BlackZzzverrR [31]

Answer:

Explanation:

How many mols do you have?

1 mol = 6.02 * 10^23 atoms

x mol = 6.25 * 10 ^32 atoms

1/x = 6.02*10^23 / 6.25 * 10^32        Cross multiply

6.02 * 10^23 * x = 1 * 6.25 * 10^32    Divide by 6.02 * 10^23

x = 6.25 * 10*32/ 6.02 ^10^23

x = 1.038 * 10^9 mols which is quite large.

Find the number of grams. (Use the value for copper on your periodic table. I will just use an approximate number.)\

1 mol of copper = 63 grams.

1.038 * 10^9 mols of copper = x

1/1.038 * 10^9 = 63/x         Cross multiply

x = 1.038 * 10^9 * 63

x = 6.54 * 10^10 grams of copper.

7 0
3 years ago
What is the purpose of attaching the clip/ clamp with graphite of the the pencil to the battery?
Sonja [21]
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4 0
3 years ago
PLEASE HELP ME ASAP!!! 10 POINTS!!
lapo4ka [179]

Explanation:

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4 0
3 years ago
In the presence of an emulsifying agent, a mixture of oil and water becomes a _____.
Alex Ar [27]

Answer:

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An emulsifying agent has a long non polar hydrocarbon chain (in general) and a polar head.

For example salts of fatty acids.

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Blababa [14]
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