What is the amount of heat absorbed when the temperature of 75 grams of water increases from 20.°C to 35°C
2 answers:
Answer:
<u><em>4.704625 kJ (or 4704.625 J) </em></u> is the amount of heat absorbed when the temperature of 75 grams of water increases from 20.°C to 35°C.
Explanation:
The measurement and calculation of the amounts of heat exchanged by a body or system is called calorimetry.
In this way, there is a direct proportionality relationship between heat and temperature. The constant of proportionality depends on the substance that constitutes the body as its mass, and the product of specific heat is produced by the body's mass. So, the equation that allows to calculate heat exchanges is:
Q = c * m * T
Where Q is the heat exchanged for a body of mass m, constituted by a specific heat substance c and where T is the temperature variation.
In this case:
- The specific heat capacity (c) of water is 4,181 J / g°C
- m=75 g
- T=35°C - 20°C ⇒ T= 15°C
Then:
Q≅4704.625 J
Being 1 kJ = 1000 J:
Q=4.704625 kJ
Finally, <u><em>4.704625 kJ (or 4704.625 J) is the amount of heat absorbed when the temperature of 75 grams of water increases from 20.°C to 35°C</em></u>
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Answer:
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Answer:
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Any group that contains an empty orbital in its valence shell can be considered a Lewis acid, but the bases do not differ in the Brønsted system from those in the Lewis system. Thus, acids are divided into types, including:
Simple Cations
Theoretically, they can be considered as acids and therefore we can also expect their acidic strength to increase for the following reasons:
1. By increasing the positive charge on the cation.
2. Increasing the charge of the nucleus from one atom to another in any period in the periodic table.
3. By decreasing the radius of the cation.
4. Decrease in the number of electron shells in the cation.
Therefore, the acidity of cations of any chain of transition elements increases with increasing atomic number when their positive charge is equal. There are some examples that show the reaction of cations as Lewis acids:
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b) aluminum ion hydration
c) Adding alcohol to the lithium ion
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I hope I helped you^_^
