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alisha [4.7K]
3 years ago
10

¿Cuánto calor es necesario suministrar a 2 kilogramos de aluminio para que eleve su temperatura 20°C?

Chemistry
1 answer:
solong [7]3 years ago
4 0

How much heat is necessary to supply 2 kilograms of aluminum to raise its temperature by 20 ° C?

Answer:

36000J

Explanation:

Given parameters:

Mass of aluminum = 2kg  = 2000g

Temperature rise  = 20°C

Unknown:

Amount of heat needed for the temperature change  = ?

Solution:

The amount of heat needed to cause this temperature rise is given as;

           H = m c (T₂ - T₁)

H is the amount of heat

m is the mass

c is the specific heat of aluminum = 0.9J/g°C

Insert the parameters and solve;

       H  = 2000 x 0.9 x 20 = 36000J

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Corrections here: 1. When calcium reacts with water, the temperature changes from 18c to 39c
Ugo [173]

When calcium reacts with water, the temperature changes from 18c to 39c is an exothermic reaction as energy is releasing and increasing the temperature.

<h3>What is an exothermic reaction?</h3>

Exothermic reaction are those reactions in which energy is released when a reaction completes.

An example is burning of wood.

Thus, when calcium reacts with water, the temperature changes from 18c to 39c is an exothermic reaction as energy is releasing and increasing the temperature.

Learn more about exothermic reaction

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3 0
2 years ago
How many moles are in 7.6 g of Ca
klasskru [66]

Your answer would be 0.024951344877489 but rounding it would be 0.025 moles

7 0
3 years ago
Question 34 (1 point)
Grace [21]

Answer:

8.33 atm

Explanation:

Xe is   5  out of (4+5)   or   5 / 9 ths of the gas present

  5/9  * 15 atm = 8.33 atm

4 0
2 years ago
View the diagram below
Sauron [17]

Answer : The correct answer is the Bonds were broken on the reactants and new bonds were formed on the products.

Explanation :

In the chemical reaction, some substances react together are called reactant and the substance are formed are called product.

During the chemical reaction, the atoms of reactants rearranged to make products. There are on atoms are added or taken away in the reaction. This is known as the conservation of atoms.

For example : carbon atom react with the oxygen to form carbon dioxide.

C+O_2\rightarrow CO_2

From the given diagram, we conclude that the arrangement of molecules are different on both side of the mixture of reaction.

On the reactant side, the red molecules bonded with red molecule and the black molecule with white molecules. On the other hand i.e product side, the red molecule bonded with black molecule and white molecule bonded with red molecules. The molecular arrangement are different on both side of the reaction mixture.

Therefore, the correct answer is the Bonds were broken on the reactants and new bonds were formed on the products.


6 0
4 years ago
What is a similarity between wind and water?
labwork [276]
They are both sources of power for objects that people use.
5 0
3 years ago
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