Energy of a system is conserved always but it can be converted to other forms . By this conversion no energy is destroying or creating. Thus, option b is correct.
What law of conservation of energy?
According to the law of conservation of energy, energy can neither be created nor be destroyed. However, it can be transformed into other forms. For instance, in light bulb, electrical energy is converting to light energy and heat energy.
Similarly, in fan and motors, electrical energy is converting to mechanical energy and in thermal power plants, thermal energy is converting to electrical energy.
In all of these cases, no amount of energy is destroying or creating. The already existing energy is transforming to various other forms.
Similarly when tow objects in contact exchange energy by mixing or any force, the energy lost from a system will be equal to the energy gained by the second system. Therefore, the total energy is conserved.
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The law of conservation of energy states that when one form of energy is converted into another, no energy is destroyed in the process. The answer is letter B. Energy cannot be created nor destroyed, it can only be converted from one form into the other.
1 mol = 6.022 x 10²³ atoms
In order to find how many atoms, dimly multiply the amount of moles you have by 6.022 x 10²³ or Avogadro's number.
So you have 1.75 mol CHC1₃ x (6.022x10²³) = 1.05385 x 10²⁴ atoms of CHCl₃
But now you have to round because of the rules of significant figures so you get 1.05 x 10²⁴ atoms of CHCl₃
The amount of heat energy needed to raise the temperature of 59.7g of cadmium from 25°C to 100°C is 1,034.3J.
The amount of heat energy needed to raise a temperature can be calculated using the following expression;
Q = mc∆T
Where;
According to this question, 59.7g of cadmium is needed to be raised from 25°C to 100°C. The amount of heat needed can be calculated as follows:
Q = 59.7 × 0.231 × (100 - 25)
Q = 1,034.3J
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(2) NaOH (4) NH4NO3
The compound whose dissolution in water will produce energy would be NaOH.
These are reactions that produce energy in the form of heat.
In other words, a reaction in which the heat is given off to the environment is said to be exothermic, whereas, the reverse is endothermic.
When NaOH is dissolved in water and the temperature of the reaction vessel is recorded, one would see that heat is given off by the dissolution process. Thus, the dissolution is exothermic.
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Answer: Option (2) is the correct answer.
Explanation:
A chemical reaction in which reactants absorb energy is known as an endothermic reaction. Also, in this reaction energy of reactants is less than the energy of products.
For example, when ammonium chloride is dissolved in water then the solution becomes cold as the reaction is endothermic in nature.
Whereas a chemical reaction in which energy is released is known as exothermic reaction. Also, in this type of reactions energy of reactants is more than the energy of products.
For example, when NaOH is dissolve in water then heat is released as it dissociates into sodium and hydroxide ions. Further, product formed that is, species sodium and hydroxide ions acquire low energy state. Hence, the reaction is exothermic in nature.
Thus, we can conclude that NaOH is the compound in which process of dissolving in water is exothermic.
The decomposition of Nickel(II) hydroxide produces Nickel(II) oxide and water. The chemical equation is: Ni(OH)2 (s) → NiO (s) + H2O (l).
The decomposition reaction of Nickel(II) hydroxide into Nickel(II) oxide and water can be written as follows: Ni(OH)2 (s) → NiO (s) + H2O (l) . In this reaction, solid Nickel(II) hydroxide decomposes into solid Nickel(II) oxide and liquid water. It’s important to remember that in these reactions, a single, complex reactant breaks down into multiple, simpler products.
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Answer:
Q = 1760 cal or 7356.8 J
Explanation:
The general expression to use to calculate heat is the following:
Q = m*Cp*ΔT (1)
Where:
Q = heat in cal or joules
m = mass of the compound.
Cp = specific heat of the compound
T: change in temperature (K) or T2 - T1
Now, the reported Cp for water is 1 cal/g °C and 4.18 J / g °C, we will use both to calculate the heat in calories and joules:
Using calories we have:
Q = 32 * 1 * (80 - 25)
Q = 1760 cal
This is the heat in calories.
Using joules we have:
Q = 32 * 4.18 * (80 - 25)
Q = 7356.8 J
This is the heat expressed in Joules.