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LenKa [72]
3 years ago
5

Find the energy required to melt the copper once it's reached the melting point.

Chemistry
1 answer:
belka [17]3 years ago
8 0
The answer has to depend on the mass of the copper that you're trying to melt. 

But there is a formula which you can calculate the energy required if you have the information of the mass. This formula requires the value called specific latent heat of fusion, which is the energy required to melt or freeze a specific mass of copper without changing its temperature but change its state. 
E = m l_{f}
E is the total energy required, m is the mass, and lv is the specific latent heat of fusion of copper. 

Usually, in questions, lv is given. But we can also look it up online which is around 205kJ kg^-1 
this means, to melt or freeze a copper, we need to work the mass multiplied by 205kJ in order to calculate its total energy needed or released. 
You might be interested in
Which of the following describes an exothermic reaction?
sattari [20]

Answer:

The answer to your question is: second option.

Explanation:

An exothermic reaction is a reaction that releases energy to the environment.

Thermal energy is absorbed by the system. This sentence is describing an endothermic reaction.

Thermal energy is absorbed by the surroundings. This sentence is describing an exothermic reaction.

Thermal energy is not transferred.  This sentence is describing an isolated system.

The initial and final temperatures of the system remains the same. This option is incorrect is not describing an exothermic reaction.

7 0
4 years ago
Answer this please!!!
zavuch27 [327]

Answer:

c

Explanation:

7 0
2 years ago
Read 2 more answers
which statement describes all chemical changes but not all physical changes a bubbles are produced b a new substance forms c pha
kirill [66]

The correct answer is:

B; A new substance forms.

Explanation:

A physical change, such as a state change or dissolving, does not produce a new substance, but an abundant change does. In a chemical reaction, the atoms and molecules that connect with each other are described as reactants. Chemical reactions happen when chemical bonds are broken and formed. If the molecules in a substance crash into each other with enough energy, some of the bonds in the molecules can break. The atoms can make new bonds with different atoms. A new substance forms.

8 0
3 years ago
Read 2 more answers
Hello! So I need help with these neutralization reactions and its fill in the blank. The question asks,
Likurg_2 [28]

The balanced equation for the neutralization reactions is as below.

<h3>Balancing chemical reaction equations</h3>

In order for chemical equations to be balanced, the number of atoms of each element before and after the reaction must be equal.

Thus:

  • HBr + KOH --- > KBr + H_2O
  • 3HF + Fe(OH)_3 --- > 3 H_2O + FeF_3
  • 2HCl + Ca(OH)_2 --- > CaCl_2 + 2H_2O

More on balancing chemical equations can be found here: brainly.com/question/15052184

#SPJ1

5 0
2 years ago
For a certain reaction, the frequency factor A is 5.0 × 109 s−1 and the activation energy is 16.3 kJ/mol. What is the rate const
WITCHER [35]

Answer:

K(79°C) = 1.906 E7 s-1

Explanation:

Arrhenius eq:

  • K(T) = A e∧(- Ea/RT)

∴ A = 5.0 E9 s-1

∴ Ea = 16.3 KJ/mol

∴ R = 8.314 E-3 KJ/K.mol

∴ T = 79°C ≅ 352 K ⇒ K = ?

⇒ K(79°C) = (5.0 E9 s-1)e∧[ - (16.3KJ/mol)/(8.314 E-3 KJ/K.mol)(352 K)]

⇒ K(79°C) = (5.0 E9 s-1)e∧(- 5.5697)

⇒ K(79°C) = (5.0 E9 s-1)*(3.811 E-3)

⇒ K(79°C) = 1.906 E7 s-1

3 0
4 years ago
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