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Elodia [21]
3 years ago
5

BRAINLEIST!!!!! A 1 kg block of copper is put in 1 kg of water, inside a glass jar of 0.5kg.

Chemistry
2 answers:
DerKrebs [107]3 years ago
6 0

Answer:

51000 J

Explanation:

Change in energy = Mass × Specific Heat Capacity × Change in Temperature

→ Change in energy is measured in joules (J)

→ Mass is measured in kilograms (kg)

→ Specific heat capacity is measured in joules per kilogram per degree Celsius (J/Kg°C)

→ Temperature change is measured in degrees Celsius (°C)

Change in energy for copper = 1 × 390 × 10 = 3900 J/Kg°C

Change in thermal energy for water = 1 × 4180 × 10 = 41,800 J/Kg°C

Change in thermal energy for glass =  1 × 840 × 10  = 8,400 J/Kg°C

Add them all up to get the total energy

3900 + 41800 + 8400 = 51000 J

Cerrena [4.2K]3 years ago
3 0

Q = mc∆T

m = mass

c = specific heat capacity

∆T = change in temperature

Q = mass x specific heat x change in temperature

Q1 = 1 * 390 * 10 = 3900

Q2 = 1 * 4186 * 10 = 41,860

Q3 =  1 * 840 * 10  = 8,400

Add them all up to get the total energy needed to increase the temperature of the whole set by 10°C.

3900 + 41860 = 45,760

45,760 + 8,400 = 54,160

Therefore, 54,160J is needed to increase the temperature by 10°C.

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In the following redox reaction which is the oxidizing agent and which is the reducing agent? AlCl3 + Na NaCl + Al
horrorfan [7]

Answer :  Al

Explanation :

- For a given redox reaction there must be an oxidizing agent/(s) and a reducing agent/(s).

- the oxidizing agent is the substance that undergoes reduction process (gaining electrons or loss of oxygen atoms), meanwhile, the reducing agent is the substance that undergoes oxidation process (loss of electrons or gaining of oxygen atoms).

- In the reaction above, the oxidation number of (Al) in AlCl3 is (3+). However, the oxidation number of (Al) in the products is zero because it exists as a single element.

Therefore, changing from (3+) to zero means gaining of (3) electrons to neutralize the previously existing (3) protons on (Al) in AlCl3.

So Al is the oxidizing agent..


4 0
3 years ago
The boiling points for the homonuclear diatomic molecules in the halogen family are 85 K, 238 K, 332 K, 457 K and 610 K. Which s
patriot [66]

Answer:

Cl_{2} has boiling point of 238 K

Explanation:

Boiling point depends on different intermolecular force such as molecular wight, dipole-dipole attraction force, hydrogen bonding, ionic attraction force.

Homonuclear diatomic molecules are covalent non-polar molecules and thereby free from dipole-dipole attraction force, hydrogen bonding and ionic interaction forces.

Hence, boiling point of homonuclear diatomic molecules depends solely on molecular weight.

We know, higher the molecular weight of a molecule, higher will be its boiling point. This phenomenon can be realized in terms of increasing london dispersion force with increase in molecular weight.

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I_{2} > Br_{2} > Cl_{2} > F_{2}

So, decresing order of boiling point of halogen molecules:

I_{2} > Br_{2} > Cl_{2} > F_{2}

Hence Cl_{2} has boiling point of 238 K

4 0
3 years ago
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Alona [7]

A compound is a pure substance composed of two or more different atoms chemically bonded to one another. A compound can be destroyed by chemical means. It might be broken down into simpler compounds, into its elements or a combination of the two.


8 0
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Answer:

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= 95

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= 11.305 g

4 0
3 years ago
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lyudmila [28]

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8 0
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