Increasing the intensity and duration of an exercise program too quickly can lead to injury.

What will be the equilibrium temperature when a 245 g block of lead at 300oC is placed in 150-g aluminum container containing 82

loris [4]

Answer:

The correct approach is "12.25°C".

Explanation:

Given:

Mass of lead,

mc = 245 g

Initial temperature,

tc = 300°C

Mass of Aluminum,

ma = 150 g

Initial temperature,

ta = 12.0°C

Mass of water,

mw = 820 g

Initial temperature,

tw = 12.0°C

Now,

The heat received in equivalent to heat given by copper.

The quantity of heat = $m\times s\times t \ J$

then,

⇒ $245\times .013\times (300-T) = 150\times .9\times (T-12.0) + 820\times 4.2\times (T-12.0)$

⇒ $3.185(300-T) = 135(T-12.0) + 3444(T-12.0)$

⇒ $955.5-3.185T=135T-1620+3444T-41328$

⇒ $43903.5 = 3582.185 T$

⇒ $T = 12.25^{\circ} C$

3 0

4 years ago

Will mark the BEST answer as BRANLIEST!

BigorU [14]

Answer:

1. 2Fe + 3CuSO₄ → Fe₂(SO₄)₃ + 3Cu.

2. Pb(NO₃)₂+ 2Kl → PbI₂ + 2KNO₃.

3. Mg + 2HCl → MgCl₂ + H₂.

4. H₂O → H₂ + 1/2O₂.

5. 2Mg + O₂ → 2MgO.

<h3 /><h2>explanation: 1. Combine iron and copper (II) sulfate solution. (Hint: Iron will form the iron (III) ion)</h2>

2Fe + 3CuSO₄ → Fe₂(SO₄)₃ + 3Cu.

It is a redox reaction including replacing Cu with Fe and changing their oxidation states.

That Fe replaces Cu and resulting in ferric sulfate.

2. Combine lead (II) nitrate and potassium iodide solutions.

Pb(NO₃)₂+ 2Kl → PbI₂ + 2KNO₃.

It is a double replacement reaction that lead nitrate reacts with potassium iodide resulting in lead iodide and potassium nitrate.

3. Combine magnesium metal and hydrochloric acid solution.

Mg + 2HCl → MgCl₂ + H₂.

It is a dissolution reaction that HCl dissolve Mg and resulting in Magnesium chloride and hydrogen gas is evolved.

4. Electrolysis (splitting) of water.

H₂O → H₂ + 1/2O₂.

Water electrolysis resulting in splitting of water to produce hydrogen and water.

5. Burning magnesium.

2Mg + O₂ → 2MgO.

It is a combustion reaction that Mg is burned with oxygen to produce magnesium oxide.

Explanation:1. Combine iron and copper (II) sulfate solution. (Hint: Iron will form the iron (III) ion)

2Fe + 3CuSO₄ → Fe₂(SO₄)₃ + 3Cu.

It is a redox reaction including replacing Cu with Fe and changing their oxidation states.

That Fe replaces Cu and resulting in ferric sulfate.

2. Combine lead (II) nitrate and potassium iodide solutions.

Pb(NO₃)₂+ 2Kl → PbI₂ + 2KNO₃.

It is a double replacement reaction that lead nitrate reacts with potassium iodide resulting in lead iodide and potassium nitrate.

3. Combine magnesium metal and hydrochloric acid solution.

Mg + 2HCl → MgCl₂ + H₂.

It is a dissolution reaction that HCl dissolve Mg and resulting in Magnesium chloride and hydrogen gas is evolved.

4. Electrolysis (splitting) of water.

H₂O → H₂ + 1/2O₂.

Water electrolysis resulting in splitting of water to produce hydrogen and water.

5. Burning magnesium.

2Mg + O₂ → 2MgO.

It is a combustion reaction that Mg is burned with oxygen to produce magnesium oxide.

3 0

4 years ago

Indicate how the concentration of each species in the chemical equation will change to reestablish equilibrium after changing th

Viktor [21]

Explanation:

Since this is an equilibrium problem, we apply le chatelier principle. This principle states that whenever a system at equilibrium is disturbed due to change in several factors, it would move in a way to annul such change.

C2H4(g) + Cl2 ⇔ 2C2H4Cl2(g)

When the concentration of C2H4 is increased, there is more reactant sin the system. In order to annul this change, the equilibrium position will shift to the right favoring product formation.

When the concentration of C2H4Cl2 is increased, there is more product in the system. To annul this change, the equilibrium position will shift to the left, favoring reactant formation.

7 0

4 years ago

What molecule in the atmosphere is nitrogen normally found in

lyudmila [28]

Search Results
Featured snippet from the web

It is found in amino acids that make up proteins, in nucleic acids, that comprise the hereditary material and life's blueprint for all cells, and in many other organic and inorganic compounds. In addition, nitrogen comprises about 80% of the Earth's atmosphere.

3 0

3 years ago

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Which describes the fourth state of matter known as plasma

tester [92]

an ionized gas consisting of positive ions and free electrons in proportions resulting in more or less no overall electric charge, typically at low pressures (as in the upper atmosphere and in fluorescent lamps) or at very high temperatures (as in stars and nuclear fusion reactors).

6 0

3 years ago

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