Ethene is the monomer that is used as the building block in polyethylene. true or false

How many Joules are released to cool 250.0 grams of liquid water from 100°C to 0°C? The specific heat of water is 4.180 J/g.C.

nlexa [21]

$\bold{\huge{\orange{\underline{ Solution}}}}$

$\bold{\underline{ Given :- }}$

We have 250g of liquid water and it needs to be cool at temperature from 100° C to 0° C
Specific heat of water is 4.180J/g°C

$\bold{\underline{ To \: Find :- }}$

We have to find the total number of joules released.

$\bold{\underline{ Let's \:Begin:- }}$

We know that,

Amount of heat energy = mass * specific heat * change in temperature

That is, 

$\sf{\red{ Q = mcΔT }}$

Subsitute the required values in the above formula :-

$\sf{ Q = 250 × 4.180 ×(0 - 100 )}$

$\sf{ Q = 250 × 4.180 × - 100 }$

$\sf{ Q = 250 × - 418}$

$\sf{\pink{ Q = - 104,500 J }}$

Hence, 104,500 J of heat is released to cool 250 grams of liquid water from 100° C to 0° C.

$\bold{\underline{ Now :- }}$

We have to tell whether the above process is endothermic or exothermic :-

Here, In the above process ΔT is negative and as a result of it Q is also negative that means above process is Exothermic

Exothermic process :- It is the process in which heat is evolved .
Endothermic process :- It is the process in which heat is absorbed .

4 0

2 years ago

A solution containing aluminium ions reacts with a solution containing hydroxide ions to form a

Xelga [282]

Answer:

D

Explanation:

the answer is d white precipitate

3 0

3 years ago

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Where are the protons and neutrons and electrons located in an atom?

Rus_ich [418]

The protons and neutrons are located in the nucleus of an atom, while the electrons are located in the orbital cloud.

8 0

3 years ago

Which of the following features is common to both acids and bases? A. ability to burn skin B. similar taste C. pH measurements g

Lynna [10]

<h3>Answer:</h3>

Correct Option-A (Ability to burn skin)

<h3>Explanation:</h3>

When skin tissues are exposed to Acids or Bases a chemical burn occurs as both of these substances are corrosive in nature. These burns occur without providing any heat, results from a very fast reaction, are extremely painful and causes damage to structures present under skin.

Option-B is incorrect because Acids taste sour, while, Bases taste bitter.

Option-C is incorrect because pH of Acids is less than 7 while, pH of Bases is greater than 7.

3 0

3 years ago

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When copper (II) chloride reacts with sodium nitrate, copper (II) nitrate and sodium chloride are formed.

anzhelika [568]

Answer:

How many grams of copper (II) nitrate is formed

3 0

3 years ago