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nlexa [21]
3 years ago
9

(I will give brainliest, ONLY if its correct!)

Chemistry
2 answers:
ryzh [129]3 years ago
7 0

Answer:

easy

Explanation:

In physics and chemistry, the law of conservation of energy states that the total energy of an isolated system remains constant; it is said to be conserved over time. This law means that energy can neither be created nor destroyed; rather, it can only be transformed or transferred from one form to another.

LekaFEV [45]3 years ago
3 0

Answer:

-  Energy is not created or destroyed

- Energy only transforms

Explanation:

Law of conservation of energy. It constitutes the first principle of thermodynamics and states that the total amount of energy in any isolated system (without interaction with any other system) remains unchanged over time, although such energy can be transformed into another form of energy.

The law of conservation of energy states that nothing exists and can not exist capable of generating energy, there is neither can exist anything capable of making energy disappear and finally if it is observed that the amount of energy varies, it will always be possible to attribute said variation to an exchange of energy with some other body or with the surrounding environment.

Energy is the ability of bodies or systems of bodies to perform a job. Every system that passes from one state to another produces physical or chemical phenomena that are nothing more than manifestations of some transformation of energy, since this can occur in different forms: kinetic, potential, electrical, mechanical, chemical. Whenever an amount of one class of energy is produced, an exactly equivalent amount of another class or classes should be consumed.

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The molar heat of vaporization of water is 40.7kJ/mol. How much heat must be absorbed to convert 50.0 grams of liquid water at 1
EleoNora [17]
During a phase change the temperature does not change since all of the heat is being absorbed in order to break the intermolecular forces.  Due to that, the formula will not need to have T in it and is actually q=nΔH(v).
n=the number of moles (in this case 2.778mol of water since you divide 50g by 18g/mol).
ΔH(v)=the molar heat of vaporization (in this case 40.7kJ/mol).
q=the heat that must be absorbed
q=2.778mol×40.7kJ/mol
q=113.1kJ
Therefore the water needs to absorb 1.13×10²kJ.

I hope this helps.  Let me know if anything is unclear.

4 0
3 years ago
Whats the name?!?!?!??!?!?!?!?!?!?!!?!?!?!??!?!?!?!
SIZIF [17.4K]
Hydrogen i suppose is the right one
7 0
3 years ago
The smallest unit of a compound is called a ___________.
Oxana [17]
<span>The smallest unit of a compound is called a molecule. The correct option among all the options that are given in the question is the second option or the penultimate option or option "B". The other choices are incorrrect and can be negated. I hope that this is the answer that has actually come to your desired help.</span>
5 0
3 years ago
Consider the reaction 2Al + 6HBr → 2AlBr3 + 3H2. If 8 moles of Al react with 8 moles of HBr, what is the limiting reactant?
TiliK225 [7]

Answer:- HBr is limiting reactant.

Solution:- The given balanced equation is:

2Al+6HBr\rightarrow 2AlBr_3+3H_2

From this equation, There is 2:6 mol or 1:3 mol ratio between Al and HBr. Since we have 8 moles of each, HBr is the limiting reactant as we need 3 moles of HBr for each mol of Al.

The calculations could be shown as:

8molAl(\frac{6molHBr}{2molAl})

= 24 mol HBr

From calculations, 24 moles of HBr are required to react completely with 8 moles of Al but only 8 moles of it are available. It clearly indicates, HBr is limiting reactant.

7 0
3 years ago
A chemist measures the energy change ?H during the following reaction:
slamgirl [31]

Answer:

Endothermic

It absorbs heat

1.20 × 10³ kJ

Explanation:

Let's consider the following thermochemical equation.

2 H₂O(l) → 2 H₂(g) + O₂(g)    ΔH = 572 kJ

Since ΔH > 0, the reaction is endothermic, that is, it absorbs heat when H₂O reacts.

572 kJ are absorbed when 36.03 g of water react. The heat absorbed when 75.8 g of H₂O react is:

75.8 g H₂O × (572 kJ/36.03 g H₂O) = 1.20 × 10³ kJ

5 0
3 years ago
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