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cluponka [151]
3 years ago
14

Which of the following statements is the most accurate? A. Energy transfers are never 100% efficient. B. Energy transfer is comp

letely efficient. C. Energy cannot be transferred to other forms. D. Energy transfers can be used to create perpetual-motion machines.
Chemistry
2 answers:
qaws [65]3 years ago
6 0
I'd say it's A because while the energy cannot be lost, it can not be 100% efficient because if it was we wouldn't have to worry about energy.
Olegator [25]3 years ago
5 0

Answer:

A. Energy transfers are never 100% efficient

Explanation:

According to the  first law of thermodynamics energy can neither be created nor destroyed but it can be converted from one form to another. According to the second law of thermodynamics transfer of energy is never 100% efficient in a machine. There is always loss of energy due to wear and tear of the machinery.

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Mixture are combination of two or more substances that can be​
ryzh [129]

Answer:

A mixture is the physical combination of two or more substances in which the identities are retained and are mixed in the form of solutions, suspensions, and colloids. ... Some mixtures can be separated into their components by using physical (mechanical or thermal) means.

Explanation:

5 0
3 years ago
Atoms of two adjacent elements in the third period are in the ground state. An atom of element A has only s electrons in its val
Dennis_Churaev [7]

Answer:

Explanation:

A is Magnesium, B is Aluminium both are adjacent element and lie in third period.

Magnesium with atomic number of 12 consist two s electrons in it's valence shell in ground state whereas, Aluminium which has atomic number of 13 consist three electrons in it's valence shell in the ground state out of which two are s electrons and only one p electron.

4 0
3 years ago
A barium hydroxide solution is prepared by dissolving 2.06 g of Ba(OH)2 in water to make 32.9 mL of solution. What is the concen
navik [9.2K]

Answer:  1.36 M

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.

Molarity=\frac{n\times 1000}{V_s}

where,

n = moles of solute

To calculate the moles, we use the equation:

moles of solute= \frac{\text {given mass}}{\text {molar mass}}=\frac{2.06g}{171g/mol}=0.0120moles

Molarity=\frac{0.0120\times 1000}{32.9}=0.364M

The balanced reaction between barium hydroxide and perchloric acid:

2HCIO_4+Ba(OH_)2\rightarrow BaCIO_4+2H_2O

To calculate the concentration of acid, we use the equation given by neutralization reaction:

n_1M_1V_1=n_2M_2V_2

where,

n_1,M_1\text{ and }V_1 are the n-factor, molarity and volume of acid which is HClO_4

n_2,M_2\text{ and }V_2 are the n-factor, molarity and volume of base which is Ba(OH)_2

We are given:

n_1=1\\M_1=?\\V_1=8.50mL\\n_2=2\\M_2=0.364M\\V_2=15.9mL

Putting values in above equation, we get:

1\times M_1\times 8.50=2\times 0.364\times 15.9\\\\M_1=1.36M

Thus the concentration of the acid is 1.36 M

4 0
3 years ago
What is the average deer per month
Nuetrik [128]

Answer:

25

Explanation:

explain no need it is perfect

8 0
2 years ago
Read 2 more answers
If the concentration of nucleophile increases does the reaction go faster
Kay [80]
Depends on the situation. If the nucleophile is already in excess, then no the reaction will not occur faster 

4 0
3 years ago
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