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Free_Kalibri [48]
3 years ago
15

An experiment begins with crystalline salt at the bottom of an otherwise empty glass. First, students add water to the glass. Th

en they mix the solution until the salt crystals dissolve completely. Rate the entropy of the water-salt system during this process from highest entropy to lowest entropy. Group of answer choices
a. The entropy of the system shortly after mixing begins > The entropy of the system after the salt dissolves completely > The entropy of the system right after adding the water
b. The entropy of the system after the salt dissolves completely > The entropy of the system shortly after mixing begins > The entropy of the system right after adding the water
c. The entropy of the system right after adding the water > The entropy of the system shortly after mixing begins > The entropy of the system after the salt dissolves completely
d. The entropy of the system after the salt dissolves completely > The entropy of the system right after adding the water > The entropy of the system shortly after mixing begins
e. The entropy of the system shortly after mixing begins > The entropy of the system right after adding the water > The entropy of the system after the salt dissolves completely
f. The entropy of the system right after adding the water > The entropy of the system after the salt dissolves completely > The entropy of the system shortly after mixing begins
Physics
1 answer:
vfiekz [6]3 years ago
8 0

Answer:

Explanation:

When we add salt to water entropy of the system increases because some amount of energy is released as salt dissolves in the water due to the dissociation of ions.      

Therefore entropy of the system after the salt dissolves is highest among them all and the least entropy is associated when mixing begins.

Entropy is the degree of randomness and it increases when salt dissociates to Na^{+}\ and\ Cl^{-} as these ions are freer to move inside an aqueous solution compared to Previous state.

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In the mobile m1=0.42 kg and m2=0.47 kg. What must the unknown distance to the nearest tenth of a cm be if the masses are to be
LuckyWell [14K]

Complete Question

The complete question is shown on the first uploaded image

Answer:

Explanation:

From he question we are told that

    The first mass is   m_1 = 0.42kg

      The second mass is  m_2 = 0.47kg

From the question we can see that at equilibrium the moment about the point where the  string  holding the bar (where m_1 \ and \ m_2 are hanged ) is attached is zero  

   Therefore we can say that

               m_1 * 15cm  = m_2 * xcm

Making x the subject of the formula  

                x = \frac{m_1 * 15}{m_2}

                    = \frac{0.42 * 15}{0.47}

                     x = 13.4 cm

Looking at the diagram we can see that the tension T  on the string holding the bar where m_1  \  and   \ m_2 are hanged  is as a result of the masses (m_1 + m_2)

     Also at equilibrium the moment about the point where the string holding the bar (where (m_1 +m_2)  and  m_3 are hanged ) is attached is  zero

   So basically

          (m_1 + m_2 ) * 20  = m_3 * 30

          (0.42 + 0.47)  * 20 = 30 * m_3

 Making m_3 subject

          m_3 = \frac{(0.42 + 0.47) * 20 }{30 }

                m_3 = 0.59 kg

3 0
3 years ago
Consider f(x) = -4x2 + 24x + 3. Determine whether the function has a maximum or minimum value. Then find the
murzikaleks [220]

Answer:

The function has a maximum in x=3

The maximum is:

f(3) = 39

Explanation:

Find the first derivative of the function for the inflection point, then equal to zero and solve for x

f(x)' = -4*2x + 24=0

-4*2x + 24=0

8x=24

x=3

Now find the second derivative of the function and evaluate at x = 3.

If f (3) ''< 0 the function has a maximum

If f (3) '' >0 the function has a minimum

f(x)''= 8

Note that:

f(3)''= -8

the function has a maximum in x=3

The maximum is:

f(3)=-4(3)^2+24(3) + 3\\\\f(3) = 39

4 0
3 years ago
Which will ensure laboratory safety during the experiment? Check all that apply. using beaker tongs to handle the hot beaker rea
Aleks [24]

Answer: • using beaker tongs to handle the hot beaker.

• checking the beaker for chips prior to heating on the hot plate.

• Turning off the hot plate after use

Explanation:

The options that will ensure laboratory safety during the experiment will be:

• using beaker tongs to handle the hot beaker.

• checking the beaker for chips prior to heating on the hot plate.

• Turning off the hot plate after use.

We should note that the beaker tongs are simply used in the holding of the beakers that have hot liquids in them. Also, it s vital for the hot plate to be turned off after its use so as to prevent accident.

7 0
3 years ago
Read 2 more answers
A wave is a _____ that transmits energy
galben [10]

Answer is disturbance

3 0
3 years ago
Read 2 more answers
Describe how to make an electromagnet
Black_prince [1.1K]
First you get a tool and remove some of the warping from the tip.hehe. Then you neatly wrap the wires around the nail. Wrap more if you want to make it stronger. Make sure your able to fit the battery. connect the end of the wire to the positive side. Be careful.
5 0
3 years ago
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