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shtirl [24]
3 years ago
8

George’s cat had a litter of seven kittens. Four of the kittens are male. Three are female. Which set of symbols correctly descr

ibes the gender of the kittens?
 
A.
XX, XX, XX, XX, XY, XY, XY


 
B.
XY, XY, XY, XY, XX, XX, XX


 
C.
Y, Y, Y, Y, X, X, X


 
D.
X, X, X, X, Y, Y, Y
Chemistry
1 answer:
swat323 years ago
5 0
B. XY Represents name male. While. XX represents female. Hope that helps
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If a reaction is exothermic and its entropy change is positive, which statement is true? If a reaction is exothermic and its ent
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Answer:

  • <em>c. The reaction is spontaneous at all temperatures.</em>

Explanation:

The spontaneity of a reaction can be determined by the thermodynamic property named Gibb's free energy or simply free energy (G).

The change in the free energy of a system is defined as the difference between the increase in enthalpy (ΔH) and the product of the temperature (T) times the increase in entropy (ΔS):

  • ΔG = ΔH - T ΔS

The sign of ΔG tells if a reaction is spontaneous according to this:

  • ΔG < 0, the reaction is spontaneous.
  • ΔG = 0, the reaction is in equilibrium.
  • ΔG > 0, the reaction is not spontaneous.

The question states that a reaction is exothermic, and its entropy change is positive. That means:

  • Exhotermic: ΔH < 0
  • Positive entropy change: ΔS > 0

Remember that the temperature is stated in absolute scale, so T is always positive.

Hence, ΔG = ΔH - T ΔS = (negative) - T (positive) = (negative) + (negative) = negative.

<u>Conclusion</u>: since ΔG is negative, regardless the temperature, you conclude that<em><u> the reaction is spontaneous at all temperatures, which is the option c.</u></em>

4 0
3 years ago
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Answer:

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Electromagnets are created using charged and insulated wire wrapped around a piece of iron. uncharged and insulated wire wrapped
Inessa [10]
I think the correct answer would be <span>charged and insulated wire wrapped around a piece of iron. The charge in the wire would make magnetic fields through the aid of the magnetic properties of iron. Hope this helps. Have a nice day.</span>
8 0
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What 6 elements in the periodic table are named after real people?
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<span>obelium (No, 102) – Alfred Nobel<span>roentgenium (Rg, 111) – Wilhelm Roentgen (formerly Ununumium)</span><span>rutherfordium (Rf, 104) – Ernest Rutherford </span><span>seaborgium (Sg, 106) – Glenn T. Seaborg</span></span>

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Answer:

the D

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