Bahar Z.

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Inorganic Chemistry

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Question:

Indicate whether the reaction below is spontaneous at room temrature: H2O2(l) → H2O(l) + 1/2 O2(g) ΔH = -98.2 kJ

Bahar Z.

Answer:

A reaction is spontaneous when ΔG is negative. The equation for ΔG is: ΔG= ΔH-TΔS Where ΔH is the change in enthalpy and ΔS is the change in entropy. The change in Nethaloy is negative as indicated. The change in the entropy is positive since it has resulted in a Gas state, which has higher entropy than a Liquid state. Therefore: ΔG= negative number - T(positive number) --> ΔG is negative --> Spontanous

Biology

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Question:

If the sequence of a gene is AATGCTGG, what is the sequence of its mRNA?

Bahar Z.

Answer:

The sequence of a gene and its mRNA have complementary bases. A (Adenine) pairs with T (Thymine), and G (Guanine) Pairs with C (Cytosine) Therefore, the sequence of the mRNA will be: TTACGACC

Algebra

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Question:

If -2x= 6y-10 and y= 3x-5 What is x and y?

Bahar Z.

Answer:

6y=(-2x)+ 10 y= 3x-5 Multiply the second equation by (-6) --> 6y= -2x+10 -6y= -18x+30 If you add the equations together you will see that 6y and (-6y) cancel out. --> 0= -20x+40 --> 20x= 40 --> x=2 Substitute 2 for x in the second equation to get y: y= 3(2)+5 --> y=11

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