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P4(s) + 5O2(g) ” P4O10(s) III. PCl3(g) + Cl2(g) ” PCl5(g) IV. PCl3(g) + (1/2)O2(g) ” Cl3PO(g) Calculate the value of H for the reaction below: P4O10(s) + 6PCl5(g) ” 10Cl3PO(g) __ A. __ B. __ C. __ D. __ E. –110.5 kJ –610.1 kJ –2682.2 kJ –7555.0 kJ None of these is within 5% of the correct answer. Of the product? I. 2H(g) ” H2 (g) II.

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A string under a tension of 59N is used to whirl a rock in a horizontal circle of radius 3.9 m at a speed of 23.9 m/s. The string is pulled in and the speed of the rock increases. When the string is 0.482 m long and the speed of the rock is 53 m/s, the string breaks. What is the breaking strength (in newtons) of the string

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[Hint: the path difference δ and phase difference φ are obviously related by δ/λ = φ/(2π).] A screen is illuminated by monochromatic light whose wave length is λ, as shown. The distance from the slits to the screen is L.

At the third bright fringe on the screen (position y on the screen), δ (the corresponding path length difference) and φ (the phase angle difference) is given by

1. δ = 7/2 λ and φ = 7 π

2. δ = 13/2 λ and φ = 13 π

3. δ = 9/2 λ and φ = 9 π

4. δ = 3/2 λ and φ = 3 π

6. δ = 11/2 λ and φ = 11 π

7. δ = 2 λ and φ = 4 π

8. δ = 5 λ and φ = 10 π

9. δ = 3 λ and φ = 6 π

10. δ = 6 λ and φ = 12 π

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5.236.06

(a) Calculate the position of the image.

 cm (from the lens)

(b) Calculate the magnification.

 ✕ 

Select all that correctly describe the image. (Select all that apply.)

inverted

virtual

enlarged

on the side of the lens opposite the object

real

on the same side of the lens as the object

reduced

uprigh

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An object of mass is traveling on a horizontal surface. There is a coefficient of kinetic friction between the object and the surface. The object has speed when it reaches and encounters a spring. The object compresses the spring, stops, and then recoils and travels in the opposite direction. When the object reaches on its return trip, it stops.

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The electric field strength is 2.40 x 10^4 N/C inside a parallel-plate capacitor with a 1.40 mm spacing. An electron is released from rest at the negative plate. What is the electron’s speed when it reaches the positive plate?

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Cr2 O7 2-(aq) + Cu(s)¡Cr3+(aq) + Cu2+

Consider the unbalanced redox reaction:

Balance the equation in acidic solution and determine

how much of a 0.850 M K2 Cr2 O7 solution is

required to completely dissolve 5.25 g of Cu.

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___ ___ ___

10. Provide the function for the following enzymes.

Topoisomerase

Helicase

Primase

DNA Polymerase I

DNA Polymerase III

Ligase

11. The study of changes in gene expression that occurs without alteration to genes is called

_________.

12. Noncoding regions in eukaryotic DNA are called ________. These have _______ functions

and alter gene expression.

13. Shift pairing of RNA at the third position is called ____________.

14. An operon is composed of _____.

15. In the Lac operon, if lactose is present, the operator of the lac operon is switched ____;

therefore, this is an example of a(n) ______ operon.

16. Name the 4 methods of horizontal gene transmission and how each occurs.

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1.Joints are classified based on the degree of movement they permit or on the connecting tissues that hold them together. A joint in which the two bony surfaces are united by a ligament or membrane is called

SyndesmosisGomphosis Articulation Symphysis

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Amino acids are molecules with the general structure shown below, where R can be H or various groups of bonded atoms. The 20 different R groups reflect the 20 naturally occurring amino acids. Although amino acids overall are polar, their relative polarity and relative degree of interaction with other substances is governed by the R group. 

 Amino acids bond together (like “chains”) to form proteins, which exhibit complex 3-dimensional structures resulting from various folds,   twists, and turns of the amino acid “chains”. These specific structures   occur to provide very specific functions of the protein in an organism. 

Ferritin is a protein that stores iron in its core as Fe+3 and releases the Fe as Fe+2 for use in reactions elsewhere in an organism. The iron as Fe+2 (technically in a more complicated form, but we’ll treat it as a simple ion) travels to and from the protein core via two major channels, a 3-fold and a 4-fold channel, illustrated below      

3-fold channel  4-fold channel  (substances enter through the central hole) 

The 3-fold channel is lined primarily with the amino acids aspartic acid and glutamic acid, illustrated below. The 4-fold channel is lined primarily with the amino acid leucine, also illustrated below. 

          Lines 3-fold channel Lines 3-fold channel    Lines 4-fold channel 

(a) Into which channel is Fe2+ most likely to travel? Briefly explain your answer by including the dominant interparticle force between it and the amino acid R groups that line the channel. 

(b) Into which channel is O2 most likely to travel? Briefly explain your answer by including the dominant interparticle force between it and the amino acid R groups that line the channel. 

(c) Suppose there is a region in a protein where a significant amount of H bonding occurs between R groups of amino acids. Which of the amino acids on the previous page could you expect to be present in such a region? Illustrate one possible H bonding interaction between R groups of the amino acid(s) you chose. 

How do I solve these questions?

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