Download Chemistry Exam Questions and Answers: Nuclear Reactions and Molecular Biology and more Exams Nursing in PDF only on Docsity!
Question 1 7 /^10 pts
CHEM 104 chemistry ii Exam 6 Portage Learning
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Due No due date Points 100 Questions 10 Time Limit 120 Minutes
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Click this link to access the Periodic Table. (https://previous.nursingabc.com/upload/images/Help_file_picture/Periodic_Table.pdf) This may be helpful throughout the exam.
- There are approximately (#) different proteins in the human body.
- The sugar which we call table sugar is called and is a member of the family of sugars called because it contains two monosaccharide molecules. Your Answer: 100, galactose disaccharides
Question 2 10 /^10 pts Click this link to access the Periodic Table. (https://previous.nursingabc.com/upload/images/Help_file_picture/Periodic_Table.pdf) This may be helpful throughout the exam.
- Fibrous proteins are in water.
- The folding of a protein chain in 3 - dimensional space is described as its structure. Your Answer: insoluable tertiary ( )
- Fibrous proteins are insoluble in water.
- The folding of a protein chain in 3 - dimensional space is described as its tertiary structure.
- There are approximately 100,000 (#) different proteins in the human body.
- The sugar which we call table sugar is called sucrose and is a member of the family of sugars called disaccharides because it contains two monosaccharide molecules.
Click this link to access the Periodic Table. (https://previous.nursingabc.com/upload/images/Help_file_picture/Periodic_Table.pdf) This may be helpful throughout the exam. What are names of the four nucleoside bases found in DNA? Your Answer: adenine guanine cytosine thymine The four nucleoside bases found in DNA are adenine, guanine, cytosine and thymine.
Define transcription and describe the 4 steps of the process. Your Answer: Transcription is the process of copying information in the strand of DNA into a new molecule of messenger RNA.
- double helix of DNA starts to unzip
- complementary ribonucleotides line up along a section of DNA
- then the ribonucleotides are joined to make the growing RNA chain
- this continues and thus results in a coded RNA strand Question 4 10 /^10 pts
Question 6 8 /^10 pts Click this link to access the Periodic Table. (https://previous.nursingabc.com/upload/images/Help_file_picture/Periodic_Table.pdf) This may be helpful throughout the exam. Balance the following reaction and label it as one of the 5 types of radioactive decay. no deductions due to rounding 3.0350 - 4.6052 = - (1.2115 x 10-^4 ) t t = - 1.5702 / - 1.2115 x 10-^4 = 12,961 yrs ln [A] - ln [A] 0 = - k t ln 20.8 - ln 100 = - (1.2115 x 10-^4 ) t = 0.693 / 5720 = 1.2115 x 10 -^4 0.693 = k t1/2 0.693 = k (5720 yrs) k A sample of wood from an ancient wheel was found to contain 20. % 14 C content as compared to a present-day sample. The t1/2 for (^14) C is 5720 yrs. Determine the decay constant for 14 C and the age of the wood.
(^81) Kr 36 +^?^ →^ (^81) Br 35
Question 8 10 /^10 pts Click this link to access the Periodic Table. (https://previous.nursingabc.com/upload/images/Help_file_picture/Periodic_Table.pdf) This may be helpful throughout the exam. Label the following nuclear reaction as fusion or fission and explain your answer. (^238) U 92 +^
14 N
7 →^
(^248) Es 99 +^4 (^1) n 0 Your Answer: this reaction is called a fussion reaction. A larger element is formed from 2 smaller elements. Reaction is fusion since a nuclide of higher mass is produced. (^238) U 92 +^
14 N
7 →^
(^248) Es 99 +^4 (^1) n 0 Click this link to access the Periodic Table. (https://previous.nursingabc.com/upload/images/Help_file_picture/Periodic_Table.pdf) This may be helpful throughout the exam. Question 9 10 /^10 pts
g/mole = 0.001479/1000= 1.479 x 10 ^(-6) kg/mole = 1.479x 10^(-6) x (3 x10^8)^2 = 1.33x10^11 J/mole (3x10^8)^ 1.3x10^11 J/mole
Question 10 10 /^10 pts
- What are the transuranium elements?
- Which of the following radiations (α, β, γ or X-ray) are the most biologically harmfully and why? Your Answer:
- Any of the synthetic (man made) elements with atomic numbers greater than that of U. These elements are created by transmutation reactions.
- rays or X-rays are the most biologiclly harmful. They travel fairly fast (at the speed of light). These rays can induce DNA alteration by interfering with the genetic material of the cell causing leukemia, lung, liver and skeletal cancers and hereditary diseases. They can also penetrate very well and through just about anything except for lead and concrete. (division by 1000 changes g to kg) E = mc^2 = (1.479 x 10 -^6 ) x (3.00 x 108 )^2 = 1.3311 x 1011 J/mol mass difference (loss) = 7.017479 - 7.01600 = 0.001479 g/mol x 1 kg/1000 g = 1.479 x 10 -^6 kg/mol sums = 7.017479 7. Masses: 7.01693 0.000549 7. (^7) Be 4 + (^0) e- 1
