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CHEM120 Week 8: Exam 3 (Units 5, 6, and 7) – With 100% Correct Answers- Download To Score An A+

HEAL100 Health Care — exam and revision material · Other

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Health Care exam material, 21 pages. Originally published on StudyMerit.

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21
Academic year
2025/2026
Language
English

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CHEM 120 Week 8 Final Exam Review Course Number:CHEM120 Course Title:Introduction to General,Organic & Biological Chemistry with Lab  Well Explained Answers  Secure high grade  Best feedback (rated) document by students (Complete solutions and resources for the course exam) Downloaded by Studymerit Dotcom (samuelkaruiki40@gmail.com) lOMoARcPSD|6879242

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CHEM 120: Final Review 1. Question: Know what is the atomic number, atomic mass, protons, neutrons & electrons Atomic number – is the number of protons in the nucleus of an atom of any element Atomic mass – is expressed in amu; is the wighted average Protons – are positively charged particles in the nucleus Neutron – are neutral, have no electrical charge Electrons – are negatively charged particles in the nucleus Atomic number = number of protons Atomic number – (minus) atomic mass = neutrons 2. Question: Describe the shapes of molecules H2S, CBr4, & PCl3 H2S – bent  Number of bonded atoms: 2  Number of lone pairs: 2  Number of electron sets: 4 CBr4 – tetrahedral  Number of bonded atoms: 4  Number of lone pairs: 0  Number of electron sets: 4 PCl3 – pyramidal  Number of bonded atoms: 3 Downloaded by Studymerit Dotcom (samuelkaruiki40@gmail.com) lOMoARcPSD|6879242

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 Number of lone pairs: 1  Number of electron sets: 4 3. Question: Calculating types of bonding (ionic, covalent, nonpolar covalent) Subtract the smaller EN value from the larger EN value  0 – 0.4 = nonpolar covalent  > (greater than) 0.4 – 1.7 = polar covalent  > (greater than) 1.7 = ionic bond Ionic bonds – is a bond that forms when electrons is being transferred from one form to another form, which results in positive & negative ions Covalent bond – a bond formed when atoms share electrons Nonpolar covalent bonds – when the EN is very similar between 2 atoms Polar covalent – when the EN is different between 2 atoms 4. Question: Non – polar covalent bonds & polar covalent bonds & electron sharing Bonding electron pair – the shared pair of electrons in covalent bonds Nonbonding pairs or lone pairs – the electrons that are not shared as part of the covalent bond Nonpolar covalent bonds – when the EN is very similar between 2 atoms Polar covalent – when the EN is different between 2 atoms 5. Question: Know the structure & makeup of DNA & RNA, know what DNA replication, transcription & translation are & ribosomes role in protein synthesis. Deoxyribonucleic acid (DNA) – provides a mechanism for heredity & serves as the blueprint for all the proteins of an organism  The DNA helix is held together by hydrogen bonds between the nucleotides  Adenine (A) binds with Thymine (T) in DNA  Guanine (G) binds with Cytosine (C) in DNA & RNA  DNA complimentary base pairs: A – T; C – G  DNA is made up of genes that code for specific proteins Ribonucleic acid (RNA) – carries information needed to the protein synthesis  Adenine (A) binds with Uracil (U) in RNA  Guanine (G) binds with Cytosine (C) in DNA & RNA  RNA complimentary base pairs: A – U; C – G DNA & RNA are polymers of repeating units of nucleotides DNA Replication – is copying or duplication of DNA molecules Transcription – the transfer of the DNA gene information to RNA which is transported out of the nucleus  A segment of DNA called the template str& transfers its information to a special RNA molecule called messenger RNA  The base sequence of DNA specifies the base sequence of mRNA  In eukaryotes the mRNA is transported out of the nucleus to the ribosome Downloaded by Studymerit Dotcom (samuelkaruiki40@gmail.com) lOMoARcPSD|6879242

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