Chemistry for biologists - Le site web de M. St Denis

Chemistry for biologists - Le site web de M. St Denis

Chemistry for biologists Quiz review 1. Copy the following table on your white board and complete it. For atomic mass, simply round up to the nearest whole number. Name of element Symbol Number of protons

Number of neutrons Neon Atomic mass 20 Cl 17 28

31 52 110 Answer Name of element Symbol Number of protons

Number of neutrons Atomic mass Neon Ne 10 10

20 Chlorine Cl 17 18 35

Nickel Ni 28 31 59 Chromium Cr

24 28 52 Tungsten W 74

110 184 Please name and indicate the number of subatomic particles for each of the following Radioisotopes: Radioisotop e Ca 47

Protons Neutrons Electrons Answer Radioisotop e Ca

47 Protons Neutrons Electrons 20 27

20 Please name and indicate the number of subatomic particles for each of the following Radioisotopes: Radioisotop e 14 C Protons

Neutrons Electrons Answer Radioisotop e 14 C Protons

Neutrons Electrons 6 8 6 Please name and indicate the number of subatomic particles for each of the following Radioisotopes:

Radioisotop e 60 Co Protons Neutrons Electrons

Answer Radioisotop e 60 Co Protons Neutrons Electrons

27 33 27 I 131 Please name and indicate the number of subatomic particles for each of the following Radioisotopes:

Radioisotop e 131 I Protons Neutrons Electrons

I 131 Answer Radioisotop e 131 I Protons

Neutrons Electrons 53 78 53 I

131 Please name and indicate the number of subatomic particles for each of the following Radioisotopes: Radioisotop e 67 Cu Protons

Neutrons Electrons I 131 Answer Radioisotop e 67

Cu Protons Neutrons Electrons 29 38

29 An atom has 8 protons, draw an electron shell model for this atom. How many unpaired electrons does this element have? What is the name of this element? Answer 2 unpaired electrons Draw a Lewis diagram for the following

element Element Phosphorus Lewis Diagram Answer Element Phosphorus

Lewis Diagram Draw a Lewis diagram for the following element Element Carbon Lewis Diagram Answer

Element Carbon Lewis Diagram Draw a Lewis diagram for the following Molecule Element Water

Lewis Diagram Answer Element Water Lewis Diagram 4) How do polar covalent bonds and non-polar covalent bonds differ?

Answer No significant difference in electronegativity Significant difference in electronegativity (between 0.5 and 1.7) In a bond between nitrogen and hydrogen (N

- H), which atom will the electrons closer to? Explain you reasoning. Answer The electronegativity of Nitrogen is 3.0 while the electronegativity of Hydrogen is 2.1. In other words, Nitrogen has more pull on the shared electrons and they will closer to N than H Because of this, Nitrogen becomes slightly negative and hydrogen become slightly positive

What are the main differences between ionic bonds and covalent bonds? Answer Ionic Bonding Covalent Bonding Between Metal and non-Metal

Two or more non-metals Mechanism TOTAL TRANSFER OF ELECTRONS Metal loses e CATION Non-metal Gains e ANION Valence electrons are shared (up to four shared pairs) Difference in

Electronegativity Greater than 1.7 Polar between 0.5 and 1.7 / Non-polar less than 0.5 Strength of bonds Strong Bonds Weak Bonds

Water solubility Soluble in water Insoluble in water Crystal Lattice Individual molecules. Structures vary greatly depending on how individual molecules interact with each other. Depends mostly on: polarity, size and 3D shape

Structure Water is a polar molecule. Explain how the polarity of water accounts for its lattice structure. Answer The polarity of water helps the formation of hydrogen bonds among water molecules. Hydrogen bonds creates the lattice structure of water. Potassium chloride, KBr is an ionic

compound. Describe what happens to its ions when it is dissolved in water. Answer When potassium bromide, KBr, is dissolved in water it dissociates into potassium ions, K+ , and bromine ions, Br ions. These ions are enveloped by water molecules (due to waters polarity) to form a surface coat also called hydration shell. ***Picture on next slide

Name this type of reaction Answer Hydrolysis! Notice the addition of water will break the bond, and create 2 products What are the products of this reaction? HNO3 + NaOH (Acid)

(Base) Answer HNO3 + NaOH (Acid) (Base) H2O + NaNO3 (Water )

(Salt) How do acids and bases differ in terms of how they behave when added to pure water Answer Acids when placed in aqueous solution cause the production of hydronium ions, increasing Proton (H+) concentration and lowering the pH. Bases cause the production of hydroxide ions in aqueous solution, increasing OH

concentration, and raising the pH. What is a hydrocarbon. Are these types of molecules polar? Answer Molecules consisting of only carbon atoms bonded to hydrogen atoms are called hydrocarbons. These are non-polar molecules due to the insignificant ( less than 0.5) difference in electronegativity. Non polar molecules (no charge) are considerer hydrophobic

(not strongly attracted to water) Identify the functional group in each of the molecules by circling and naming each Molecule Name Found in Answer

Molecule Name Found in Hydroxyl Alcohols and Carbohydrates Identify the functional group in each of the molecules by circling and naming each

Molecule Name Found in Answer Molecule Name

Found in Carbonyl (Aldehyde) Carbohydrates Identify the functional group in each of the molecules by circling and naming each Molecule Name

Found in Answer Molecule Name Found in Carboxyl Amino Acids and

Fatty Acids (lipids) Identify the functional group in each of the molecules by circling and naming each Molecule Name Found in Answer

Molecule Name Found in Carbonyl (Ketone) Carbohydrates Identify the functional group in each of the molecules by circling and naming each

Molecule Name Found in Answer Molecule Name Found in

Hydroxyl Alcohols and Carbohydrates Amino Amino Acids, Proteins

Recently Viewed Presentations

  • Financial Management FOR A SMALL BUSINESS Welcome 1.

    Financial Management FOR A SMALL BUSINESS Welcome 1.

    If you need to plan for a large expenditure, such as an equipment purchase or moving to a new location, a cash flow projection is the perfect tool. Similarly, if you have a seasonal business with large inventory purchases, a...
  • "The novel can deal unflinchingly with the social issues of ...

    "The novel can deal unflinchingly with the social issues of ...

    "The novel can deal unflinchingly with the social issues of the day." ... They are described as wearing expensive and lavish clothing, "velvet, silk and furs", exposing Mr Brocklehurst as a hypocrite as well as the extreme differences between social...
  • Single atom imaging and manipulation Silicon (100) surface

    Single atom imaging and manipulation Silicon (100) surface

    Atomically precise single P atom placement Using STMs to fabricate devices Single atom imaging and manipulation Atomically precise single P atom placement Using STMs to fabricate devices 350°C S.R. Schofield, N.J. Curson, M.Y. Simmons et al., Phys. Rev. Lett. 91...
  • CSCE-221 Advanced Makefile

    CSCE-221 Advanced Makefile

    CSCE-221 Hashing Strings. Emil Thomas. 04/10/19. Based on Prof. Shawn Lupoli's Notes(TAMU) Hashing with string keys. Idea is to use string-valued keys in hash table. Most real world keys would be strings. The challenge is to come up with good...
  • DISTANCE LEARNING - people.hsc.edu

    DISTANCE LEARNING - people.hsc.edu

    TEACHING ANCIENT CIV Introduction to the AV Resources for Classics website Using Photographs Using Animation Using VRML Using 3D Reconstruction Using Photographs Maecenas Dr. J's Illustrated Guide to the Classical World Dr. J's site linked by Wellesley Links to Dr....
  • The Tudors in Ireland (Part 1) - Scoilnet

    The Tudors in Ireland (Part 1) - Scoilnet

    The Tudors in Ireland (Part 1) The Fall of the Fitzgeralds of Kildare The Wars of the Roses In the fifteenth century, England was torn by a terrible civil war. Two branches of the royal family - the House of...
  • Statens vegvesen - ROADEX Network

    Statens vegvesen - ROADEX Network

    bridge. is Norway's longest suspension bridge, with a main span of 1,380 metres. (Ninth longest in the world. The longest one is the Akashi-Kaikyō Bridge, also known as the Pearl Bridge (1,991 metres)) (The photo is from the Hardanger bridge,winter...
  • Legislation - Property Litigation Association

    Legislation - Property Litigation Association

    Courts Act 2003 - s99 covers the right of the HCEO to request police support and s189 makes it an offence to obstruct an enforcement agent executing a High Court writ Health and Safety at Work Act 1974 (HASAW) Human...