5 Written questions
5 Matching questions
- What are the general difference between an organic molecule and an inorganic molecule?
- Describe two ways that atoms may combine with other atoms.
- Explain how electrons are distributed within the electron shell of atoms.
- Identify the 4 levels of protein structure.
- Distinguish between an ion and a polar molecule.
- a Primary, Secondary, Tertiary, Quaternary
- b Ions: atom or molecule with an electrical charge.
Polar: molecule in which the electrons and protons are not distributed symmetrically.
- c Each electron shell can hold a limited # of electrons. The maximum number of electrons that each of the 1st three shells can hold for elements of atomic number 18 and under is ...1st shell ( close to the nucleus) 2 e-, second shell 8 e-, third shell 8 e-. More complex atoms may have as many as 18 e- in the 3rd shell.
- d Two atoms of hydrogen can combine with one atom of oxygen to produce a molecule of the compound water.
Atoms of the same element combine, they produce molecules of that element.
- e Organic: compounds have carbon and hydrogen.
Inorganic: all other chemicals, chemicals that does not include both carbon and hydrogen atoms.
5 Multiple choice questions
- Molecular: consists of the symbols of the elements in the molecule with numerical subscripts that indicate how many atoms of each element are present.
Structural: representation of the way atoms bond in a molecule.
- Carbohydrates: C, H, O
Lipids: C, H, O (often P)
Protein: C, H, O, N, ( often S)
Nucleic acids: C, H, O , N , P
- Atoms that have the same atomic number but different atomic weight.
- Electrolyte: substance that ionizes in a water solution
Nonelectrolyte: organic compounds that dissolve in water, usually do not release ions.
- Simple: sugars include monosaccharaides, disaccharides; straight chains or rings.
Complex: polysaccharides are built of simple carbohydrates made of many bonded glucose molecules chains of sugars, cant digest.
5 True/False questions
What is an Ion? → Atoms that have the same atomic number but different atomic weight.
Explain the difference between saturated & unsaturated fats. → Saturated: single carbon-carbon bond link all the carbon atoms; each carbon atom binds as many hydrogen atoms as possible & is thus saturated with hydrogen atoms.
Unsaturated: have one or more double bond between carbon atoms. Fatty acids with one double bond.
How does the number of protons in a water molecule compare with the number of electrons? → the nucleus of an atom.
How does the hydrogen ion concentration compare between a solution of pH 6.4 and a solution of pH 8.42. → The solution at pH 6.4 has 100 times the hydrogen ion concentration of a solution at pH 8.42.
Explain why some atoms are chemically inert. → Synthesis: when 2 or more atoms, ions, or molecules bond to form a more complex structure A+B->AB
Decomposition: bonds of a reactant molecule break to form simpler molecules, atoms, or ions AB->A+B
Exchange: parts of 2 different types of molecular trade positions as bonds are broken and new are formed AB + CD-> AD+ BC
Reversible: product or products can change back to reactant or reactants A+B<-> AB