1. Covalent bonds havemelting andpoints. 2. A positive ion has electrons and a negative ion has_ electrons. 3. The atomic number is the same as the number of. 4. Theelectrons are the outer electrons and are involved in_bonding. 5. The magic number of valence electrons needed by all, but two atoms is 6. In a covalent bond, electrons are. 7. The two particles located inside the nucleus are the_ and the
Classes Of Functional Groups
Organic Chemistry deals mostly with carbon and hydrogens, also called hydrocarbons, but those groups which replace hydrogen and bonds with carbon to give a characteristic nature, unique of their own, to the hydrocarbon they are attached to, are called functional groups. All the compounds belonging to a functional group undergo reactions in a similar pattern and are known to have similar physical and chemical properties.
Characteristics Of Functional Groups
In organic chemistry, we encounter a number of special substituent groups which are attached to the hydrocarbon backbone. These groups impart certain characteristics to the molecule of which it is a part of and thus, become the highlight of that particular molecule.
IUPAC Nomenclature
In Chemistry, IUPAC stands for International Union of Pure and Applied Chemistry which suggested a systematic naming approach for the organic and inorganic compounds, as in the beginning stage of nomenclature one single chemical compound was named in many ways by which lead to confusion. The need for this approach aroused as the number of chemical compounds newly discovered were increasing (approximately 32 million compounds) and the basic concept of nomenclature i.e. the trivial nomenclature and the derived system of nomenclature failed to overcome the challenge. It is an important task to name a chemical compound systematically and unambiguously which reduces lots of confusion about the newly reported compounds.
![1%1Y . A
9:A
امتحان النصف فصل. . و
Subject: Chemistry
Date : Feberuary 18 2021
Mid Term Exam (2020 - 2021)
Time :Two hours
Note: Answer all the following questions.
Q1: Fill the blanks with an appropriate word (answer five only)
1. Covalent bonds have melting and points.
2. A positive ion has_ electrons and a negative ion has_ electrons.
3. The atomic number is the same as the number of
4. The electrons are the outer electrons and are involved in bonding.
5. The magic number of valence electrons needed by all, but two atoms is_.
6. In a covalent bond, electrons are.
7. The two particles located inside the nucleus are the_ and the_.
Q2: : Which statements are true for source of requirements and which are false? If
false, please give the correct answer.
1. Both Enthalpy and Work are state functions
2. A process is endothermic when AH is Negative
3. Enthalpies of Reaction is same as heat of reaction
4. Heat capacity is the amount of energy required to raise the temperature of 1
g of a substance by 1 K.
Q3: The enthalpy of vaporization for water is:
H,OmH,00) 4Hvap = + 44.0 kl/mole
Calculate the AH for evaporating 3.00 grams of water and AH for Condensing 20
grams of water.
Q4: Calculate the enthalpy of the reactions below:
1. H;Om + CO2 (a4) H;CO3 (ag)
2. H;PO4fag) + 3OH ag) → 3H,0m + POa(ag)
3. C,Ha (g) + 302 le) → 2H,0la) + 20O2 (a)
AHP of H,CO, lgoj is -699.65 kJ/mole
Best Wishes to You..
...Dr. Mortatha
II
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