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- Question
How does molecular shape affect polarity?
- Correct Answer
- Polarity :: The polarity of a molecule defines its other physical properties such as melting point, boiling point, surface tension, vapor pressure etc Simply, polarity occurs when the electron distribution in a molecule is asymmetric This results in a net dipole moment in the molecule One end of the molecule is charged negative while the other gets a positive charge The polarization of a molecule greatly depends on the shape of the molecule A diatomic molecule like HF mentioned above has no issue of shape The net dipole moment is only due to the uneven distribution of electrons between the two atoms However, when there are more than two atoms involved in making a bond, there are many complexities The water molecule is of bent shape Therefore, when the two pair of electrons shared by oxygen with two hydrogen atoms is pulled towards oxygen, the net dipole moment results in the direction of the oxygen atom There is no other force to cancel out the resultant dipole moment Hence, the water molecule is highly polar Ammonia molecule is of a pyramid shape and the electronegative N atom pulls the electrons towards itself The three N-H bonds are not in the same plane; hence the dipole moments created do not get canceled out This makes ammonia a polar molecule However, the dipole moments sometimes get canceled due to the shape of the molecules, making the molecule non-polar Carbon dioxide is such a molecule
- 1. Nucleus of Hydrogen atom consists of
Options- A. 2 protons only
- B. 2 neutrons only
- C. 1 proton only
- D. 1 electron only Discuss
- 2. PAS is a drug used in the treatment of
Options- A. Cancer
- B. Typhoid
- C. Malaria
- D. Tuberculosis Discuss
- 3. which of the following are chemical changes? A) Cooking of Food B) Digestion of Food C) Freezing of water D) Water is heated up
Options- A. A & B
- B. A, B & C
- C. C & D
- D. All the above Discuss
- 4. Most commonly used bleaching agent is
Options- A. Chlorine
- B. Alcohol
- C. Carbon dioxide
- D. Sodium Chloride Discuss
- 5. What is the bond order of N2+?
Options- A. 3
- B. 1.5
- C. 2.5
- D. 2 Discuss
- 6. What are the Monomers that make up Proteins?
Options- A. Amino acids
- B. Nucleotides
- C. Disaccharides
- D. Chaperones Discuss
- 7. Which of the following chemical compounds has the highest boiling point?
Options- A. Dimethyl ether (CH3OCH3)
- B. Methanol (CH3OH)
- C. Methane (CH4)
- D. None Discuss
- 8. The degree of dissociation ( ? ) of a weak electrolyte, AxBy is related to van't Hoff factor (i) by the expression: 1. ?=x+y+1i-1 2.?=x+y-1i-1 3. ?=i-1x+y+1 4. ?=i-1x+y-1
Options- A. 1 is correct
- B. 2 is correct
- C. 3 is correct
- D. 4 is correct Discuss
- 9. Which statement is NOT true about polymers?
Options- A. Polymers are large molecules composed of small monomeric units
- B. Polymes are macromolecules
- C. Polymers are complex molecules composed of random sequences of atoms
- D. All the above Discuss
- 10. Which of these relationships is true of an uncharged atom?
Options- A. The atomic mass is equal to the atomic number.
- B. The number of electrons is equal to the number of neutrons.
- C. The number of protons is equal to the number of electrons.
- D. The atomic mass is equal to the number of electrons. Discuss
Chemistry problems
Search Results
Correct Answer: 1 proton only
Explanation:
The nucleus of hydrogen consists of only a single proton.
Its parts are a single negatively-charged electron that circles a single positively-charged nucleus of the hydrogen atom.
The electron is bound to the nucleus by the Coulomb force.
Correct Answer: Tuberculosis
Explanation:
Para-amino salicylic acid (PAS) is used in the treatment of Tuberculosis.
Correct Answer: A & B
Explanation:
A) Cooking of Food ------ Chemical Change
B) Digestion of Food ----- Chemical Change
C) Freezing of water ----- Physical Change
D) Water is heated up ---- Physical Change
because here the chemical composition of the substance changes in A & B only.
Since we know that, If the chemical composition is changing then it is a chemical change and if the chemical composition is remaining the same, then it is a physical change.
Correct Answer: Chlorine
Explanation:
Chlorine is the most commonly used bleaching agent.
Bleaching agents are compounds which are used to remove color from substances such as textiles. A bleaching agent is a material that lightens or whitens a substrate through the chemical reaction. The bleaching reactions usually involve oxidative or reductive processes that degrade color systems.
Correct Answer: 2.5
Explanation:
Bond Order = 1/2[ Nb - Na]
where
Nb = Number of electrons in bonding molecular orbitals.
Na = Number of Electrons in antibonding molecular orbitals
Bond Order of N2?:
Total number of electrons: 13
Electronic Configuration= :?1s² ?*1s² ?2s² ?*2s² ? 2py² [?2pz² ?2px1 ]
Bond Order = [9-4]/2 = 5/2 = 2.5.
Correct Answer: Amino acids
Explanation:
Proteins are long chains of Amino acids. That is in brief, Amino acids are the monomers of Proteins. Amino acids are compounds which contain both an amino group and a carboxylic group. Proteins are made up of 20 essential amino acids.
Monomer means a small molecule of an organic substance i.e, building block in general.
Correct Answer: Methanol (CH3OH)
Explanation:
Chemical Compounds with stronger intermolecular forces have higher boiling points.
The order of strengths of intermolecular forces is:
London dispersion < dipole-dipole < H-bonding
Methane (CH4) ? London dispersion forces
Dimethyl ether (CH3OCH3) ? dipole-dipole attractions
Methanol (CH3OH) ? hydrogen bonding
Therefore, Methanol - CH3OH with H-Bonding have highest Boiling Point among the given chemical compounds.
Correct Answer: 4 is correct
Explanation:
Van't Hoff factor (i) =
Total Moles = =
Correct Answer: Polymers are complex molecules composed of random sequences of atoms
Explanation:
Polymers are complex molecules composed of random sequences of atoms is the only statement which is not true regarding polymers.
Correct Answer: The number of protons is equal to the number of electrons.
Explanation:
The number of protons is equal to the number of electrons. That is the number of positive charges is equal to the number of negative charges.
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