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Chemistry Interview Questions & Answers - Learning Mode
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Chemistry Interview Questions & Answers - Learning Mode

Chemistry is a branch of physical science that studies the composition, structure, properties and change of matter. Chemistry is the study of atoms, molecules and materials - their properties, composition and reactions. Chemistry has traditionally been divided into Organic and Inorganic Chemistry.

Try Chemistry Interview Questions & Answers - Exam Mode

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Chemistry Interview Questions & Answers - Learning Mode
Try Chemistry Interview Questions & Answers - Exam Mode
Question: What are KOH and HCl?

Answer: KOH is potassium hydroxide, which is a strong base. HCl is hydrochloric acid, which is a strong acid. Source: CoolInterview.com
Question: What is the difference between the law of multiple proportions and the law of definite proportions?

Answer: Both laws have to do with relating to Dalton's Atomic Theory. The only difference is that the Law of Definite Proportions deals with elements combining to form ONE compound in a simple whole number ratio. The Law of Multiple Proportions is comparing the same 2 elements that make up 2 different compounds the division of these 2 ratios should equal a simple whole number ratio.

For example, Carbon and oxygen can combine to form carbon monoxide and carbon dioxide. If you calculated each c Source: CoolInterview.com
Question: What is an oxidizing agent?

Answer: Any chemical species that has a tendency to accept electrons and thereby undergoing reduction themselves is known as an oxidizing agent Source: CoolInterview.com
Question: What is the chemical formula of detergent?

Answer: The chemical formula for detergent certainly is not "c3h8o5," as was suggested. ("c3h8o5" does not even exist as a molecule.)

Rather, the chemical formula for "detergent" really depends on what you mean by the word. By itself the word does not connoted any specific formula (must/must not have this function group).

Commercial detergents are made up of many different chemical compounds (different surfactants, colorants, pH modifiers, chlorinated and non-chlorinated whiteners, etc). F Source: CoolInterview.com
Question: What is the net charge of a non-ionized atom?

Answer: In an atom, the number of protons is equal to the number of electrons and that one proton has the same positive charge value as an electron does a negative charge value.

Therefore, I am assuming that all atoms have no charge, zero, none, squat.

Non-ionized also means the atom has not suffered electron exchange, so a non-ionized atom is really just an atom (which is word redundancy).

This is what I know from AS level Chemistry, so I don't know if it's the same thing a Source: CoolInterview.com
Question: How reactive is Trimethylindium towards oxygen and water?

Answer: Trimethylindium is extremely reactive towards oxygen and water. With low concentrations of oxygen (ppb to ppm to a few %), it immediately forms dimethylindium methoxide (Me2InOMe) as the first reaction product by insertion of O between In and C. With increased concentrations of oxygen (several %, atmospheric air or pure oxygen), it burns or explodes. Similar insertion reactions are expected with other elements of Group 16 (such as S, Se and Te) with highly vigorous outburst at higher concentrati Source: CoolInterview.com
Question: How do you extract ephedrine from a mineral block?

Answer: You cannot extract ephedrine or pseudo ephedrine from a mineral block. Anyone who tells you that they have done it is either mistaken or a liar. Source: CoolInterview.com
Question: How do you prepare a solution of 1 M HCl?

Answer: Exactly how you prepare will depend on what you are starting with. Typically, to make a 1 M HCl solution, you will be starting with a stock solution of more concentrated HCl that you will then dilute. Source: CoolInterview.com
Question: how can determine the 'pka ' of a given component

Answer: pka or pkb depends on the compound taken. when pH is measured and the concentration of compound is known, they can be determine by simple related formulas under acids & bases section which we learnt.

Other explanation may be measuring rate of ionization of acid or base with experimental setup and then calculating the negative logarithm of concentration of acidic or basic species. Source: CoolInterview.com
Question: Do all explosions produce carbon dioxide?

Answer: An explosion is nothing more than the rapid release of energy. This is most commonly due to the rapid combustion of a material, although nuclear explosions do not involve combustion. The combustion of any hydrocarbon or other carbon-containing substance ALWAYS produces carbon dioxide. This might include explosion due to a natural gas or gasoline.

It is possible, however, to explode substances that do not contain carbon, such as pure hydrogen (the very famous Hindenburg disaster in 1937 is Source: CoolInterview.com
Question: What is the octet rule in chemistry?

Answer: The octet rule is a simple chemical rule of thumb that states that atoms tend to combine in such a way that they each have eight electrons in their valence shells, giving them the same electronic configuration as a noble gas. This 8-electron configuration is especially stable because with 8 valence electrons, the s- and p-orbitals are completely filled (with 2 in the s-orbital, and 6 in the p-orbitals). Having completely filled orbitals provides increased stability due to something called "excha Source: CoolInterview.com
Question: Why acetic has less conductivity than Hcl?

Answer: Acetic acid has less conductivity, because it ionizes less in solution. HCl separates almost completely in solution to form the ions Cl- and H+. Acetic acid only partially ionizes into CH3COO- and H+ with lots of it staying as complete CH3COOH molecules. It is the concentration of ions in a solution, which determines its conductivity. An electric current passes through the solution by movement of these ions. The extent to which any partially ionized substance actually ionizes can be expressed as Source: CoolInterview.com
Question: What element was used to make the first atomic bomb?

Answer: Uranium was used in the Hiroshima bomb and Plutonium in the Nagasaki one. Source: CoolInterview.com
Question: What is a dipole moment?

Answer: Dipole moment is the measure polarity of a polar covalent bond. It is defined as the product magnitude of charge on the atoms and the distance between the two bonded atoms. Its common unit is debye and SI unit is columb meter. Source: CoolInterview.com
Question: How can you tell if there is a dipole moment or not?

Answer: A dipole moment is defined as a measure of the molecular polarity of a compound; the magnitude of the partial charges on the ends of a molecule times the distance between them (in meters).

In order for there to be a dipole moment, the element must have molecular polarity, which results from molecules with a net imbalance of charge (often a result of differences in electro negativity). If the molecule has more than two atoms, both shape and bond polarity determines the molecular polarity.< Source: CoolInterview.com
Question: What is some importance of organic chemistry?

Answer: In organic chemistry one uses it both medicinally one uses it to test for illness way back from ancient times. It is also a good diagnostic tool by smell feel or touch. You can actually heed the smell of decay in organic chemistry Source: CoolInterview.com
Question: Explain the method for the preparation of 1 normal solution of hydrochloric acid.

Answer: Dilute 85ml of HCL to 1000ml Source: CoolInterview.com
Question: Are the chemical properties of lithium a metal metalloid or a nonmetal?

Answer: Lithium, Li, is a metal. However, can also be a metalloid or a nonmetal. Source: CoolInterview.com
Question: what is organic chemistry

Answer: chemistry deals with organic molecules,and their physical and chemical properties Source: CoolInterview.com
Question: Which is polar HCl or HF?

Answer: This question is quite simple if you have an electro negativity chart:

Florine's Electronegativity: 4.0

Chlorine's Electronegativity: 3.0

Hydrogen's Electronegativity: 2.1

HCl: 3.0-2.1= .9 (Slightly polar)

HF: 4.0-2.1= 1.9 (Much more polar) Source: CoolInterview.com

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