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Chemistry Interview Questions & Answers - Learning Mode

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 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:
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:
Question: What is a substituted hydrocarbon?

Answer: A substituted hydrocarbon is a hydrocarbon with one or more of the hydrogen is substituted with another element, (often a halogen such as chlorine or bromine) or another group of atoms such as -OH. Examples: -

a simple hydrocarbon is methane CH4. Substitute chlorine for hydrogen to get

CH3Cl Methyl Chloride is used for cleaning. Sub. Again to get

CH2Cl2 Methylene Chloride is used as paint stripper. Sub again to get

CHCl3 Chloroform is an ancient anesthetic. Sub again Source:
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:
Question: Why chemists have not created a periodic table of compounds?

Answer: One major reason I can think of, that has not been addressed yet, is the periodicity of the elements. You can line the elements up into neat functional groups--alkali metals, transition elements, halogens and so on. This you could not do with compounds, even if you had a separate table for hydrocarbons, one for elastomers, and one for dyestuffs... Compounds also find wide use as smaller blocks of larger compounds. We call these precursors. Take toluene. It is a very toxic compound, but if you co Source:
Question: What is the full form of hcl?

Answer: The full form of HCL is hydrochloric acid or hydrogen chloride gas Source:
Question: what is organic chemistry

Answer: chemistry deals with organic molecules,and their physical and chemical properties Source:
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:
Question: What are the hydrocarbons?

Answer: Hydrocarbons are compounds made entirely out of Hydrogen and Carbon Source:
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:
Question: Is benzene a polar molecule?

Answer: No, Benzene is a non-polar compound Source:
Question: How many electrons are in benzene?

Answer: There are 30 electrons in benzene. This includes 24 carbon electrons and 6 hydrogen electrons. There are 12 electrons shared between C and H, and 18 between C and C. (6 electrons in up ring, 6 in down ring and 6 between C and C). Source:
Question: How do you solve Ideal Gas Law problems?

Answer: The Ideal Gas Law is used to relate the pressure, volume, temperature, and amount of an "ideal" gas. Although many gases are not ideal in reality, you can usually use the Ideal Gas Law anyway. Here is how you solve these problems!

The Ideal Gas Law is PV = nRT. Source:
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:
Question: Where is tin obtained?

Answer: Tin is obtained in various places tin is found mainly in the ore cassiterite, which is found in Malaysia, Bolivia, Thailand, and Nigeria. Source:
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:
Question: How many moles of HCl are present in .70 L of a .33 M HCl solution?

Answer: ► First, remember definition of M (moles), M = moles of species / L.

0.33 M = 0.33 moles HCl / L

► Then, multiple your volume by the molar concentration:

0.33 moles HCl / L x 0.70 L = 0.231 moles HCl

It is helpful to carry the units with your calculations. That way you can check that numerators and denominators cancel to give you the units of your answer. Source:
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:
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:
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:

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Latest 20 Questions
Payment of time- barred debt is: (a) Valid (b) Void (c) Illegal (d) Voidable
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