Description : CFC (chloro fluoro carbon) is very highly reactive in causing depletion of ozone layer in the atmosphere. Each atom of chlorine liberated from CFC is capable of decomposing __________ molecules of ozone. (A) 10 2 (B) 10 5 (C) 10 9 (D) 10 15
Last Answer : (B) 10 5
Description : Why is moist heat more versatile than dry heat? a. It More Easily Penetrates Materials. b. Water Molecules Conduct Heat Better Than Air c. It Denatures Proteins By Changing Their Structure And Chemical Bonds d. A-C Are Correct
Last Answer : d. A-C Are Correct
Description : Let's say we have a fairly massive blackhole near-by which is causing havoc with the solar system. Suppose we have the technology, can we destroy it using a stream of anti-particles (i.e. anti-matter)?
Last Answer : i personally have doubts because we would need the same mass in antiparticles as the black hole is heavy
Description : How do the western disturbances affect the crops in north India? (a) They cause heavy damage to the standing crops (b) They bring in locusts which destroy the crops (c) They are beneficial to the crops by causing winter rain (d) They help in keeping the plants warm to some extent in winter
Last Answer : Ans: (c)
Description : Give reason: Metallic articles which are exposed to air over long period of time lose their lustre.
Last Answer : Due to the formation of oxide, hydroxide and carbonate layers.
Description : Compounds of carbon having double or triple bonds between their carbon atoms are called (1) Saturated compounds (2) Unsaturated compounds (3) Reactive compounds (4) None of the above
Last Answer : (2) Unsaturated compounds Explanation: Compounds of carbon, which are linked by only single bonds between the carbon atoms are called saturated compounds. Compounds of carbon having double or triple bonds between their carbon atoms are called unsaturated compounds.
Description : The active site of an enzyme is formed by (A) R group of amino acids (B) NH2 group of amino acids (C) CO group of amino acids (D) Sulphur bonds which are exposed
Last Answer : Answer : A
Description : The active site of an enzyme is formed by a few of the enzymes: (A) R groups of the amino acids (B) Amino groups of the amino acids (C) Carboxyl group of the amino acids (D) Exposed sulfur bonds
Last Answer : Answer : C
Description : Which of the following statements correctly describes the general reactivity of alkynes? (a) An alkyne is an electron-rich molecule and therefore reacts as a nucleophile. (b) The σ bonds ... fail to undergo electrophilic addition reactions. (d) Alkynes are generally more reactive than alkenes.
Last Answer : Alkynes are generally more reactive than alkenes.
Description : True or False. The imbalance of electrons in an atom creates a movement of electrons called the electric current?
Last Answer : 1
Description : Addition of trivalent impurity to a semiconductor creates many (A) holes. (B) free electrons. (C) valance electrons. (D) bound electrons.
Last Answer : (B) free electrons.
Description : Which of the following statement(s) is/are correct? (1) Persistence is the term used to describe the duration of phosphorescence. (2) The control electrode is used to turn the electron beam on and off. (3) ... which are focussed into a narrow beam directed at the face of CRT. (4) All of the above.
Last Answer : All of the above.
Description : The loss of water of crystallization from a hydrat when exposed to air is termed: w) efflorescence (pron: eh-floor-es-ence) x) deliquescence (pron: del-i-kwes-ence) y) quiescence (pron: kwi-es-ence) z) anhydrogenation
Last Answer : ANSWER: W -- EFFLORESCENCE
Description : Is it true that reactive oxygen species (ROS) have only one electron and that causes them to be unstable and thus try to grab an electron from other molecules?
Last Answer : answer:You're close, but it's not that they have one electron. Usually they need one electron (you can have species that need more, but one is more typical). The Reactive' bit comes from the ... unpaired electron, by the way). However, 7 is the most common and tends to have the higher reactivity.
Description : The elements which lose electrons in chemical reaction are called?
Last Answer : Metals
Description : In an apocalyptic event scenario that didn't destroy any existing infrastructure, what items go up in value, what items lose value, and what items stay the same?
Last Answer : Does existing count
Description : Can food spoil in space?
Last Answer : As there is nothing to support bacterial or fungal (mold) life, I’m going to have to say no, the food will not be spoiled. But to be fair, I’m not an outerspace foodologist, the classes were simply to hard for me.
Description : Why don't refrigerated foods spoil as quickly as food at room temp?
Last Answer : That is correct most bacteria don’t multiply at lower temperature as rapidly. Specificly at temps below 40 degrees they really slow down or go dormant.
Description : What would happen if the microbes that spoil food were destroyed?
Last Answer : Need answer
Description : Among noble gases, Xe is quite reactive and form a number of fluorides and oxyfluorides. In these compounds the electrons, from 5p orbitals are excite
Last Answer : Among noble gases, Xe is quite reactive and form a number of fluorides and oxyfluorides. In these ... B. Square pyramid C. square planar D. octahedral
Last Answer : Among noble gases, Xe is quite reactive and form a number of fluorides and oxyfluorides. In these compounds ... `XeF_(2)` and tetraheddral `XeO_(3)`
Last Answer : Among noble gases, Xe is quite reactive and form a number of fluorides and oxyfluorides. In these compounds the ... ` C. `XeO_(2)F_(2)` D. Xe
Description : If a memory chip is volatile, it will- 1) Explode if exposed to high temperatures 2) Lose its Contents if current is turned off 3) Be used for data storage only 4) None Of These
Last Answer : 2) Lose its Contents if current is turned off
Description : Due to work, I have little time to please my dog. Any suggestions to "spoil" him and have it delivered at home?
Last Answer : I bought a personalized box with toys and treats. I signed up and receive every month for a very affordable price. Enter //yazing . com/deals/barkbox/jtoledo (remove spaces to access).
Description : What are molecules that have alternating single and double bonds are called?
Last Answer : These are molecules in a conjugated system.
Description : I`m 67 yrs.old and still work part time . Can i take my 401k out from my company and buy treasury bonds and not lose any of my money?
Last Answer : Most 401k plans have penalties for early withdrawal.
Description : The bonds formed by sharing of electrons between the atoms is called?
Last Answer : Covalent bond
Description : Equal sharing of electrons is called _____. a. ionic bonds b. covalent bonds bonds c. double bonds d. triple bonds
Last Answer : b. covalent bonds bonds
Description : Which of the following molecules has both `p_(pi)-p_(pi) and p_(pi)-d_(pi)` bonds
Last Answer : Which of the following molecules has both `p_(pi)-p_(pi) and p_(pi)-d_(pi)` bonds A. `XeO_(2)F_(2)` B. `SO_(2)Cl_(2)` C. `SO_(3)` D. `XeO_(3)`
Description : Assertion(A): Physical adsorption of molecules on the surface requires activation energy. Reason(R): Because the bonds of adsorbed molecules are broke
Last Answer : Assertion(A): Physical adsorption of molecules on the surface requires activation energy. Reason(R): ... D. If both Assertion & Reason are False.
Description : Which of the following compounds has the least tendency to form hydrogen bonds between molecules ?
Last Answer : Which of the following compounds has the least tendency to form hydrogen bonds between molecules ? A. `NH_(3)` B. `H_(2)NOH` C. `HF` D. `CH_(3)F`
Description : Identify the correct sequence of increasing of `pi-` bonds in the structure of the following molecules `:` `(I)H_(2)S_(2)O_(6)" "(II)H_(2)S_(2)O_(3)"
Last Answer : Identify the correct sequence of increasing of `pi-` bonds in the structure of the following molecules `:` `(I)H_(2) ... I C. II, I, III D. I, III,II
Last Answer : Identify the correct sequence of increasing of `pi-` bonds in the structure of the following molecules `:` `(I)H_(2) ... i C. ii, I, iii D. I, iii, ii
Description : Is it true both ionic and covalent bonds between molecules are very strong?
Last Answer : Both ionic and covalent bonds are between atoms.
Description : Which two molecules bonds together to form a disaccharide?
Last Answer : Two molecules of monosaccharides. It depends on thedisaccharide.
Description : Why does water form intermolecular hydrogen bonds with other molecules?
Last Answer : Feel Free to Answer
Description : When adding electric energy to water molecules can it cause the bonds between Hydrogen and oxygen to break?
Last Answer : What is the answer ?
Description : 1 molecule of palmitic acid on total oxidation to CO2 will yield molecules of ATP (as high energy bonds): (A) 129 (B) 154 (C) 83 (D) 25
Description : The hydrogen bonds between peptide linkages of a protein molecules are interfered by (A) Guanidine (B) Uric acid (C) Oxalic acid (D) Salicylic acid
Description : Diamond is hard because (a) It has strong covalent bonds (b) Discrete molecules of carbon are held by strong Vander Waal’s forces (c) It involves Van der Waal's forces (d) Covalent bonds are directional unlike ionic bonds
Last Answer : Ans:(a)
Description : Who do double bonds in rubber molecules influence there structure and reactivity.
Last Answer : Ans: Greater the number of double bound the rubber will be less reactive because of greater inter molecular forces of attraction among the monomers.
Description : Which group forms the strongest H-bonds to water molecules? (a) Alcohols (b) Ethers (c) Phenols (d) All equally strong
Last Answer : Phenols
Description : What property of low-molecular weight aldehydes and ketones accounts for the magnitude of their boiling points? (a) The ability to form strong H-bonds between their molecules. (b) The ability of ... other polar molecules. (d) The ability of the carbonyl group to attract electrophiles and form bonds.
Last Answer : The ability of the polar carbonyl group to attract other polar molecules.
Description : Why do alcohols have boiling points much higher than hydrocarbons of similar molecular weight? (a) Alcohols have greater van der Waals attraction forces. (b) Alcohol molecules have greater ... of volatilization. (d) Alcohols must overcome greater ionic forces in the process of volatilization.
Last Answer : Hydrogen bonds must be broken in the process of volatilization
Description : Stem and loop structures are A- proteins that help partially denatured enzymes to recover their native configuration B- structures in DNA caused by inverted repeats C- structures at the ends of linear eukaryotic DNA molecules D- the bonds between adjacent DNA nucleotides in the same strand
Last Answer : structures in DNA caused by inverted repeats
Description : Hydrogen bonds are formed when a hydrogen atom is shared between two ____. a. molecules c. elements b. atoms d. neutrons
Last Answer : a. molecules
Description : Which of these molecules is bound by ionic bonds? w) H2O x) CH4 y) NaCl z) C6H12O6
Last Answer : ANSWER: Y -- NaCl
Description : The chemical reactivity of noble gases involves the loss of electrons and hence it can form compounds with highly electronegative elements like F and
Last Answer : The chemical reactivity of noble gases involves the loss of electrons and hence it can form compounds with ... )d` and linear D. `sp` and linear
Last Answer : The chemical reactivity of noble gases involves the loss of electrons and hence it can form compounds with highly ... D. `sp^(3)d^(2)` & 2