What is the name for a substance that alters the rate of chemical reactions, without being permanently altered itself?

What is the name for a substance that alters the rate of chemical reactions, without being permanently altered itself?
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ANSWER: CATALYST
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Promoter (A) Initiates a chemical reaction and is a catalyst by itself (B) Alters the position of equilibrium in a reversible reaction (C) Increases the number of active centres by increasing the unevenness of catalyst surface and by creating discontinuities in the crystals(D) All (A), (B) and (C)

Description : Promoter (A) Initiates a chemical reaction and is a catalyst by itself (B) Alters the position of equilibrium in a reversible reaction (C) Increases the number of active centres by increasing the unevenness of catalyst surface and by creating discontinuities in the crystals (D) All (A), (B) and (C)

Last Answer : (C) Increases the number of active centres by increasing the unevenness of catalyst surface and by creating discontinuities in the crystals

Catalyst is a substance, which __________ chemical reaction. (A) Increases the speed of a (B) Decreases the speed of a (C) Can either increase or decrease the speed of a (D) Alters the value of equilibrium constant in a reversible

Description : Catalyst is a substance, which __________ chemical reaction. (A) Increases the speed of a (B) Decreases the speed of a (C) Can either increase or decrease the speed of a (D) Alters the value of equilibrium constant in a reversible

Last Answer : (C) Can either increase or decrease the speed of a

What word means A substance that can cause something to happen faster than it might have otherwise but is not permanently changed itself?

Description : What word means A substance that can cause something to happen faster than it might have otherwise but is not permanently changed itself?

Last Answer : That is the definition of a catalyst.

(4) None of these Explanation: Catalysis is the change in rate of a chemical reaction due to the participation of a substance called a catalyst. Unlike other reagents that participate in the chemical reaction, a catalyst is not consumed by the reaction itself. A catalyst may participate in multiple chemical transformations. Catalysts that speed the reaction are called positive catalysts.

Description : (4) None of these Explanation: Catalysis is the change in rate of a chemical reaction due to the participation of a substance called a catalyst. Unlike other reagents that ... may participate in multiple chemical transformations. Catalysts that speed the reaction are called positive catalysts.

Last Answer : Table salt gets moist during rainy season because – (1) sodium chloride is hygroscopic (2) sodium chloride is deliquescent (3) sodium chloride contains some quantity of sodium iodide (4) sodium chloride contains hygroscopic impurities like magnesium chloride

_____ is that property of a substance which remains constant if no heat enters or leaves the substance, while it does work or alters its volume, but which increases or diminishes should a small amount of heat enter or leave.  a. Entrophy  b. Enthalpy  c. Specific Heat  d. None of the above

Description : _____ is that property of a substance which remains constant if no heat enters or leaves the substance, while it does work or alters its volume, but which increases or diminishes should a small amount of heat enter or leave.  a. Entrophy  b. Enthalpy  c. Specific Heat  d. None of the above

Last Answer : Entrophy

In a physical change some of the first physical properties of the substance may be altered and the chemical composite remains the same true or false?

Description : In a physical change some of the first physical properties of the substance may be altered and the chemical composite remains the same true or false?

Last Answer : The chemical composition is unchanged.

In a physical change some of the physical properties of the substance may be altered and the chemical composition?

Description : In a physical change some of the physical properties of the substance may be altered and the chemical composition?

Last Answer : In a physical change, the chemical composition of a substance is never changed.

A catalyst in a chemical reaction (A) Decreases the activation energy (B) Alters the reaction mechanism (C) Increases the frequency of collisions of reacting species (D) All (A), (B) and (C)

Description : A catalyst in a chemical reaction (A) Decreases the activation energy (B) Alters the reaction mechanism (C) Increases the frequency of collisions of reacting species (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

With regard to insulin: a. it is a 51 amino acid peptide b. it is formed by removal of C-chain from proinsulin c. it is produced by the alpha cells of the pancreas d. it alters the rate of enzyme synthesis

Description : With regard to insulin: a. it is a 51 amino acid peptide b. it is formed by removal of C-chain from proinsulin c. it is produced by the alpha cells of the pancreas d. it alters the rate of enzyme synthesis

Last Answer : it alters the rate of enzyme synthesis

Whoever, being an officer of the PO fraudulently puts any wrong official mark on a postal article or fraudulently alters, removes or causes to disappear an official mark which is on a postal article a) Punishable with imprisonment for a term which may extend to six months, or with fine which may extend to one hundred rupees, or with both. b) Punishable with imprisonment for a term which may extend to two years, or with fine or both.. c) Punishable with imprisonment for a term which may extend to two years, and shall also be punishable with fine d) None of these

Description : Whoever, being an officer of the PO fraudulently puts any wrong official mark on a postal article or fraudulently alters, removes or causes to disappear an official mark which is on a postal article a) ... which may extend to two years, and shall also be punishable with fine d) None of these

Last Answer : c) Punishable with imprisonment for a term which may extend to two years, and shall also be punishable with fine

Substances that cause a reaction to occur or proceed at a different rate without the reaction itself being affected are called - (1) Catalysts (2) Hydrocarbons (3) Oxidising agents (4) Substitutes

Description : Substances that cause a reaction to occur or proceed at a different rate without the reaction itself being affected are called - (1) Catalysts (2) Hydrocarbons (3) Oxidising agents (4) Substitutes

Last Answer : (1) Catalysts Explanation: Catalysts are substances that cause a reaction to occur or proceed at a different rate without the reaction itself being affected. Eg: hydrogenation of vegetable oils using a nickel catalyst.

The strain energy stored in a spring when subjected to greatest load without being permanently distorted, is called (A) Stiffness (B) Proof resilience (C) Proof stress (D) Proof load

Description : The strain energy stored in a spring when subjected to greatest load without being permanently  distorted, is called  (A) Stiffness  (B) Proof resilience  (C) Proof stress  (D) Proof load

Last Answer : (B) Proof resilience 

Do you think everyone has a definitive moment in their lives that forever alters them?

Description : Do you think everyone has a definitive moment in their lives that forever alters them?

Last Answer : I believe that life is made up of a lot of these moments. We are forced so many times to choose which path we will go down.

A catalyst (a) Alters the velocity of a reaction (b) Increases the velocity of a reaction (c) Decreases the velocity of a reaction (d) Starts a reaction

Description : A catalyst (a) Alters the velocity of a reaction (b) Increases the velocity of a reaction (c) Decreases the velocity of a reaction (d) Starts a reaction

Last Answer : Ans:(a)

What causes hardness in steel ? How heat treatment alters properties of steel ?

Description : What causes hardness in steel ? How heat treatment alters properties of steel ?

Last Answer : The shape and distribution of the carbides in the iron determines the hardness of the steel. Carbides can be dissolved in austenite is the basis of the heat treatment of steel. If ... range will produce the desired size and distribution of carbides in the ferrite, imparting different properties.

In 3rd generation dentin bonding agents, HEMA (Hydroxyethylmethacrylate) is 1. a hydrophilic monomer that wets the dentinal surface 2. a hydrophilic resin that forms a ”hybrid” layer by chemically reacting the intertubular dentin. 3. a hydrophilic monomer that alters collagen to promote cross linking of collagen to dentin. 4. a bifunctional molecule resin that copolymerizes to bis-GMA resins. a. 1,2 b. 1,4 c. 2,3 d. 1,3 e. 3,4

Description : In 3rd generation dentin bonding agents, HEMA (Hydroxyethylmethacrylate) is 1. a hydrophilic monomer that wets the dentinal surface 2. a hydrophilic resin that forms a hybrid layer by chemically reacting the intertubular dentin. 3. a hydrophilic ... a. 1,2 b. 1,4 c. 2,3 d. 1,3 e. 3,4

Last Answer : b. 1,4

Choose the drug which alters surface receptors on platelet membrane to inhibit aggregation, release reaction and to improve platelet survival in extracorporeal circulation: A. Dipyridamole B. Ticlopidine C. Aspirin D. Heparin

Description : Choose the drug which alters surface receptors on platelet membrane to inhibit aggregation, release reaction and to improve platelet survival in extracorporeal circulation: A. Dipyridamole B. Ticlopidine C. Aspirin D. Heparin

Last Answer : B. Ticlopidine

Phenylbutazone should be used only in patients not responding to other nonsteroidal antiinflammatory drugs (NSAIDs) because: A. It has lower antiinflammatory efficacy than other NSAIDs B. It has potential to cause agranulocytosis C. It has weak analgesic action D. It alters the protein binding and metabolism of many drugs

Description : Phenylbutazone should be used only in patients not responding to other nonsteroidal antiinflammatory drugs (NSAIDs) because: A. It has lower antiinflammatory efficacy than other NSAIDs B. It has potential ... It has weak analgesic action D. It alters the protein binding and metabolism of many drugs

Last Answer : B. It has potential to cause agranulocytosis

Kinetics is the study of: (1) The rate of chemical reaction (2) How fast the reactions go (3) The mechanisms and paths of the molecules take in joining from one reactant to products (4) All of these are correct

Description : Kinetics is the study of: (1) The rate of chemical reaction (2) How fast the reactions go (3) The mechanisms and paths of the molecules take in joining from one reactant to products (4) All of these are correct

Last Answer : (4) All of these are correct Explanation: In chemistry, the study of rates and mechanisms of chemical processes and, of the factors on which they depend, is called kinetics. is the study of ... provides a very detailed picture of which bonds are broken and formed during the course of a reaction.

Identify the INCORRECT statement below regarding chemical equilibrium. A All chemical reactions are, in principle, reversible. B Equilibrium is achieved when the forward reaction rate equals the reverse reaction rate. C Equilibrium is achieved when the concentrations of species become constant. D Equilibrium is achieved when the reaction quotient, Q, equals the equilibrium constant. E Equilibrium is achieved when reactant and product concentrations are equal.

Description : Identify the INCORRECT statement below regarding chemical equilibrium. A All chemical reactions are, in principle, reversible. B Equilibrium is achieved when the forward reaction rate equals the ... equilibrium constant. E Equilibrium is achieved when reactant and product concentrations are equal.

Last Answer : E Equilibrium is achieved when reactant and product concentrations are equal.

Which one of the following statements regarding a catalyst is not correct? A An enzyme is a catalyst that only binds certain substrates. B An enzyme is a protein that is a highly efficient catalyst for one or more chemical reactions in a living system. C Catalysts increase the rate of a reaction by altering the mechanism, thereby increasing the activation energy. D Catalysts do not alter the equilibrium constant for a chemical reaction.

Description : Which one of the following statements regarding a catalyst is not correct? A An enzyme is a catalyst that only binds certain substrates. B An enzyme is a protein that is a highly ... increasing the activation energy. D Catalysts do not alter the equilibrium constant for a chemical reaction.

Last Answer : C Catalysts increase the rate of a reaction by altering the mechanism, thereby increasing the activation energy.

Kinetics is the study of: (1) The rate of chemical reaction (2) How fast the reactions go (3) The mechanisms and paths of the molecules take in joining from one reactant to products (4) All of these are correct

Description : Kinetics is the study of: (1) The rate of chemical reaction (2) How fast the reactions go (3) The mechanisms and paths of the molecules take in joining from one reactant to products (4) All of these are correct

Last Answer : All of these are correct

Due to which of the following factors the brush wear rate is altered ? (a) Speed of the machine (b) Contact pressure (c) Surface conditions of brush and commutator (d) Excessive sparking (e) All of the above

Description : Due to which of the following factors the brush wear rate is altered ? (a) Speed of the machine (b) Contact pressure (c) Surface conditions of brush and commutator (d) Excessive sparking (e) All of the above

Last Answer : Ans: E

The material which can be deformed permanently by heat and pressure is called a (1) thermoset (2) thermoplastic (3) chemical compound (4) polymer

Description : The material which can be deformed permanently by heat and pressure is called a (1) thermoset (2) thermoplastic (3) chemical compound (4) polymer

Last Answer : (1) thermoset Explanation: A thermosetting polymer, resin, or plastic, often called a thermoset, is a polymer that is irreversibly hardened by curing from a soft solid or viscous liquid prepolymer or resin.

The material which can be deformed permanently by heat and pressure is called a: (1) Thermoplastic (2) Thermoset (3) Chemical compound (4) Polymer

Description : The material which can be deformed permanently by heat and pressure is called a: (1) Thermoplastic (2) Thermoset (3) Chemical compound (4) Polymer

Last Answer : (2) Thermoset Explanation: Thermoset materials are those materials that are made by polymers joined together by chemical bonds, acquiring a highly cross linked polymer structure. They cannot melt.

A catalyst inhibitor (A) Lessens its selectivity (B) May be useful for suppressing undesirable side reactions (C) Is added in small quantity during the catalyst manufacture itself (D) All (A), (B) and (C

Description : A catalyst inhibitor (A) Lessens its selectivity (B) May be useful for suppressing undesirable side reactions (C) Is added in small quantity during the catalyst manufacture itself (D) All (A), (B) and (C

Last Answer : (D) All (A), (B) and (C

Do copyright laws protect professional photos from being altered?

Description : Do copyright laws protect professional photos from being altered?

Last Answer : Slapped a COPYRIGHT right across the picture!

The resting membrane potential of a cell a. is dependent on the permeability of the cell membrane to K+ being greater than the permeability to Na+ b. falls to zero immediately when Na+, K+ ATPase in the membrane is inhibited c. is usually equal to the equilibrium potential for K+ d. is usually equal to the equilibrium potential for Na+ e. is markedly altered if the extracellular Na+ concentration is increased

Description : The resting membrane potential of a cell a. is dependent on the permeability of the cell membrane to K+ being greater than the permeability to Na+ b. falls to zero immediately when Na+ ... the equilibrium potential for Na+ e. is markedly altered if the extracellular Na+ concentration is increased

Last Answer : is dependent on the permeability of the cell membrane to K+ being greater than the permeability to Na+

Have you ever found that you had been in an altered state without knowing it?

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Last Answer : answer:I often feel that I'm numb -not connecting with the world around me as I should. From your description of your behaviors, Marinelife, that very much sounds like my numbness. I attribute this ... numbness that I've described. I'm happy to see you feel you're moving away from numbness!

Articles of Association can be altered by passing– (A) An ordinary resolution in Annual General Meeting (B) A special resolution in Annual General Meeting (C) A resolution with special notice (D) Without any resolution

Description : Articles of Association can be altered by passing– (A) An ordinary resolution in Annual General Meeting (B) A special resolution in Annual General Meeting (C) A resolution with special notice (D) Without any resolution

Last Answer : Answer: A special resolution in Annual General Meeting

The remitter can be altered the office of payment of the payees address a) On payment of second commission b) Without any fees c) Not permissible d) Only can ask repayment to him

Description : The remitter can be altered the office of payment of the payees address a) On payment of second commission b) Without any fees c) Not permissible d) Only can ask repayment to him

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Do Chemical reactions occur at the same rate no matter what the size of the reactant particles?

Description : Do Chemical reactions occur at the same rate no matter what the size of the reactant particles?

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The rate at which the chemical reactions in the body cells take place is known as the __________ rate.?

Description : The rate at which the chemical reactions in the body cells take place is known as the __________ rate.?

Last Answer : ,.ll;

The rate at which the chemical reactions in the body cells take place is known as the __________ rate.?

Description : The rate at which the chemical reactions in the body cells take place is known as the __________ rate.?

Last Answer : ,.ll;

Arrhenius equation K = Ae-E a / R T In some reactions, Rate of reaction is directly proportional to. Concentration of catalyst Catalyst used in Bio-Chemical reactions is called. Enzymes Reactions catalyzed by light are called as. Photo catalyzed or Photosensitised reactions

Description : Arrhenius equation K = Ae-E a / R T In some reactions, Rate of reaction is directly proportional to. Concentration of catalyst Catalyst used in Bio-Chemical reactions is called. Enzymes Reactions catalyzed by light are called as. Photo catalyzed or Photosensitised reactions

Last Answer : Define order of reaction

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Description : Pick out the wrong statement. (A) In a multistep reaction, the slowest step is the rate determining step (B) In general, the rate of a reaction becomes triple for every 10°C rise in temperature (C ... energy (D) Molecularity of a reaction cannot be zero but the order of a reaction can be zero

Last Answer : (B) In general, the rate of a reaction becomes triple for every 10°C rise in temperature

Metabolism is carried out by a large class of proteins that decrease the activation energy required for chemical reactions inside a cell. Therefore they only facilitate reactions that would naturally occur at a much slower rate. What is the name of these proteins that speed up biochemical reactions?

Description : Metabolism is carried out by a large class of proteins that decrease the activation energy required for chemical reactions inside a cell. Therefore they only facilitate reactions that would naturally occur at a much slower rate. What is the name of these proteins that speed up biochemical reactions?

Last Answer : Enzymes

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Description : How to get bigger lips permanently without surgery?

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Description : What material can be permanently deformed without breaking?

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Last Answer : (d) 1, 2, 3 & 4

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Last Answer : This is the Answer:

Write balanced chemical equations for the following reactions: (a) Dilute sulphuric acid reacts with aluminium powder. (b) Dilute hydrochloric acid reacts with sodium carbonate. (c) Carbon dioxide is passed through lime water. -Chemistry

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It is dangerous to observe solar eclipse with naked eyes because – (1) Infrared radiations from sun burn our retina (2) Ultraviolet radiations from Sun burn our retina (3) All radiations from sun initiate chemical reactions in eyes (4) Cosmic rays reach eyes more during the eclipse

Description : It is dangerous to observe solar eclipse with naked eyes because – (1) Infrared radiations from sun burn our retina (2) Ultraviolet radiations from Sun burn our retina (3) All radiations from sun initiate chemical reactions in eyes (4) Cosmic rays reach eyes more during the eclipse

Last Answer : (2) Ultraviolet radiations from Sun burn our retina Explanation: The solar radiation that reaches the surface of Earth ranges from ultraviolet (UV) radiation at wavelengths longer than 290 nm to radio ... of the Sun during an eclipse is for the development of "eclipse blindness" or retinal burns.

(3) preventing rapid setting of cement Explanation: Portland cement clinker is a hydraulic material which shall consist of at least two-thirds by mass of calcium silicates, the remainder consisting of aluminium- and ironcontaining clinker phases and other compounds. The ratio of CaO to SiO2 shall not be less than 2.0. The magnesium oxide content (MgO) shall not exceed 5.0% by mass. Cement sets when mixed with water by way of a complex series of chemical reactions still only partly understood.

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(2) brown bottles stops the passage of light through it Explanation: Silver Nitrate is stored in dark bottles in a laboratory to prevent chemical reactions as it is sensitive to light. It reacts to light to produce silver metal.

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Which of the following chemical reactions does not lead to formation of a salt? w) Reaction of salts with acids. x) The reaction of base anhydrides with acid anhydrides. y) Action of water on oxides of nonmetals. z) Reaction of acid with base.

Description : Which of the following chemical reactions does not lead to formation of a salt? w) Reaction of salts with acids. x) The reaction of base anhydrides with acid anhydrides. y) Action of water on oxides of nonmetals. z) Reaction of acid with base.

Last Answer : ANSWER: Y -- ACTION OF WATER ON OXIDES OF NONMETALS. (If water reacts with oxides of nonmetals, an acid is formed.)