Which of the following is correct?
(a) Curved arrows are always drawn from an electron poor center to an electron
rich center.
(b) A doubled headed arrow means one electron has been moved.
(c) Curved arrows are always drawn from an electron rich center to an electron
poor center.
(d) A single headed arrow means two electrons have been moved

1 Answer

Answer :

Curved arrows are always drawn from an electron rich center to an electron
poor center.

Related questions

Description : Select the correct statement. (A) Activity arrows in a CPM network are drawn to scale (B) The tail of an arrow represents the finish of an activity (C) Arrow bead represents the start of an activity (D) None of the above

Last Answer : (D) None of the above

Description : Pick up the incorrect statement from the following: (A) An activity of a project is denoted by an arrow on the net work (B) The tail of the arrow indicates the start of the activity (C) The head of the arrow indicates the end of the activity (D) The arrows are drawn to scale from left to right

Last Answer : (D) The arrows are drawn to scale from left to right

Description : Curved arrows are used in Organic Chemistry to show the moment of electrons in the mechanism of a reaction . The correct product of the following rect

Last Answer : Curved arrows are used in Organic Chemistry to show the moment of electrons in the mechanism of a reaction . ... of the following rection is B. C. D.

Description : What does a “curved” arrow represent? (a) that two structures are resonance structures (b) the movement of two electrons (c) a link between reactants and products (d) that two structures are equivalent

Last Answer : the movement of two electrons

Description : If you took an armour piercing bullet, and repurposed it as an arrowhead, how effective would that arrow be at armour penetration, compared to historical arrows with armour piercing arrow heads?

Last Answer : So the question is whether a bullet can be designed to travel at the velocity of an arrow and achieve the same or better penetrating power? I would think not, and the reason is that with ... bullet shells for arrowheads on shafts would augment the penetrating power of the arrow, I would think not.

Description : The arrow drawn through the component shown in the illustration means that the device's value _____________. EL-0015 A. is fixed and cannot be changed B. is variable between two limits C. has yet to be determined for the circuit application D. is not allowed to change during circuit operation

Last Answer : Answer: B

Description : Which of the following statements is incorrect? (a) Electrons move toward positively charged locations. (b) An electron-rich atom is called an electrophile. (c) An electrophile is electron loving. (d) A nucleophile has a a pair of electrons it can share

Last Answer : An electron-rich atom is called an electrophile.

Description : Is the curved arrow on the Amazon logo supposed to be a smile?

Last Answer : I think it’s a graphic that they made to remind people of a smile.

Description : A spherical ball is divided into two equal halves. If the curved surface area of each half is 56.57 cm?, find the volume of the spherical ball.11531/cylinder-radius-halved-and-height-doubled-then-find-volume-with-respect-original-volume -Maths 9th

Last Answer : since curved surface of half of the spherical ball = 56.57 cm2 ∴ 2πr2 = 56.57 ⇒ r2 = 56.57 / 2 × 3.14 = 9 ⇒ r = 3 cm Now, volume of spherical ball = 4 / 3 πr3 = 4 / 3 × 3.14 × 3 × 3 × 3 = 113.04 cm3

Description : A spherical ball is divided into two equal halves. If the curved surface area of each half is 56.57 cm?, find the volume of the spherical ball.11531/cylinder-radius-halved-and-height-doubled-then-find-volume-with-respect-original-volume -Maths 9th

Last Answer : since curved surface of half of the spherical ball = 56.57 cm2 ∴ 2πr2 = 56.57 ⇒ r2 = 56.57 / 2 × 3.14 = 9 ⇒ r = 3 cm Now, volume of spherical ball = 4 / 3 πr3 = 4 / 3 × 3.14 × 3 × 3 × 3 = 113.04 cm3

Description : If in a cylinder, radius is doubled and height is halved, then find its curved surface area. -Maths 9th

Last Answer : Let r and h be radius and height of the cyclinder, then C.S.A. = 2πrh Now, radius is doubled and height is halved. ∴ New radius = 2r and new height = h / 2 New C.S.A. = 2π × 2r × h / 2 = 2πrh .

Description : If in a cylinder, radius is doubled and height is halved, then find its curved surface area. -Maths 9th

Last Answer : Let r and h be radius and height of the cyclinder, then C.S.A. = 2πrh Now, radius is doubled and height is halved. ∴ New radius = 2r and new height = h / 2 New C.S.A. = 2π × 2r × h / 2 = 2πrh .

Description : In a cylinder, radius is doubled and height is halved, then curved surface area will be -Maths 9th

Last Answer : The curved surface area will remain same. So, there is no change in the curved surface area of cylinder . Hence the curved surface area will remain same.

Description : In a cylinder, radius is doubled and height is halved, then curved surface area will be -Maths 9th

Last Answer : The curved surface area will remain same. So, there is no change in the curved surface area of cylinder . Hence the curved surface area will remain same.

Description : The arrow drawn through the resistor shown in the illustration indicates that it is _____________. EL-0086 A. for use in low power applications B. a carbon composition type C. a wire-wound type D. one whose resistance is variable

Last Answer : Answer: D

Description : a direct arrow is drawn from the process to the resource rectangle to represent each pending resource request: a. TS b. SP Cc. CCR d. RAG

Last Answer : d. RAG

Description : (2) experience collision less frequently Explanation: When an electric field is applied, both the valence electrons and the free electrons move in the same direction. The hole direction is opposite to that ... to free electrons. This means mobility is also less for a hole compared to free electron.

Last Answer : Carbon dioxide is called a greenhouse gas because - (1) its concentration remains always higher than other gases (2) it is used in photosynthesis (3) it absorbs infrared radiation (4) it emits visible radiation

Description : When a product is moved to a new location on the Perceptual Map, the Perceived Age (or Age) is: a. not affected. b. doubled. c. divided in half. d. tripled. e. other.

Last Answer : c. divided in half.

Description : Mixed Economy means : (1) Promoting both agriculture and industries in the economy (2) Co-existence of public and private sectors (3) Co-existence of rich and poor (4) Co-existence of small and large industries

Last Answer : (2) Co-existence of public and private sectors Explanation: A mixed economy is variously defined as an economic system consisting of a mixture of either markets and economic planning, public ... economies are mixed where the means of production are shared between the private and public sectors.

Description : Mixed Economy means : (1) Promoting both agriculture and industries in the economy (2) Co-existence of public and private sectors (3) Co-existence of rich and poor (4) Co-existence of small and large industries 

Last Answer :  Co-existence of public and private sectors

Description : Why is electron flow with the arrow in the symbol of a Zener diode instead of against the arrow as it is in a normal diode?

Last Answer : Because Zener diodes are operated in the reverse bias mode.

Description : The arrow direction in the diode symbol indicates a. Direction of electron flow. b. Direction of hole flow (Direction of conventional current) c. Opposite to the direction of hole flow d. None of the above

Last Answer : b. Direction of hole flow (Direction of conventional current)

Description : Different parts of a weld symbol are (i) Arrow, center line and back part (ii) Arrow, body line and length (iii) Arrow, body line and tail (iv)None

Last Answer : (iii) Arrow, body line and tail

Description : Will poor people always be poor and have less opportunities than rich people?

Last Answer : answer:One could make the argument that poor people have far MORE opportunities to succeed. They start so much further down the economic ladder that they can take advantage of all sorts of paths to ... so the number open to them is somewhat smaller. It seems counter-intuitive, but it is logical.

Description : In reference to the schematic symbol for a diode, do electrons flow toward or away from the arrow?

Last Answer : Toward the arrow.

Description : Which of the following statements is correct regarding nucleophiles? (a) They have an overall positive charge (b) They have a lone-pair of electrons (c) They have an unpaired electron (d) They have empty orbitals

Last Answer : (b) They have a lone-pair of electrons

Description : Which one of the following statements concerning elements in the Periodic Table is correct? A Elements of the same group all have the same number of electrons in the outermost occupied electron shell. B ... (Group 17) are all gases at room temperature. E The Group 13 elements are all metals.

Last Answer : D) Are compounds that exhibit both metallic & non-metallic properties to some extent and are exemplified by elements like germanium, silicon & boron

Description : When an electron is moving horizontally between oppositely charged plates, it will move in the A. straight line B. fall directly downwards C. move towards positive plates D. curved path

Last Answer : curved path

Description : What element in the magnetron causes the curved path of electron flow?

Last Answer : The permanent magnet.

Description : Assertion : In a radioactive disintegration, an electron is emitted by the nucleus. Reason : Electrons are always present inside the nucleus.

Last Answer : Assertion : In a radioactive disintegration, an electron is emitted by the nucleus. Reason : Electrons are ... both (A) and (R ) are incorrect.

Description : Which one of the following statements is WRONG? (A) A singlet or triplet state may result when one of the electrons from the HOMO is excited to higher energy levels (B) In an ... the electron from the singlet excited state returns to ground state, the molecule always shows fluorescence phenomenon

Last Answer : (C) Triplet excited state is more stable than the singlet excited state

Description : An electron moving with a velocity of 5 10 3 m / s enters into a uniform electric field and acquires a uniform acceleration of 10 3 m / s 2 in the direction of initial velocity. i. ... which electron velocity will be doubled.? ii. How much distance electron would cover in this time.? -Science

Last Answer : Given u=5×103m/su=5×103m/s , a=103m/s2a=103m/s2, v=2u=104v=2u=104 m/s i.Using v=u+atv=u+at 104=5×103+103t104=5×103+103t or t=5 sec ii. Using s=ut+12at2s=ut+12at2 s=5×103×5+12×103×52s=5×103×5+12×103×52 =37.5×103m=37.5×103m

Description : When distance from center is doubled then electric field strength will A. decrease by the factor of four B. increase by factor of four C. will be same D. decrease by factor of two

Last Answer :  decrease by the factor of four

Description : The drift speed of electrons in copper wire of diameter and length `l` is `v` . If the potential difference across the wire is doubled, then the new d

Last Answer : The drift speed of electrons in copper wire of diameter and length `l` is `v` . If the potential ... `2upsilon` C. `3upsilon` D. `upsilon//2`

Description : Identify the idea depicted in the cartoon: a. Equal distribution of income and wealth in the world. b. disparities of income and wealth between the rich and poor in the world c. The rich have access to scarce resources d. The poor have access to more resources because they are needy Correct

Last Answer : b. disparities of income and wealth between the rich and poor in the world

Description : Which of the following are true in respect of alluvial soil ? 1. Generally confined to river basins 2. It has been deposited by rivers 3. It is rich in phosphorus and poor in potash 4. It is the most fertile soil (a) I and II (b) III and IV (c) I, II and IV (d) I, II and III

Last Answer : Ans: (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 : A micro-interaction has been designed for a menu' icon. On clicking this icon, it changes into a different icon representing back', depicted by an arrow. On another click it changes back to the menu icon. Shown below are 13 key-frames of ... 4, 13 D. 1, 4, 9, 3, 5, 6, 8, 12, 2, 10, 11, 7, 13

Last Answer : C

Description : From a 3-dimensional structure made of cubes, eight rows of cubes have been removed as shown below. Select the correct pattern that will emerge from the side shown with an arrow. 

Last Answer : A

Description : What term is used for the ability of a spot on a CRT screen to continue to glow after the electron bean has struck it and moved away?

Last Answer : Persistence.

Description : An electron is moved through a potential difference of 1 volt. How much energy in joules was used to move the electron? 

Last Answer : ANSWER: 1.6 x 10-19 JOULES

Description : Pick up the correct statement from the following: (A) With both handles in his left hand, the chain man throws out the chain with his right hand and the second chain man assists him to free it from ... the two chain men meet and the ten arrows are handed over to the leader (D) All the above

Last Answer : (D) All the above

Description : For those who have seen "A Single Man," can you ID the little black-headed terriers for me?

Last Answer : Fox terriers. What a beautiful movie that was.

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 : Explain why the water molecule has a bent shape and a bond angle less than 109.5° The electron repulsion between the two lone pairs of electrons on the oxygen of water causes the O–H bonds to squeeze close together

Last Answer : The electron repulsion between the two lone pairs of electrons on the oxygen of water causes the O–H bonds to squeeze close together

Description : (a) Write electron dot diagram for chlorine (At No. 17) and calcium (At No. 20). Show the formation of calcium chloride by transfer of electrons. (b) Identify the nature of above compound’and explain three physical properties of such compound. -Chemistry

Last Answer : (b) It is ionic compound. Physical properties 1.It is hard and solid. 2.It has high melting and boiling point. 3.It soluble in water.

Description : (3) the number of electrons orbiting around the nucleus Explanation: The chemical behavior of an atom is determined by the number of electrons on its outer shell. As for the chemical bonding properties of ... , and in what ratio atoms will bond to form the 20,000,000 different substances on Earth.

Last Answer : Methyl phenyl ether can be obtained by reacting - (1) phenolate ions and methyl iodide (2) methoxide ions and bromobenzene (3) methanol and phenol (4) bromobenzene and methyl bromide

Description : From the elements: Cl, Br, F, O, Al, C, Li, Cs and Xe; choose the following: (a) The element with highest negative electron gain enthalpy. (b) The element with lowest ionization enthalpy. ( ... . (f)The element which belongs to zero group. (g) The elements which forms largest number of compounds.

Last Answer : Ans. (a). The element chlorine (Cl) has the highest negative electron gain enthalpy. (b). The element cesium (Cs) has lowest ionization enthalpy. (c). The element fluorine F has lowest atomic radius. (d ... zero group (or group 18). (g). The element carbon (C) forms the largest number of compounds.

Description : Phenol is an ortho-para director because the hydroxyl group : (a) donates electrons that increase electron density at ortho and para positions favoring nucleophilic attack. (b) donates ... para positions and attracts electrons away from meta positions favoring electrophilic attack on the ring.

Last Answer : donates electrons that increase electron density at ortho and para positions favoring electrophilic attack.