define Displacement
Answers
Answer: Displacement is the minimum distance travelled by a body in a unit time. It can be zero. For example, when a body moves from Delhi to Lucknow and then returns back to Delhi, the displacement is zero in this case since the body returns back to the same position from where it moved earlier. The SI unit of displacement is metre(m).
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Answer:
Displacement (geometry), is the difference between the final and initial position of a point trajectory (for instance, the center of mass of a moving object). The actual path covered to reach the final position is irrelevant. It can simply be defined as the length of the shortest path between the final point and initial point of a body or "shortest distance between two points". Particle displacement, a measurement of distance of the movement of a particle in a medium as it transmits a wave (represented in mathematics by the lower-case Greek letter ξ) Displacement field (mechanics), an assignment of displacement vectors for all points in a body that is displaced from one state to another Electric displacement field, as appears in Maxwell's equations Wien's displacement law, a relation concerning the spectral distribution of blackbody radiation Angular displacement, a change in orientation of a rigid body, the amount of rotation about a fixed axis.A single-displacement reaction, is a chemical reaction in which one (or more) element(s) replaces an/other element(s) in a compound. It can be represented generically as:
A + B-C → A-C + B
This will most often occur if A is more reactive than B, thus giving a more stable product. A and B must be either: Different metals (hydrogen's behavior as a cation renders it as a metal here), in which case C represents an anion; or Halogens, in which case C represents a cation. In either case, when AC and BC are aqueous compounds (which is usually the case), C is a spectator ion. In the activity or reactivity series, the metals with the highest propensity to donate their electrons to react are listed first, and the most unreactive metals are listed last. Therefore, a metal higher on the list is able to displace anything on the list below it.[1] The order of activity for metals, from most reactive to least reactive, is: Li, K, Sr, Na, Ca, Mg, Al, Zn, Cr, Fe, Cd, Co, Ni, Sn, Pb, H, Sb, As, Bi, Cu, Hg, Ag, Pd, Pt, and Au. Similarly, the halogens with the highest propensity to acquire electrons are the most reactive. The activity series for halogens, from highest to lowest, is: F, Cl, Br, and I.[2] Due to the free state nature of A and B, all single displacement reactions are also oxidation-reduction reactions, where the key event is the movement of electrons from one reactant to another.[3] When A and B are metals, A is always oxidized and B is always reduced. Since halogens prefer to gain electrons, A is reduced (from 0 to −1) and B is oxidized (from −1 to 0) when A and B represent those elements. A and B may have different charge as ions and therefore some balancing of the equation may be necessary. For example, the reaction between silver nitrate, AgNO3 (which contains an Ag+ ion), and zinc, Zn, forms silver, Ag, and zinc nitrate, Zn(NO3)2 (which contains a Zn2+ ion).
2AgNO 3 (aq) + Zn (s) → 2Ag
(s) + Zn(NO 3) 2 (aq)
All simple metal with acid reactions are single displacement reactions. For example, the reaction between magnesium, Mg, and hydrochloric acid, HCl, forms magnesium chloride, MgCl2, and hydrogen, H2.
Mg (s) + 2 HCl (aq) → H
2 (g) + MgCl 2 (aq)