in order to save time

During selection trials for the Olympic games, the qualifying time set for 100 meters sprint is 11 seconds. Nina's current speed for 100 meters dash is 16 seconds. How much time should Nina save in order to qualify? => 4 seconds or 6 seconds or 5 seconds or 7..

Time also has a wide range of values. They are tabulated below in the order of their magnitude. Event Order of magnitude of time interval (s) Time taken by light to cross distance of nuclear size [time proportion to revolve once..

Example 5: Cyclopropane (C 3 H 6 ) at room temperature has a ring structure. When it is heated, the ring opens up and cyclopropane isomerizes to propylene. The reaction takes place in a first order manner. Therefore, the rate law for the reaction is, rate (r) = k [C 3 H 6 ] 1 f..

The scatter plot shows the times taken by Rose to reach City B from City A at different speeds. How much time will be saved if Rose travels at a speed of 60 miles per min than that if she travels at 30 miles per min? => 9 minutes or 10 minutes or 13 minutes or 12 minut..

In no subject does measurement play as important a role as in science. Real science cannot exist without measurement. According to Lord Kelvin, one of the greatest scientists, unless you can measure what you are speaking about and express it in numbers you have not started 'Exact Science..

Example 4: Ammonia (NH 3 ) gas decomposes over platinum catalyst to nitrogen gas (N 2 ) and hydrogen gas (H 2 ). The chemical reaction is as follows: fig 6.4(a) - Concentration versus time profile for a zero order reacti..

Series Reactions (First Order) - A complex reaction involving two series reactions can be of the type, A reacts to give B, which is then transformed to C. Both the elementary reactions (1) and (2) exhibit first - order kinetics, that is, For this reaction, [A] = [A] o exp (-k 1 ..

For a reaction A + B C + D. The rate law for the reaction is expressed as rate = k [A] m [B] n If the concentration of B is kept large, then [B] essentially does not change over time and if the rate of reaction is determined as rate = k [A] then this reaction is a pseudo first orderh..

Graphical Method of Order Determination - First, the data of concentrations versus time is obtained by a suitable method. Then, the data is plotted as concentration versus time. From the resulting plot, the instantaneous rates are determined by drawing tangents to curv..

Alice's salary 4 years ago was $ y . Now, she gets 2 times the salary and spends $2,632. Calculate her savings. => $(2 y - 2632) or $(2632 + 2 y ) or $(2632 - 2 y ) or $(2632 - y )..