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Does larger K mean faster rate?

The rate constant, k, gives a direct measure of the relative reaction rate. A very small value for the rate constant equates to a very slow reaction in general. Equally, a large value for the rate constant means a large value for the rate and that the reaction is rapid.

ibchem.com - Kinetics: 6.32 - The rate constant - IB Chemistry
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The rate constant relates the reaction rate to the concentrations of the reaction components.

Significance of the rate constant

The rate constant, k, gives a direct measure of the relative reaction rate. A very small value for the rate constant equates to a very slow reaction in general. Equally, a large value for the rate constant means a large value for the rate and that the reaction is rapid.

Rate = k[A]x[B]y

Example: When k = 5 x 10 9 then the reaction (excluding situations where the concentrations are extremely small) is very fast. then the reaction (excluding situations where the concentrations are extremely small) is very fast. When k = 1 x 10-10 the reaction is always very slow Clearly, the actual rate is dependent on the concentrations and qualified by the orders, but it is still possible to get an idea about the relative rate of a reaction just by looking at the rate constant.

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Units of the rate constant

The units of the rate constant depend on the overall order of the reaction. As the rate equation can take different forms, i.e. the orders with respect to the individual reactants depend on the specific reaction under study, then the units for the rate constant change appropriately. To find the units you must substitute the units of all of the other parts of the equation and then cancel down. Units of rate = mol dm-3 s-1 Units of concentration = mol dm-3 When the concentration is raised to a specific order then the same thing must be done to the units of concentration. i.e.:

[A]1 has units of (mol dm-3)1 = mol dm-3

but [A]2 has units of (mol dm-3)2 = mol2 dm-6

So, the rate constant k for a first order reaction rate = k [A]1 k = rate/[A]1 therefore units of k = mol dm-3 s-1/mol dm-3 = s-1 For a second order reaction rate = k [A]2 k = rate/[A]2 therefore units of k = mol dm-3 s-1/mol2 dm-6 = dm3 mol-1 s-1 Note that the above refers to the overall order of the rate equation, not the specific individual orders. i.e the rate equation:

Rate = [A][B]

is second order overall, therefore:

Rate constant (k) units = dm3 mol-1 s-1

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Factors affecting the rate constant

The rate constant is just that, constant, unless the temperature conditions change. (Kinetics section 6.40) However, catalysts also change the rate constant, but the reaction is now a different process with a different mechanism (Kinetics section 6.43).

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How many is 1 crore?

ten million A crore (/krɔːr/; abbreviated cr) denotes ten million (10,000,000 or 107 in scientific notation) and is equal to 100 lakh in the Indian numbering system. It is written as 1,00,00,000 with the local 2,2,3 style of digit group separators (one lakh is equal to one hundred thousand, and is written as 1,00,000).

en.wikipedia.org - Crore - Wikipedia

100 lakh in the Indian numbering system (10 million)

A crore ( ; abbreviated cr) denotes ten million (10,000,000 or 107 in scientific notation) and is equal to 100 lakh in the Indian numbering system. It is written as 1,00,00,000 with the local 2,2,3 style of digit group separators (one lakh is equal to one hundred thousand, and is written as 1,00,000).[1] It is widely used both in official and other contexts in Afghanistan, Bangladesh, Bhutan, India, Myanmar, Nepal, Pakistan, and Sri Lanka. It is often used in Bangladeshi, Indian, Pakistani, and Sri Lankan English.

Money [ edit ]

Large amounts of money in Bangladesh, India, Nepal, and Pakistan are often written in terms of Koti or crore. For example (one hundred and fifty million) is written as "fifteen crore rupees", "15 crore" or "₹15 crore".[1] In the abbreviated form, usage such as "₹15 cr" (for "15 crore rupees") is common.[2] Trillions (in the short scale) of money are often written or spoken of in terms of lakh crore. For example, one trillion rupees is equivalent to:[citation needed]

One lakh crore rupees

₹ 1 lakh crore

1 lakh crore ₹ 10 5+7

10 ₹ 10 12

10 ₹ 10,00,00,00,00,000 in Indian notation

10,00,00,00,00,000 in Indian notation ₹ 1,000,000,000,000 in metric notation

The word crore derives from the Prakrit word kroḍi, which in turn comes from the Sanskrit koṭi (कोटि),[3] denoting ten million in the Indian numbering system, which has separate terms for most powers of ten from 100 up to 1019. The crore is known by various regional names.[4]

See also [ edit ]

References [ edit ]

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