What is the difference between k and rate?

Summary. A rate law is an expression showing the relationship of the reaction rate to the concentrations of each reactant. The specific rate constant (k) is the proportionality constant relating the rate of the reaction to the concentrations of reactants.

chem.libretexts.org - 18.8: Rate Law and Specific Rate Constant - Chemistry LibreTexts

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Rate Law and Specific Rate Constant

Consider a simple chemical reaction in which reactant (ce{A}) is converted into product (ce{B}), according to the equation below.

[ce{A} ightarrow ce{B}

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The rate of reaction is given by the change in concentration of (ce{A}) as a function of time. The rate of disappearance of (ce{A}) is also proportional to the concentration of (ce{A}).

[-frac{Delta left[ ce{A} ight]}{Delta t} propto left[ ce{A} ight]

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Since the rate of a reaction generally depends upon collision frequency, it stands to reason that as the concentration of (ce{A}) increases, the rate of reaction increases. Likewise, as the concentration of (ce{A}) decreases, the rate of reaction decreases. The expression for the rate of the reaction can be shown as follows: [ ext{rate} = -frac{Delta left[ ce{A} ight]}{Delta t} : : : ext{or} : : : ext{rate} = k left[ ce{A} ight]

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The proportionality between the rate and (left[ ce{A} ight]) becomes an equal sign by the insertion of a constant (left( k ight)). A rate law is an expression showing the relationship of the reaction rate to the concentrations of each reactant. The specific rate constant (left( k ight)) is the proportionality constant relating the rate of the reaction to the concentrations of reactants. The rate law and the specific rate constant for any chemical reaction must be determined experimentally. The value of the rate constant is temperature dependent. A large value of the rate constant means that the reaction is relatively fast, while a small value of the rate constant means that the reaction is relatively slow.

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What does 60i mean?

sony-asia.com - What do 60i(50i) and 60p(50p) in the recording format ... - Sony Asia

For NTSC region:

AVCHD 60i is the process of recording 60 frames per second using the interlace scanning system while 60p records 60 frames per second using the progressive scanning system. When AVCHD 28M (PS) is set, movies are recorded in 60p. Otherwise, they are recorded in 60i. The interlace scanning system displays even-numbered and odd-numbered scanning lines alternately. The progressive scanning system displays even-numbered and odd-numbered scanning lines on the entire video frame at the same time, thus it has double the information per unit time compared with the interlace scanning system.

For PAL region:

AVCHD 50i is the process of recording 50 frames per second using the interlace scanning system while 50p records 50 frames per second using the progressive scanning system. When AVCHD 28M (PS) is set, movies are recorded in 50p. Otherwise, they are recorded in 50i. The interlace scanning system displays even-numbered and odd-numbered scanning lines alternately. The progressive scanning system displays even-numbered and odd-numbered scanning lines on the entire video frame at the same time, thus it has double the information per unit time compared with the interlace scanning system.

[1] Interlace Scanning

[2] Progressive Scanning

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