# How to write a rate law for a first order reaction

To determine t, the time required for the initial concentration of a reactant to be reduced to some final value, we need to know: The initial concentration, [Ao]. And the lower case a and the lower case b represent the coefficients for our balanced equation. It makes sense if we increase the concentration of A and B, right, A and B would be closer together in space and more likely to react, therefore increasing the rate of our reaction.

And this is true for most reactions. If you increase the concentration of your reactants, you increase the rate of your reaction.

We can check this by doing some experiments. So let's say we wanna figure out what the effect of the concentration of A has on our rate of our reaction.

So we're gonna hold the concentration of B constant, so we hold the concentration of B constant in our experiments. We change the concentration of A, and we see what effect that has on the rate of our reaction.

We're going to use the initial rate of the reaction. And that's because as our reaction proceeds, the concentration of products will increase. And since reactions are reversible, if we have some products present, right, that can affect the rate of our reaction.

And that's not our goal. Our goal is to figure out what the concentration, what effect the concentration of our reactants has on our rate. And so we use the initial rate, where we have only reactants present, and no products.

So in our first experiment, let's say the concentration of A is one molar, and the rate of our reaction, the initial rate of our reaction is. And our second experiment, we increase the concentration of A to two molar.

We hold the concentration of B constant, and we observe the rate of our reaction to increase to. So we've increased the concentration of A by a factor of two. And what happened to our rate?

## Using Integrated Rate Laws

Our rate went from. So the rate increased by two as well. All right, let's compare our first experiment with our third experiment now.

We're going from a concentration of A of one, to a concentration of A of three. So we've increased the concentration of A by a factor of three. And what happened to the rate? The rate went from. So the rate increased by a factor of three. All right, to figure out the relationship, if you think to yourself, two to what power X is equal to two?

Obviously that would be two to the first. Two to the first is equal to two. All right, we could have done it for our other comparison as well. Three to what power X is equal to three?

## Law & Order (Series) - TV Tropes

Obviously three to the first is equal to three. So the rate, the rate of our reaction is proportional to, and that's what this funny symbol means here, the rate of our reaction is proportional to the concentration of A to the first power.

All right, let's do the same thing for the concentration of B. So we do some experiments where we change the concentration of B, and we see what effect that has on our initial rate. So for all of these, we're gonna hold the concentration of A constant, therefore, whatever we do to B is reflected in the rate of our reaction.

So in our first experiment, the concentration of B is one molar and the rate is. And then we change the concentration of B to two molar.

## Sciencing Video Vault

Right, we double the concentration of B while holding the concentration of A constant. And we observe the initial rate of our reaction to be. So we've increased the concentration of B, not A, and let me change that laughs.

We've increased the concentration of B by a factor of two.How soon do you want to receive your order? Please consider that it takes about 1 hour to complete 1 page of high quality text. The first law of thermodynamics is a version of the law of conservation of energy, adapted for thermodynamic nationwidesecretarial.com law of conservation of energy states that the total energy of an isolated system is constant; energy can be transformed from one form to another, but can be neither created nor destroyed.

The first law is often formulated . Published: Mon, 5 Dec Determination of the effect of enzyme concentration on catalysis using starch an amylase. INTRODUCTION. Enzymes are said to be catalytic proteins which increases the rate of a chemical reaction without being altered in the process of that reaction.

. The order of the reaction or enough information to determine it. The rate constant, k, for the reaction or enough information to determine it.

Substitute this information into the integrated rate law for a reaction with this order and solve the equation for [A o ].

Either the differential rate law (Equation ) or the integrated rate law (Equation ) can be used to determine whether a particular reaction is first order. Graphs of a first-order reaction. The expected shapes of the curves for plots of reactant concentration versus time (top) and the natural logarithm of reactant concentration versus.

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