Which of the following ways can be used to measure reaction rate? a. measure the rate that a reactant is used up c. measure the side reactions b. measure the amount that a product is formed d. estimate the heat given off

Hi!

The correct option would be A.

The rate of reaction is described as the speed at which the conversion of substrate to product occurs.

There are two ways to measure the rate of a reaction:

1. Measure/Calculate the rate at which the product is formed.

2. Measure/Calculate the rate at which the reactant is used up.

These can be measured by observing a color change, the formation/clearance of a precipitate in the reaction vessel against time, or, for gaseous products, by attaching the vessel to a syringe to calculate the amount of gas produced per unit time.

A side reaction is a reaction that occurs simultaneously with the main reaction, and have rates that do not necessarily correspond to that of the main reaction; hence, Option C is incorrect.

The amount of heat given off indicates how exothermic a reaction is, and the rate cannot be calculated with this information; hence, Option D is incorrect.

The amount product formed or the does not indicate the rate at which a reaction takes place, but can go on to show how much of the reactants have been used; hence, Option B is incorrect.

Hope this helps!

pure substance: iron,copper

impure substance: water,charcoal

answer : third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol

explanation :

let us write down the given equations

equation 1 :

equation 2 :

equation 3 :

let us use hess's law to find out which 2 equations can be added to get the third equation.

let us reverse equation 2 and multiply it by 2. the new equation that we get is,

equation 4 :

let us add equation 1 & 4

the above equation is similar to equation 3 but has different value for dhrxn.

therefore third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol