Is milk souring a physical or chemical change

2 answers:

8 0

Milk souring is a chemical change because the milk is not just changing the way it looks, but its changing all its properties which makes the milk souring a chemical change! Easy stuff right?

Semmy [17]3 years ago

6 0

Souring milk would actually be a chemical change because it changed the properties alltogether. You can't change soured milk into it's original taste.

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1. A gas having the following composition is burnt under a boiler with 50% excess air.

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The composition of the stack gas are :

$CH_4$ = 0.8713

$C_3H_8$ = 0.0202

CO = 0.107

<h3 /><h3>What is a mole fraction?</h3>

The ratio of the number of moles of one component of a solution or other mixture to the total number of moles representing all of the components.

Assuming 100 g of the stack gas. Calculate the mass of each species in this sample according to their percentages.

Mass of $CH_4$ : 70% of 100 g = 70 g

Mass of $C_3H_8$ : 15% of 100 g = 15 g

Mass of CO : 15% of 100 g = 15 g

Now calculate the number of moles of each species:

Number of moles of $CH_4$ : $\frac{70 g}{16.04 g/mol}$ = 4.3 mole