Classify as homogeneous or heterogeneous.?

Question

a. a carbonated soft drink
b. gasoline
c. a solution of ethanol and water

Answer 1

A) heterogeneous
B) homogeneous
C) heterogeneous.

Homogeneous means all of one kind. Heterogeneous is a mix. Therefore if you have more than one substance in the mix it becomes heterogeneous.

Soft drinks are a mix of caramel, water, and other ingredients with carbonation added. The word mix says it all, soda is heterogeneous.

Pure gasoline is one substance, a by product of oil. The word pure says it all; the substance is homogeneous. Now you can break gasoline down into hydrocarbons by burning it. But, it still starts as pure gasoline. The chemical reaction of burning changes it, which allows the separation of the composite materials. If you don't put it under such a chemical reaction then it remains pure gasoline.

A solution of ethanol and water; well the word "and" says it all. If you have something and something else then you have a heterogeneous mixture.

According to Wikipedia: http://en.wikipedia.org/wiki/Heterogeneous
"Heterogeneous (IPA: [ˌhɛɾɚə'dʒiniəs], also [hɛɾɚo-] (American English)) means that something (an object or system) consists of a diverse range of different items. It is the antonym of homogeneous, which means that an object or system consists of many identical items."

Answer 2

Dan is close, but as usual, wikipedia is not a good reference.

Homogeneous means the same or equal throughout. You can have a mixture that is homogenous. It simply means that every sample that you take is equal. because ethanol and water are miscible, it would be homogenous.

The carbonated soft drink, some swallows have more gas in them than others, therefore, not every sample is the same. This means that this is heterogenous

Now gasoline - that's a tricky one - I would say, it depends on where you buy your gas! - I'm going to say they buy their gas at expensive well-refined stations so that one - each sample you took is homogeneous.

Other examples;

milk: milk has a lot of stuff going on in there - but what does it say on the jug - it says homogenized (there's a hint for the answer!)

vegetable soup: every bite that you take is likely going to have different things on the spoon - so it's heterogeneous.

Answer 3

I know this is very old but I don't like the answers so far.

A carbonated soft drink sitting on a shelf undisturbed and in a capped bottle is a solution as the CO2 gas, as well as the other ingredients, is evenly distributed throughout the bottle.(homogenous) When you uncap it and the bubbles begin to form then it is no longer a solution as now there are pockets of CO2 within the bottle.

Gasoline is also a mixture of different hydrocarbons that are miscible. This means that it is also a solution. All soultions are mixtures, but not all mixtures are solutions.

Ethanol and water are also miscible and thus make a solution.

Milk is a colloid. A suspension of particles that are not entirely dissolved. Not a solution.

Answer 4

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RE:
Classify as homogeneous or heterogeneous.?
a. a carbonated soft drink
b. gasoline
c. a solution of ethanol and water

Answer 5

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a) iron -- element (b) the air you breathe -- Heterogeneous mixture (c) soda pop -- homogeneous mixture (d) distilled water -- compound (b) is the hardest, because in truth the atmosphere is a heterogeneous mixture of various gases. the air you breath is most likely a homogeneous mixture locally, but this will change on a regular basis. it will depend on the definition of "the air we breath" and how much volume is considered.

Answer 6

^^ She's right. Also, by it's definition, a solution is homogeneous.