Which of the Following Is a Homogeneous Mixture? Sand and Water Soil Salt Water Beef Stew

2.2 Mixtures (ESAW)

Nosotros run across mixtures all the fourth dimension in our everyday lives. A stew, for case, is a mixture of dissimilar foods such as meat and vegetables; sea water is a mixture of water, salt and other substances, and air is a mixture of gases such as carbon dioxide, oxygen and nitrogen.

Mixture

A mixture is a combination of two or more substances, where these substances are not bonded (or joined) to each other and no chemical reaction occurs betwixt the substances.

In a mixture, the substances that brand up the mixture:

• are not in a fixed ratio

  Imagine, for case, that you accept \(\text{250}\) \(\text{mL}\) of water and you add sand to the h2o. It doesn't affair whether yous add \(\text{20}\) \(\text{thou}\), \(\text{40}\) \(\text{g}\), \(\text{100}\) \(\text{g}\) or whatever other mass of sand to the h2o; it will still be called a mixture of sand and water.

• keep their physical backdrop

  In the instance we used of sand and water, neither of these substances has inverse in whatsoever way when they are mixed together. The sand is still sand and the water is still h2o.

• can be separated past mechanical means

  To separate something by "mechanical means", means that in that location is no chemic process involved. In our sand and water case, it is possible to divide the mixture by but pouring the water through a filter. Something physical is done to the mixture, rather than something chemical.

Nosotros can group mixtures further by dividing them into those that are heterogeneous and those that are homogeneous.

Heterogeneous mixtures (ESAX)

A heterogeneous mixture does not have a definite composition. Cereal in milk is an example of a heterogeneous mixture. Soil is another example. Soil has pebbles, constitute matter and sand in it. Although you may add together one substance to the other, they will stay separate in the mixture. We say that these heterogeneous mixtures are non-uniform, in other words they are non exactly the same throughout.

Cereal

Figure ii.2: A submicroscopic representation of a heterogeneous mixture. The gray circles are one substance (e.yard. one cereal) and the white circles are another substance (e.g. some other cereal). The background is the milk.

Heterogeneous mixture

A heterogeneous mixture is one that consists of two or more than substances. It is non-compatible and the different components of the mixture can exist seen.

Heterogeneous mixtures tin be farther subdivided according to whether it is two liquids mixed, a solid and a liquid or a liquid and a gas or even a gas and a solid. These mixtures are given special names which yous can see in tabular array below.

Phases of matter	Name of mixture	Example
liquid-liquid	emulsion	oil in water
solid-liquid	intermission	dingy h2o
gas-liquid	aerosol	fizzy drinks
gas-solid	fume	smog

Table ii.1: Examples of dissimilar heterogeneous mixtures

Homogeneous mixtures (ESAY)

A homogeneous mixture has a definite composition, and specific properties. In a homogeneous mixture, the different parts cannot exist seen. A solution of common salt dissolved in h2o is an example of a homogeneous mixture. When the table salt dissolves, it spreads evenly through the h2o then that all parts of the solution are the same, and you can no longer see the table salt as being separate from the water. Call back also of coffee without milk. The air we exhale is another example of a homogeneous mixture since it is made up of different gases which are in a constant ratio, and which can't be visually distinguished from each other (i.east. you tin can't come across the different components).

Coffee

Salt dissolving in water

An alloy is a homogeneous mixture of two or more than elements, at least one of which is a metal, where the resulting cloth has metallic properties. For example steel is an alloy made up mainly from atomic number 26 with a small amount of carbon (to make information technology harder), manganese (to make it strong) and chromium (to foreclose rusting).

Homogeneous mixture

A homogeneous mixture is one that is uniform, and where the different components of the mixture cannot be seen.

Worked instance 1: Mixtures

For each of the following mixtures land whether it is a homogeneous or a heterogeneous mixture:

1. carbohydrate dissolved in h2o

2. flour and iron filings (minor pieces of iron)

Look at the definition

We offset look at the definition of a heterogeneous and homogeneous mixture.

Make up one's mind whether or non yous can see the components

1. We cannot see the sugar in the water.

2. We are able to make out the pieces of atomic number 26 in the flour.

Decide whether or not the components are mixed uniformly

1. The 2 components are mixed uniformly.

2. In this mixture there may be places where there are a lot of atomic number 26 filings and places where there is more flour, so information technology is not uniformly mixed.

Give the final answer

1. Homogeneous mixture.

2. Heterogeneous mixture.

Making mixtures

Brand mixtures of sand and water, potassium dichromate and h2o, iodine and ethanol, iodine and water. Classify these as heterogeneous or homogeneous. Requite reasons for your choice.

Brand your own mixtures past choosing any two substances from

• sand

• water

• stones

• cereal

• salt

• sugar

Try to make every bit many different mixtures as possible. Classify each mixture and give a reason for your option.

Figure ii.3: Potassium dichromate (top) and iodine (lesser)

Mixtures

Textbook Practise 2.i

Consummate the post-obit tabular array:

Substance	Non-mixture or mixture	Heterogeneous mixture	Homogeneous mixture
tap h2o
brass (an alloy of copper and zinc)
concrete
aluminium foil (tinfoil)
Coca Cola
soapy water
black tea
sugar h2o
baby milk formula

Solution not however available.

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Source: https://www.siyavula.com/read/science/grade-10/classification-of-matter/02-classification-of-matter-02

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