SCI 6 FQ Chapter 2 Lesson 4 Separating Heterogenous Mixtures

SCI 6 FQ Chapter 2 Lesson 4

Separating Heterogenous Mixtures

​Lesson 4: Separating Heterogeneous Mixtures

​Objectives

1. Describe a certain separation method

2. Explain the separation process that will be employed in a given situation

3. Develop one’s environmental intelligence and stewardship

Multiple Choice

Identify whether the images below are heterogeneous mixtures or not.

• Homogenous Mixture

• Heterogenous Mixture

Multiple Choice

Identify whether the image is a solution, a suspension,  or a colloid.

• a solution

• a suspension

• a colloid

Multiple Choice

Identify whether the image is a solution, a suspension,  or a colloid.

• a solution

• a suspension

• a colloid

Multiple Choice

Identify whether the image is a solution, a suspension,  or a colloid.

• a solution

• a suspension

• a colloid

Multiple Choice

Identify whether the image is a solution, a suspension,  or a colloid.

• a solution

• a suspension

• a colloid

Multiple Choice

Identify whether the image is a solution, a suspension,  or a colloid.

• a solution

• a suspension

• a colloid

Multiple Choice

Identify whether the image is a solution, a suspension,  or a colloid.

• a solution

• a suspension

• a colloid

​How Is Oil Separated from Water?

• ​An oil spill happens when liquid petroleum pollutes a certain body of water.

• ​Usually, the oil comes from tankers, offshore platforms, and wells.

​

​Oil forms a heterogeneousmixture with the coastal waters.

Poll

Can you separate the oil from water?

• Yes

• No 

• Maybe

​Yes we can separate oil thru Decantation

​

• ​Immiscible liquids like oil and water can be separated through decantation.

• ​​It is the process of separating immiscible liquids and solid mixtures from suspensions.

​

​In a large-scale situations such as an oil spill on a large body of water, some people use a scoop to remove oil floating on the surface, then sell it to oil processing firms while some use ships with pumps to suction out the oil.

​Assignment will posted at the end of the class

​Be diligent

in doing the given task.

​How Are Bilao and Mine-shaking Table Used to Separate Mixtures?

• ​Rice grains are separated from hulls by winnowing.

​

• ​In this process, grains are tossed in front of a fan. The wind blows off the lighter pieces of hull and dirt while the grains fall straight into the containers.

​This can also be done without fans.

• ​In the Philippines, the mixture of rice grains and hulls is placed in a bilao and then shaken and tossed.

​

• ​The lighter pieces of hulls fall more slowly than the grains, so moving the bilao after catching the grains lets the hull pieces fall to the ground.

​Gravity is also useful in separating some mixtures.

• ​In mining sites, rocks are sorted according to size and weight using a shaking inclined table.

​

• ​With some help from running water, the lighter rocks move to a different direction while the heavier rocks go on a fairly straight path.

​

​It is called Mine-shaking Table

• ​Mine-shaking table used to separate mixtures according size and weight

• ​​This technique is also used in in farms wherein harvested crops like beans, nuts, and peas need to be sorted according to weight and in recycling facilities to segregate scrap metal, bottles, plastic, and paper.

​How Are Magnets Used to Separate Mixtures?

• ​Have you experienced losing a needle, pin, or iron nail on your carpet or in your garden?

• ​You cannot just leave it that way because others may get hurt once they step on those objects.

​A magnet is a piece of iron used to pick out metallic objects. In recycling facilities, electromagnets are used to recover scrap metals.

• ​A magnet is used to pick up metals from a mixture.

​How Are Pan and Strainers Used to Separate Mixtures?

• ​Gold ore is usually extracted using panning.

• ​It is one of oldest way of looking for gold in riverbeds.

• ​In panning, gravel is scooped from the part of the riverbed where gold is most likely located into a pan with a small amount of water.

​How Are Pan and Strainers Used to Separate Mixtures?

• ​Then, the pan is gently swirled until the heavier materials sink to the bottom.

• ​The lighter materials are spilled out. The settled material is sifted for tiny pieces of gold.

​Straining and Filtering

​Another common method to separate heterogeneous mixtures is by straining.

​

​Fine sand can be rid of rocks and pebbles by passing them through fine wire mesh. Brewed leaves are separated from liquid tea using a strainer.

​Instant teas are now packed in tea bags, so the leaves can be brewed without mixing with the liquid. This process of separation is called filtering.

​Assignment will posted at the end of the class

​Be diligent

in doing the given task.