Identify the mixture of powdered chalk and
powdered table salt and suggest a technique
for separating their components.
1. homogeneous; dissolving followed by filtration and distillation
2. homogeneous; decanting
3. heterogeneous; decanting
4. homogeneous; distillation
5. heterogeneous; distillation

The correct answer is option 1.

Explanation:

The powdered chalk and the table salt both can make a homogeneous mixture in a water solution that can be separated with the help of two processes; filtration followed by the distillation.

The chalk powder dissolved in a solution of the salt and water can be separated with the help of the filter paper by the process of filtration.

The salt can be separated by the process of the distillation from the water or liquid and it remains as an extract.  

Thus, the correct answer is option 1.

the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

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answer: 20 percent

the fish culture has become a developing commercial practice in developing countries which is already prominent in developed countries of the world. the major fish protein demand is being supplemented in developing countries is   fishing to meet the needs of the growing population. therefore, in some developing nations, the percentage of animal protein from fish in the diet can be as high as 20 percent.