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Class-6
Subject- Science ​

Answer 1

Q-E give reasons

Ans - 1 Simple distillation (the procedure outlined below) can be used effectively to separate liquids that have at least fifty degrees difference in their boiling points. As the liquids being distilled is heated, the vapors that form will be richest in the component of the mixture that boils at the lowest temperature.

Ans -2 We can separate small stones from pulses before cooking by hand picking method.

Explanation: Handpicking is the method of separation in which the substances are separated based upon the difference in their size, appearance and shape.

Q-F Ans -1 Mixture of rice and salt: rice and salt can be separated by weaving. mixture of sand and salt: sand and salt is a mixed with water salt dissolves in water and sand can be separated by sedimentation and decantation followed by filtration. after that using evaporation common salt is separated.

Ans-2 Key takeaways

1. for for many solid dissolve in liquid water, the solubility increases with temperature.

2. the increase in kinetic energy that comes with higher temperature allows the solvent molecules to more effectively break apart the solute molecules that are held togather by inter molecules attractions.

Ans -3 the process of separating heavier and lighter components of a mixture by wind or why blowing air is called winnowing. this method is used by farmers two separate lighter husk particles from heavier seeds of grain.

Ans -4 solvent is a component which is present in higher proportion and is medium for particles to desolve or disperse. Here common salt i.e NaCI is dissolve in aqueous solution i.e. it is dissolved in water. Thus NaCI acts as solute water acts as the solvent.

Ans -5 two to separate a mixture of alcohol (ethanol) and water, you can use a process known as fractional distillation. this this technique relies on the fact that the compounds in the mixture have different boiling points.

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