Ex.1 Read and translate the text
Methods for Separating Mixtures
Because there is no chemical bonding in a mixture, we can separate the phases by mechanical means. In a heterogeneous mixture like a salad, we can easily pick out and separate the pieces. It is as simple as sifting through the salad and picking out all the tomatoes and radishes, for example. However, many mixtures contain particles that are too small, liquids, or too many particles to be separated manually. We must use more sophisticated methods to separate the mixture.
Filtration
Imagine you have a sandbox, but there are bits of broken glass in it. All you would need is some sort of filter. The sand particles are much smaller than the glass chips, so a mesh filter would let sand pass but stop the glass. We use Filtration in all sorts of purification methods. Some filters, like dialysis tubing, are such fine filters that water can pass through them, but dissolved glucose cannot.
Ex.2 Answer the questions
1. Why can we separate the phases by mechanical means?
2. What kind of methods must we use to separate too small particles, liquids?
3. What is smaller: sand particles or glass chips?
4. What do we use in all sorts of purification methods?
5. What fine filter do you know?
Ex.3 Translate from English into Russian or Kazakh
We can separate the phases by mechanical means.
In a heterogeneous mixture like a salad, we can easily pick out and separate the pieces. It is as simple as sifting through the salad and picking out all the tomatoes and radishes, for example.
Many mixtures contain particles that are too small, liquids, or too many particles to be separated manually. We must use more sophisticated methods to separate the mixture.
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