Engineering MOSAIC. Мантатова С.С - 26 стр.

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UNIT XX
Moving molecules
Before you start
1. Answer the following questions:
1. If you put a cup of ice cream under the sun, what happens? Why?
2. If you put a glass of water in the freezer, what happens? Why?
3. Why do we put ice in our drinks in the summer?
4. Why does butter melt on toasted bread?
Reading
2. Read the text and decide if the sentences (1-10) below are true (T)
or false (F):
1. Heat spreads from cold things to warm things.
2. Bread doesn't have any molecules because it is solid.
3. When you toast bread, the molecules in it move faster.
4. The molecules in cold butter are not moving.
5. Molecules in ice cubes move faster than those in fruit juice.
6. Before butter becomes soft and warm, the molecules in the butter
don't move.
7. Heat causes things to melt.
8. Cold things move slowly.
9. Heat is a type of molecule.
10. When you put ice in fruit juice, the molecules in the juice move
faster.
Did you put butter on your toast at breakfast this morning? If
you did, you must have noticed that the butter didn't stay cold for
very long. Heat from the toast passed into the butter and caused it to
melt.
Heat is a type of energy, and it spreads from warm things to
cold things. Moving molecules pass the heat along. Even though a
piece of bread is solid, it has molecules which move. When the bread
is toasted, these molecules move faster.
Cold butter also has molecules. They move very slowly because
they are cool. But when you put the butter on hot toast, the fast
moving molecules in the bread hit the slow moving molecules in the
butter. The motion passes between the molecules until the butter
becomes soft and warm.
Because they are so cold, ice cubes have very slow-moving
molecules. Fruit juice, on the other hand, has molecules with more
heat energy which move faster. When you put ice in a glass of fruit
juice, the molecules in the juice lose energy and slow down. The
juice stays cool until all the ice melts.
Vocabulary
3. Fill in the blanks with the words from the box in an appropriate
form (one word is extra):
to melt, to spread, to move, to slow down, to do, coo, to move, fast
1. When you put cold butter on hot bread you see that it_____ stay
cold for very long.
2. Heat from the bread causes the butter to_______________.
3. Heat_______________from warm things to cold things.
4. A piece of bread is not soft, but it also has__________molecules.
5. When bread is toasted, the molecules in the bread begin to____
faster.
6. Ice cubes have very slow moving molecules because they are
very________.
7. When juice gets colder, the molecules in the juice lose energy
and_________.
Speaking
4. Think of at least 3 questions to ask your partner about the process
of evaporating water from the earth into the sky and return to earth
as rain. Use ideas from the text.
For example:
1. Water evaporates from
the surface of the oceans, then …
2. After that … .
3. Secondly … .
4. Thirdly… .
5. In the end … / Finally … . 
UNIT XX                                                                  butter. The motion passes between the molecules until the butter
Moving molecules                                                         becomes soft and warm.
Before you start                                                               Because they are so cold, ice cubes have very slow-moving
1. Answer the following questions:                                       molecules. Fruit juice, on the other hand, has molecules with more
1. If you put a cup of ice cream under the sun, what happens? Why?       heat energy which move faster. When you put ice in a glass of fruit
2. If you put a glass of water in the freezer, what happens? Why?        juice, the molecules in the juice lose energy and slow down. The
3. Why do we put ice in our drinks in the summer?                        juice stays cool until all the ice melts.
4. Why does butter melt on toasted bread?                                Vocabulary
Reading                                                                  3. Fill in the blanks with the words from the box in an appropriate
2. Read the text and decide if the sentences (1-10) below are true (T)   form (one word is extra):
or false (F):
1. Heat spreads from cold things to warm things.                         to melt, to spread, to move, to slow down, to do, coo, to move, fast
2. Bread doesn't have any molecules because it is solid.                 1. When you put cold butter on hot bread you see that it_____ stay
3. When you toast bread, the molecules in it move faster.                cold for very long.
4. The molecules in cold butter are not moving.                          2. Heat from the bread causes the butter to_______________.
5. Molecules in ice cubes move faster than those in fruit juice.         3. Heat_______________from warm things to cold things.
6. Before butter becomes soft and warm, the molecules in the butter      4. A piece of bread is not soft, but it also has__________molecules.
  don't move.                                                            5. When bread is toasted, the molecules in the bread begin to____
7. Heat causes things to melt.                                           faster.
8. Cold things move slowly.                                              6. Ice cubes have very slow moving molecules because they are
9. Heat is a type of molecule.                                           very________.
10. When you put ice in fruit juice, the molecules in the juice move     7. When juice gets colder, the molecules in the juice lose energy
  faster.                                                                and_________.

                                                                         Speaking
      Did you put butter on your toast at breakfast this morning? If
                                                                         4. Think of at least 3 questions to ask your partner about the process
you did, you must have noticed that the butter didn't stay cold for
                                                                         of evaporating water from the earth into the sky and return to earth
very long. Heat from the toast passed into the butter and caused it to
                                                                         as rain. Use ideas from the text.
melt.
                                                                         For example:
      Heat is a type of energy, and it spreads from warm things to
                                                                         1. Water evaporates from
cold things. Moving molecules pass the heat along. Even though a
                                                                         the surface of the oceans, then …
piece of bread is solid, it has molecules which move. When the bread
                                                                         2. After that … .
is toasted, these molecules move faster.
                                                                         3. Secondly … .
      Cold butter also has molecules. They move very slowly because
                                                                         4. Thirdly… .
they are cool. But when you put the butter on hot toast, the fast
                                                                         5. In the end … / Finally … .
moving molecules in the bread hit the slow moving molecules in the

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