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28
15. a) jar; b) tight; c) cope; d) hot; e) hot; f) expand; g) expand; h) metal; i)
metal; j)expand.
16. A. a- T, b- F (it actually decreases in volume until it reaches 4
o
C), c – F
(water has its greatest density at 4
o
C), d – T, e- F, f- T
B a) surface; b) greater; c) below; d) 4
o
C; e) surface; f) less; g) reduces; h)
bottom
17. –
18. –
19. 1) was, had not been; 2) came, had forgotten; 3) had not checked, broke
down; 4) had lent; 5) came, had been; 6) had already started, arrived, 70 had never
heard,; 8) found, had hidden.
20. 1) Helen, because she had been repairing her car.
2) Kate, because she had been (doing some) gardening.
21. 1) She had been walking.
2) He has been swimming.
3) He has lost his wallet.
4) He had gathered enough material.
5) He had been running for hour.
6) She had cleaned the house.
7) She has been crying.
Unit 5
1. a) When two objects at different temperatures are put in contact, heat spon-
taneously flows from the hotter one to the colder one.
b) Heat flows spontaneously from an object at higher temperature to one at
lower temperature. For example, when a fever thermometer is first put in a patients
mouth, heat is flowing from the patient’s mouth to the thermometer; when the tem-
perature reading stops increasing, the thermometer is then in equilibrium with the
person’s mouth and they are at the same temperature.
c) 1. Heat generated by the body must be transferred to outside. To prevent
this we commonly wear clothes to be warm.
2. Pot holders are made of cloth, a poor thermal conductor, thus prevent-
ing heat from being conducted to the hand, causing a burn.
2. a) in contract; b) spontaneous; c) added to; d) different; e) capacity; f)
change.
3. 1 – H; 2 – D; 3 – E; 4 – A; 5 – C; 6 – F.
4. –
5. 1) order; 2) small; 3) imbalance; 4) external; 5) different; 6) remove; 7) de-
crease.
6. 1) thermal; 2) heat; 3) ultimate; 4) energy; 5) diet; 6) temperature; 7) inter-
nal; 8) specific; 9) equal; 10) pure.
7. 1) diet calorie; 2) ultimate source; 3) pure… water; 4) thermal equilibrium;
5) equal amount; 6) temperature changes; 7) heat flow; 8) internal forces; 9)specific
heat; 10) energy unit.
28
15. a) jar; b) tight; c) cope; d) hot; e) hot; f) expand; g) expand; h) metal; i)
metal; j)expand.
16. A. a- T, b- F (it actually decreases in volume until it reaches 4oC), c –F
(water has its greatest density at 4oC), d –T, e- F, f- T
B a) surface; b) greater; c) below; d) 4oC; e) surface; f) less; g) reduces; h)
bottom
17. –
18. –
19. 1) was, had not been; 2) came, had forgotten; 3) had not checked, broke
down; 4) had lent; 5) came, had been; 6) had already started, arrived, 70 had never
heard,; 8) found, had hidden.
20. 1) Helen, because she had been repairing her car.
2) Kate, because she had been (doing some) gardening.
21. 1) She had been walking.
2) He has been swimming.
3) He has lost his wallet.
4) He had gathered enough material.
5) He had been running for hour.
6) She had cleaned the house.
7) She has been crying.
Unit 5
1.a) When two objects at different temperatures are put in contact, heat spon-
taneously flows from the hotter one to the colder one.
b) Heat flows spontaneously from an object at higher temperature to one at
lower temperature. For example, when a fever thermometer is first put in a patients
mouth, heat is flowing from the patient’s mouth to the thermometer; when the tem-
perature reading stops increasing, the thermometer is then in equilibrium with the
person’s mouth and they are at the same temperature.
c) 1. Heat generated by the body must be transferred to outside. To prevent
this we commonly wear clothes to be warm.
2. Pot holders are made of cloth, a poor thermal conductor, thus prevent-
ing heat from being conducted to the hand, causing a burn.
2. a) in contract; b) spontaneous; c) added to; d) different; e) capacity; f)
change.
3. 1 – H; 2 – D; 3 – E; 4 – A; 5 – C; 6 – F.
4. –
5. 1) order; 2) small; 3) imbalance; 4) external; 5) different; 6) remove; 7) de-
crease.
6. 1) thermal; 2) heat; 3) ultimate; 4) energy; 5) diet; 6) temperature; 7) inter-
nal; 8) specific; 9) equal; 10) pure.
7. 1) diet calorie; 2) ultimate source; 3) pure… water; 4) thermal equilibrium;
5) equal amount; 6) temperature changes; 7) heat flow; 8) internal forces; 9)specific
heat; 10) energy unit.
