What happens to the energy of a substance when it changes from a liquid to a solid (solidifying)? ๅฝ็ฉ่ดจไปๆถฒไฝๅๆๅบไฝ๏ผๅๅบ๏ผๆถ๏ผๅฎ็่ฝ้ๅ็ไบไปไนๅๅ๏ผ
The substance loses energy and the particles move slower. ็ฉ่ดจๅคฑๅปไบ่ฝ้๏ผๅพฎ็ฒ่ฟๅจๅๆ ขใ
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15
If a material changes from a solid to a liquid, does it become a completely different substance? ๅฆๆไธ็งๆๆไปๅบไฝๅๆๆถฒไฝ๏ผๅฎไผๅๆไธ็งๅฎๅ จไธๅ็็ฉ่ดจๅ๏ผ
No. A change of state is a physical change, so the substance stays the same. ไธไผใ็ถๆๅๅๆฏ็ฉ็ๅๅ๏ผๆไปฅ็ฉ่ดจไฟๆไธๅใ
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15
Why can you smell a cake baking in the kitchen even if you are in the living room? ไธบไปไนๅณไฝฟไฝ ๅจๅฎขๅ ๏ผไน่ฝ้ปๅฐๅจๆฟ้ๆญฃๅจ็ค็่็ณๅณ๏ผ
The particles in a gas (the smell) move very fast and spread out to fill the space. ๆฐไฝ๏ผๆฐๅณ๏ผไธญ็ๅพฎ็ฒ่ฟๅจ้ๅธธๅฟซ๏ผๅนถๆฉๆฃๅกซๅ ๆดไธช็ฉบ้ดใ
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15
Can energy change from one form to another? Give an example from your house. ่ฝ้ๅฏไปฅไปไธ็งๅฝขๅผ่ฝฌๅไธบๅฆไธ็งๅฝขๅผๅ๏ผ่ฏทไธพไธไธชๅฎถ้็ไพๅญใ
Yes. For example, a lightbulb changes electrical energy into light and heat energy. ๅฏไปฅใไพๅฆ๏ผ็ฏๆณกๅฐ็ต่ฝ่ฝฌๅไธบๅ ่ฝๅ็ญ่ฝใ
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15
Name two Electrical Appliances you have at home and explain what they do. ๅไธพไธคไธชไฝ ๅฎถ้็็ตๅจ๏ผๅนถ่งฃ้ๅฎไปฌ็ไฝ็จใ
When we hit a drum, why does it make a sound? ๅฝๆไปฌๆฒๅป้ผ้ขๆถ๏ผไธบไปไนไผๅๅบๅฃฐ้ณ๏ผ
The kinetic energy (movement) from hitting the drum changes into sound energy. ๆฒๅป้ผ้ขไบง็็ๅจ่ฝ๏ผ่ฟๅจ่ฝ๏ผ่ฝฌๅๆไบๅฃฐ่ฝใ
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15
Is a powder (like salt or flour) a solid or a liquid? Why can it be poured like a liquid? ็ฒๆซ๏ผๅฆ็ๆ้ข็ฒ๏ผๆฏๅบไฝ่ฟๆฏๆถฒไฝ๏ผไธบไปไนๅฎๅฏไปฅๅๆถฒไฝไธๆ ทๅพๅ๏ผ
Solid. It can be poured because the grains are so tiny, but each individual grain is a solid. ๅบไฝใๅฎๅฏไปฅๅพๅๅ ไธบ้ข็ฒ้ๅธธ็ปๅฐ๏ผไฝๆฏไธชๅ็ฌ็้ข็ฒ้ฝๆฏๅบไฝใ
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15
Why does every food chain start with a producer? Where does the producer get its energy from? ไธบไปไนๆฏไธช้ฃ็ฉ้พ้ฝไปฅ็ไบง่ ๅผๅง๏ผ็ไบง่ ไปๅช้่ทๅ่ฝ้๏ผ
Producers make their own food; they get energy from the Sun. ็ไบง่ ่ชๅทฑๅถ้ ้ฃ็ฉ๏ผๅฎไปฌไปๅคช้ณ่ทๅ่ฝ้ใ
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15
What type of energy is stored in the food we eat? ๆไปฌๅ็้ฃ็ฉไธญๅจๅญ็ๅช็ง็ฑปๅ็่ฝ้๏ผ
Chemical energy. ๅๅญฆ่ฝใ
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15
Explain the difference between a Herbivore and a Carnivore. ่งฃ้่้ฃๅจ็ฉๅ่้ฃๅจ็ฉไน้ด็ๅบๅซใ
A herbivore eats only plants. A carnivore eats only animals. ่้ฃๅจ็ฉๅชๅๆค็ฉใ่้ฃๅจ็ฉๅชๅๅจ็ฉใ
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15
If you put a cold spoon into hot tea, the spoon gets hot. Explain why this happens. ๅฆๆไฝ ๆไธๆๅทๅบๅญๆพ่ฟ็ญ่ถ้๏ผๅบๅญไผๅ็ญใ่ฏทไฝฟ็จโ่ฝฌ็งปโ่ฟไธช่ฏ่งฃ้ไธบไปไนไผๅ็่ฟ็งๆ ๅตใ
Heat energy transfers from the hot tea to the cold spoon. ็ญ่ฝไป็ญ่ถ่ฝฌ็งปๅฐๅทๅบๅญใ
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15
In a food chain where a cat eats a mouse, which animal is the Predator and which is the Prey? ๅจไธไธช็ซๅ่้ผ ็้ฃ็ฉ้พไธญ๏ผๅช็งๅจ็ฉๆฏๆ้ฃ่ ๏ผๅช็งๆฏ็็ฉ๏ผ
The cat is the predator. The mouse is the prey. ็ซๆฏๆ้ฃ่ ใ่้ผ ๆฏ็็ฉใ
