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7 Cards in this Set
- Front
- Back
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Chemical reactions take place more rapidly at high temperatures. In view of what you have learned about the movement of molecules, why do you think this is true? |
The state of matter exists upon the speed of movement of the molecules which compose it. The speed of movement depends on the temperature. For example, water when water is frozen (in solid form) the movement of molecules remain fixed and vibrate back and forth, meanwhile when it is melted (liquid form) the molecules move faster and can move freely, that is why chemical reactions are faster in high temperatures. |
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How may movement of molecules be demonstrated visually even though the molecules themselves cannot be seen? What is this movement called? |
It is called the brownian movement. The molecules can be seen in the laboratory and view them under the microscope (moving back and forth rapidly in different directions) |
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The number of different kinds of elements is the same as the number of different kinds of atoms? Explain why this is true. |
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The oxygen of the air exists as compound, yet oxygen is an element. How is it possible for an element to be a compound? |
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Difference between mixtures and compounds |
A compound is a substance formed by the chemical union of two or more elements. Mixtures are combinations of different elements or compounds in which there is little if any, chemical union of the combined parts |
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Similarity of Solar system and the structure of an atom |
The large sun is equivalent to the nucleus and the smaller planets are the electrons. They are both elliptical. |
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Nature of each subatomic particles which make up an atom |
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