TUGAS IPA KELAS 3 SMK MUHAMMADIYAH 3 YOGYAKARTA
TUGAS IPA KELAS 3
on Sabtu, 18 Juli 2009MATERIALS
on Kamis, 26 Maret 2009
Grouping attributes MATERIALS
Materials (substances) is everything that has mass and occupies space. Stone, wood, leaves, rice, rice, water, air is a few examples of the materials. The nature of stone is different from the nature of wood. Materials have different. Nature materials can be grouped into:
[a] extensive nature:
the nature of the material that depends on the size and number of substances such as volume, mass, and weight.
[b] Intensive nature:
the nature of the material that does not depend on the number and size of oxygen. Suppose the color, smell, frozen, thaw, protracted, vapor, menyublim.
Intensive nature of a material can be grouped into:
[a] Nature Physics:
the nature of the material that can be observed without changing the materials that remained, such as color, smell, taste, violent, boiling point, and melt point.
[b] Chemical nature:
the nature of the material that can be observed in the material changes that remained, such as color changes, kereaktifan, stability, and others.
[a] extensive nature:
the nature of the material that depends on the size and number of substances such as volume, mass, and weight.
[b] Intensive nature:
the nature of the material that does not depend on the number and size of oxygen. Suppose the color, smell, frozen, thaw, protracted, vapor, menyublim.
Intensive nature of a material can be grouped into:
[a] Nature Physics:
the nature of the material that can be observed without changing the materials that remained, such as color, smell, taste, violent, boiling point, and melt point.
[b] Chemical nature:
the nature of the material that can be observed in the material changes that remained, such as color changes, kereaktifan, stability, and others.
Grouping MATERIAL CHANGES
The material can be changed. Changes in materials can be classified into two types.
[a] Change Physics
Physical changes are changes that do not result in material new material and only temporary.
Example: Water frozen into ice, sugar dissolved in water, making salt, heated metal, wood or paper cut-cut.
[b] Chemical Changes
Chemical changes are changes that produce materials and new materials can not go back into the materials origin. The material is new material that is nature-materials with different origin and nature can not be returned to the nature of their origin.
Example: the process of photosynthesis, iron rust, meledaknya bomb / firecracker, the process of fermentation, food rot, color changes, the process of respiration
[a] Change Physics
Physical changes are changes that do not result in material new material and only temporary.
Example: Water frozen into ice, sugar dissolved in water, making salt, heated metal, wood or paper cut-cut.
[b] Chemical Changes
Chemical changes are changes that produce materials and new materials can not go back into the materials origin. The material is new material that is nature-materials with different origin and nature can not be returned to the nature of their origin.
Example: the process of photosynthesis, iron rust, meledaknya bomb / firecracker, the process of fermentation, food rot, color changes, the process of respiration
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Chemistry
on Jumat, 20 Maret 2009
Chemistry (from Egyptian kēme (chem), meaning "earth") is the science concerned with the composition, structure, and properties of matter, as well as the changes it undergoes during chemical reactions. It is a physical science for studies of various atoms, molecules, crystals and other aggregates of matter whether in isolation or combination, which incorporates the concepts of energy and entropy in relation to the spontaneity of chemical processes. Modern chemistry evolved out of alchemy following the chemical revolution (1773).
Disciplines within chemistry are traditionally grouped by the type of matter being studied or the kind of study. These include inorganic chemistry, the study of inorganic matter; organic chemistry, the study of organic matter; biochemistry, the study of substances found in biological organisms; physical chemistry, the energy related studies of chemical systems at macro, molecular and submolecular scales; analytical chemistry, the analysis of material samples to gain an understanding of their chemical composition and structure. Many more specialized disciplines have emerged in recent years, e.g. neurochemistry the chemical study of the nervous system (see subdisciplines).
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