What is science? Science is an endeavor to discover how nature works and to use that
knowledge to make predictions about what is likely to happen in nature.
What is matter? Matter is anything that has mass and takes up space.It is found in two
chemical forms. element and compounds.
How can matter change? When a sample of matter undergoes a physical change,its chemical
composition,or the arrangemant of its atoms or ions does not change
In a chemical change,the arrangement of ions,atoms,or molecules.
Matter can undergo three type of nuclear,radiactive decay,
unclear fission,and unclear fusion.
What is energy and how can it change its form? Energy is the capcity to do work or transfer
heat. High-quality energy and low-quality
energy
How can we use energy and matter more sustainably? We can shift to matter-recycling and
reuse economics
2008年10月8日 星期三
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