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15 Cards in this Set
- Front
- Back
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Matter |
Occupies space and has mass |
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Examples of matter: |
Solids Liquids Gases |
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Physical changes do not alter |
basic nature of substance |
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Chemical changes change |
the composition of the substance |
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Energy is massless and does not... |
occupy space |
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Energy is defined as |
the ability to do work |
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Kinetic energy is |
actually doing work ex: muscle contraction
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Potential energy is |
stored or inactive energy ex: our muscles have stored kinetic energy |
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Elements: How many? Most common? |
112 elements, 92 naturally occuring Oxygen, carbon, nitrogen, gold, and iron |
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What elements make up 96% of body weight? |
Oxygen Nitrogen Hydrogen Carbon |
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The smallest particle that still retains its special properties |
atom |
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Most common chemicals in the body |
Carbohydrates Lipids Proteins |
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Carbohydrates |
sugars and starches, contain C, H, O |
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Lipid |
insoluble in water, contain C, H, O but less oxygen, some have phosphorus |
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Protein |
enzymes, hemoglobin, contractile proteins, contain C, H, O, N |
