Term
| Identify the four elements that make up 96% or living matter. |
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Definition
| Carbon, oxygen, hydrogen, and nitrogen. |
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Term
| Distinguish between an element and a compound. |
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Definition
Element: a substance that cannot be broken down to other substances by chemical reactions. Compound: a substance consisting of two or more different elements combined in a fixed ratio. |
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Term
| Define the term "Trace Element" and give an example. |
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Definition
Those required by an organism in only minute quantities. Example: |
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Term
| Draw and label a simplified model of an atom. Explain how this model simplifies our understanding of atomic structure. |
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Definition
| Hydrogen (He) Atom. This helps simplify our understanding of an atom by showing its smaller parts. |
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Term
Distinguish between each of the following pairs of terms:
a. neutron and proton
b. atomic number and mass number
c. atomic weight and mass number |
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Definition
a. neutron: neutral
proton: positive
b. atomic number: number of protons
mass number: sum of protons and neutrons
c. atomic mass: the total mass of an atom
Mas number: sum of protons and nuetrons |
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Term
| Explain how the atomic number and mass number of ana tom can be used to determine the number of neutrons. |
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Definition
| the mass number minus the atomic number equals the number of neutrons. |
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Term
| Explain how two isotopes of an element are similar. Explain how they are different. |
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Definition
| In an isotope of an element, the number of protons stay the same but the number of neutrons differ. |
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Term
| Describe two biological applications that use radioactive isotopes. |
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Definition
1. used in fossils to date those relics of past life.
2. used as tracers to follow atoms through matabolism, the chemical process of an organism. |
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Term
| Describe two biological applications that use radioactive isotopes. |
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Definition
1. used in fossils to date those relics of past life.
2. used as tracers to follow atoms through matabolism, the chemical process of an organism. |
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Term
| Define the terms "Energy" and "Potential Energy". Explain why electrons in the first electron shell have less potential energy than electrons in higher electron shells. |
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Definition
Energy: the capacity to cause change.
Potential energy: matter posesses because of its location or structure. |
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Term
| Define the terms "Energy" and "Potential Energy". Explain why electrons in the first electron shell have less potential energy than electrons in higher electron shells. |
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Definition
Energy: the capacity to cause change.
Potential energy: matter posesses because of its location or structure. |
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Term
| Define the terms "Energy" and "Potential Energy". Explain why electrons in the first electron shell have less potential energy than electrons in higher electron shells. |
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Definition
Energy: the capacity to cause change.
Potential energy: matter posesses because of its location or structure. |
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