Term
| Why do biologists need to know Chemistry? |
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Definition
| It helps them understand how living things function. |
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Term
| What is the difference between matter and mass? |
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Definition
| Matter occupies space and has mass. Mass is the quantity of matter an object has. |
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Term
| What is the difference between weight and mass? |
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Definition
| Weight includes gravity, and mass does not. |
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Term
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Definition
| A pure substance that is made up of one atom and cannot be broken down into simpler kinds of matter. |
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Term
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Definition
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Term
| What is the atomic mass of an electron? |
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Definition
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Term
| What does the atomic number tell you? |
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Definition
| How many protons or electrons are in the atom |
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Term
| What does atomic mass tell you? |
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Definition
| # of protons + # of neutrons |
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Term
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Definition
| The model that shows how many protons, electrons, and neutrons there are in an atom. |
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Term
| What are valence electrons? |
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Definition
| Electrons that are on the outermost energy level |
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Term
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Definition
| atoms of the same element that differ in the number of neutrons they contain. |
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Term
| What are the 4 uses of radioactive isotopes? |
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Definition
1. killing bacteria found on foods
2. "tracers" to follow the movement of substance through the body
3. to determine the age of rocks and fossils
4. detect and treat cancer |
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Term
| How is a molecule formed? |
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Definition
| When 2 or more atoms join chemically. |
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Term
| How is a molecule formed? |
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Definition
| When 2 or more atoms join chemically. |
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Term
| How is a compound formed? |
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Definition
| When 2 or more different elements join together chemically. |
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Term
| What does a chemical formula show? |
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Definition
The type and number of atoms in a molecule or compound.
Same as a Molecular Formula |
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Term
| What does a Molecular formula show? |
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Definition
The number of atoms for each element in a molecule or compound.
same as a chemical formula |
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Term
| What is a Structural Formula? |
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Definition
| A diagram that shows how atoms are joined together. |
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Term
| Most atoms are unstable because _____ |
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Definition
| The outer energy is not full |
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Term
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Definition
| stable atoms in their natural state |
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Term
| A single bond is when _______ |
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Definition
| electrons are being shared between 2 atoms |
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Term
| What is a Lewis Dot structure? |
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Definition
| a structure that determines the number of valence electrons used in bonding. |
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