Term
| What are five characteristics of metals (in their pure elemental state)? |
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Definition
Shiny
Dense
High melting point
malleable (bendable)
Conducts electricity |
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Term
| Which element's most common isotope has no neutron? |
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Definition
| Hydrogen - it's atomic weight is 1 - the weight of a single proton. There can be other isotopes of hydrogen with a neutron, but these are rare. |
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Term
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Definition
| An atomic mass unit, the weight of a proton (or neutron). An atom's "amu's" are equal to it's atomic weight. Thus, "amu's" are used to describe the weight of molecules of more than one element. |
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Term
| What is the weight of Glucose (C6H12O6) in amu's? |
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Definition
180m amu There are six carbon atoms, each weighing 12 amu = 72 amu There are 12 Hydrogen atoms each weighing 1 amu = 12 There are 6 Oxygen atoms each weighing 16 amu = 96
96+12+72=180 |
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Term
| What symbol can be used to represent amu? |
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Definition
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Term
| What common molecule has a polar covalent bond? |
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Definition
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Term
| What common substance is an example of an ionic molecular bond? |
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Definition
| Sodium Chloride NaCl - table salt |
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Term
| What is Agravado's Number and what does it represent? |
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Definition
| 6.02 x 1023 Agravado's number is a conversion factor to convert amu's to grams. 6.02 x 1023 amu = 1 gram |
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Term
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Definition
| A mole is a specific quantity atoms or molecules of an element of substance. Specifically 6.02 x 1023 atoms or molecules. |
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Term
| If Aluminum (Al) has an Atomic Weight of 27 - how many grams in a mole of Aluminum? |
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Definition
27 grams
!!! So - a mole on any element has a weight equal to the number of grams of it's Atomic Weight. |
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Term
| What is the weight in grams of a mole of water (H2O)? |
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Definition
| Two Hydrogens each at 1 grams per mole = 2 grams. Oxygen has 16 grams per mole, so a mole of H2O = 16 + 2 + 18 grams |
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Term
| What is the difference between Carbons most two common isotopes? |
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Definition
| Carbon 12 (12C) has 6 protons and 6 neutrons and is the most common isotope of Carbon. Carbon 14 (14C) has 6 protons and 8 neutrons (equaling 14) |
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