Miscelleaneous

What are five characteristics of metals (in their pure elemental state)?
Shiny
Dense
High melting point
malleable (bendable)
Conducts electricity
Which element’s most common isotope has no neutron?
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.
What is an “amu”
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.
What is the weight of Glucose (C6H12O6) in amu’s?

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

What symbol can be used to represent amu?
u
What common molecule has a polar covalent bond?
Water H2O
What common substance is an example of an ionic molecular bond?
Sodium Chloride NaCl – table salt
What is Agravado’s Number and what does it represent?
6.02 x 1023 Agravado’s number is a conversion factor to convert amu’s to grams. 6.02 x 1023 amu = 1 gram
What is a mole?
A mole is a specific quantity atoms or molecules of an element of substance. Specifically 6.02 x 1023 atoms or molecules.
If Aluminum (Al) has an Atomic Weight of 27 – how many grams in a mole of Aluminum?
27 grams
!!! So – a mole on any element has a weight equal to the number of grams of it’s Atomic Weight.
What is the weight in grams of a mole of water (H2O)?
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
What is the difference between Carbons most two common isotopes?
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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