Week 1 - Isotopes, atoms and climate reconstruction.
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Homogenous mixture?
Has a uniform appearance.
Heterogenous mixture?
Has a variable appearance.
Molecule?
Substance composed of 2 or more atoms.
Compound?
Molecule with atoms of different elements. (If the atoms are the same elements its just still a molecule)
Element?
Simplest form of a substance that can occur in nature.
Atom?
Smallest unit of an element.
True or false? The names of chemical substances only start with a capital letter if they begin a sentence?
True.
Word cue - Negligable
The charge of a neutron The mass of an electron As they’re both zero
Atomic number?
Number of protons in the nucleus.
Mass number?
Number of protons and electrons in the nucleus.
Isotope?
Atoms of same element and number of protons but a different number of neutrons.
How is atomic mass measured?
relative to a 12C atom (So a usual carbon atom).
What’s the relative atomic mass (RAM) of an element?
Overall mass of elements protons and neutrons when off periodic table - simple rounded number top left of symbol When on periodic table its average sum of the masses of the elements isotopes weighed based on their abundances - bottom number under symbol much more specific.
Word cue -Water
• 16O and 18O water reservoir climate cycle • Water is a Compound and made of Molecules and Atoms • Structure of a water molecule?
Temperature isotope relationship?
Water molecules containing heavier isotope evaporate less readily.
Fractionation?
Disproportional evaporation.
Calcareous?
(In animals); Extract calcium carbonate from water to form skeletal material.