Flashcards
Module 2
Flashcards do conjunto (14)
- 1What is Daltons Atomic theoryAll matter (elements) are composed of tiny,
indivisible particles called atoms
All All atomsatoms of a given element are identical to each of a given element are identical to each
other andother and
A chemical reactionchemical reaction merely involves a change in merely involves a change in
the groupings of the groupings of atomsatoms and not creation or and not creation or
destruction of destruction of atoms - 2What is an isotope?atoms (of same element) that have the same
number of protons, but different numbers of
neutrons. - 3What is an atom?The idea of a unit to to
denote a specific denote a specific
number of items is number of items is
not new. - 4What is a mole?A mole (number) corresponds to
• the number of atoms in exactly 12 g of the
pure 12C isotope (the standard)
• 1 mol C atoms = 6.022 1023 C atoms = 12 g 12C
• (Avogadro’s constant); (Avogadro’s number).
After Italian physicist Amedeo Avogadro. - 5What is molar mass?The molar mass of any element is the mass in
grams of 6.022 1023 atoms of that element,
i.e., mass of one mole of the element.
molar mass= g/mol - 6What are groups on the periodic table?referred to by number or top element
• some have special names - 7What is Group 1A?alkali metals includes
lithium, sodium, potassium, rubidium,
cesium, and francium - 8What is group 2A?alkaline earth metals
- 9What is group 8A?noble gases
- 10What is group 7A?Halogens includes
fluorine(g),
chlorine(g),
bromine(l), and
iodine(s);
(At, astatine). - 11What is group 6A?chalcogens
- 12What is group 5A?pnictogens
- 13What is group 18?are monatomic gases; not very abundant on
Earth; helium, He, is the second in the
universe after hydrogen, H2. Used in advertising signs; inert conditions
• Some lasers are made of He, Ar, Kr
Are the least reactive elements
A few compounds of the heavier ones; XeOF44 - 14What are the 3 properties of metals?Solids at room temperature
• Luster (lustre)
• Malleable:
• Ductile:
{except for Hg(l)}
(high mp, bp)
glow or shine
can be hammered or pressed into
new shapes (coins, rings, etc.)
can be pressed, beaten, or drawn into
shape when cold (wires, such as Cu)
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- GRE Chemistry FlashCards sobre Module 2, criado por madison Benson em 01-03-2022.
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- madison Benson
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