Chemistry Fundamentals

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  • Created by: SummayaM
  • Created on: 07-08-17 07:48
How many atoms does a full stop have?
Two Million
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What is the value of 1 amu?
1.661x10^-27 kg
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How was the diameter of atoms determined?
X rays
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The diameter of an atom is of which order
2x10^-10m
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The wavelength of electrons is _______ that of light
Shorter than
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Who used the word atomos to describe the basic,indivisble unit of matter?
Democritus
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John Dalton explained that the existence of atoms could explain which law?
Law of Conservation of Mass
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What is the smallest part of an element that can take part in a chemical reaction?
Atom
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How many particles are thought to exist in an atom?
More than 100
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Who determined the atomic masses of elements?
Berzelius
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Who developed the system of giving an element a symbol?
Berzelius
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What is the order of wavelengths of visible light?
Nanometre
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What is the smallest size that can be seen by an light microscope?
500nm
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What is the smallest particle of a pure substance that can exist independently?
Molecule
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How many times is hemoglobin heavier than hydrogen atom?
68000
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Each molecule of hemoglobin is made up of how many atoms?
10,000
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Formation of a positive ion is a _____ reaction.
Endothermic
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The first electron affinity is
Exothermic
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Positive ions have a group of atoms are more or less common?
Less
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A molecule loses or gains an electron to form
Molecular Ion
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Which molecular ions are more abundant?
Cationic
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How can molecular ions be generated?
Passing high energy electron beam or alpha partics or X rays through a gas
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To what is the mass of an atom of an element compared to?
Mass of an atom of carbon-12
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Which unit is used to express relative atomic mass?
amu
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What is the amu of hydrogen 1?
1.008
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What is the amu of Cu?
63.546
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Who first discovered the phenomenon of istopy?
Soddy
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How many isotopes does carbon have?
3
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How many isotopes does hydrogen have?
3
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How many isotopes does oxygen have?
3
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How many isotopes does nickel have?
5
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How many isotopes does calcium have?
6
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How many isotopes does tin have?
11
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How many isotopes does cadmium have?
9
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How can the relative abundance of isotopes be determined?
Mass Spectrometry
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How many isotopes occur in nature?
280
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How many natural radioactive isotopes are there?
40
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How many artifical radioactive isotopes are there?
300
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What do arsenic, fluorine, iodine and gold have in common?
They have 1 isotope
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In general, the elements of odd atomic number have how many isotopes?
Not more than two stable isotopes
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Out of 240 naturally occurring isotopes, how many have even mass number and even atomic number?
154
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What do the x-axis and y-axis in a mass spectrometer plot graph represent?
Mass to charge ratio, Relative number of ions
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When is Aston's mass spectrograph used?
Identify isotopes on basis of atomic masses
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When is Dempster's mass spectrograph used?
Identification of elements in solid state
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In a mass spectrometer, what is the pressure of the vapor?
10^-6 to 10^-7 torr
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What value of potential difference is applied in a mass spectrometer?
500-2000V
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What separates the ions in a mass spectrometer on the basis of their m/e values?
Magnetic Field
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Which formula is correct for m/e?
H^2r^2/2E
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What measures the relative abundance of ions of a definite m/e value?
Strength of electric current
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In combustion analysis, what absorbs H2O?
Mg(ClO4)2
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In combustion analysis, what absorbs CO2?
50% KOH
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What is the mass of one mole of Magnesium?
24
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Which element is Magnesium twice as heavy as?
Carbon
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When does molar volume apply?
When the gas is ideal
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What is assumed when doing stoichiometric calculations?
Reacants are completely turned into products
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Other cards in this set

Card 2

Front

What is the value of 1 amu?

Back

1.661x10^-27 kg

Card 3

Front

How was the diameter of atoms determined?

Back

Preview of the front of card 3

Card 4

Front

The diameter of an atom is of which order

Back

Preview of the front of card 4

Card 5

Front

The wavelength of electrons is _______ that of light

Back

Preview of the front of card 5
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