Didn't leave gaps, got non-metals and metals mixed up, elements in same group did not have similar properties
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Why did Mendeleev leave gaps?
For undiscovered elements
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How are group number and period related to electronic structure?
Group number is number of electrons in outer shell and period is the number of energy levels
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What is shielding?
When inner electrons get in the way and reduce the nucleus' attraction
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As you go down group 1, was is the trend?
They get more reactive, more likely to loose an electron as their is less attraction holding electrons in place from nucleus
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Density of alkali metals?
low density, first three less dense that water
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Industrial use for transition metals?
Iron --> catalyst in harber process
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Main ions that cause water hardness?
Calcium 2+ and Magnesium 2+
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Why is fluoride added to water?
To stop tooth decay
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What is a reversible reaction?
A reaction where the products can themselves react to produce the original reactants
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Water treatment?
Water is passed through a mesh screen to get rid of twigs, then chemicals are added to make solids stick together and sink, then water is filtered through gravel beds to get rid of small and then chlorinated to kill any microbes
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Gas formed when alcohols react with sodium?
Hydrogen
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what is the functional group of carboxylic acids?
COOH
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Two uses of alchols
organic solvents and to make esters, fuels, spirit burners
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Uses of Esters
Perfumes, aroma, solvents, ointments
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Uses of carboxylic acids
soaps and detergents and to make vinegar
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Conditions of Harber process
200 atmosphere, 450 degrees, iron catalyst
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Changing temperature and pressure do?
move point of equilibrium
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Other cards in this set
Card 2
Front
Why were Newlands' Octaves criticized?
Back
Didn't leave gaps, got non-metals and metals mixed up, elements in same group did not have similar properties
Card 3
Front
Why did Mendeleev leave gaps?
Back
Card 4
Front
How are group number and period related to electronic structure?
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