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Chemistry 1/2 > History > Flashcards

History Flashcards

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0
Q

J.J. Thompson

A

Cathode ray tube emit subatomic particles from a source deflected from positive magnet

Plum pudding

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1
Q

John dalton

A

1803
Small solid ball of matter
Billiard ball theorem
Atoms held together by forces of attraction
Chemical reactions have atoms being separated and rearranged

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2
Q

Ernest Rutherford

A

1911
Alpha particles at high velocity
Gold foil

Mostly space
Nucleus concentrated in center
Positively charged - protons

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3
Q

Neil’s Bohr

A

1913
Shells - energy levels
Solar system

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4
Q

Flame test

A 
Electron get excited by heat energy
Jump energy levels
Are unstable
Return back to lower level 
Release energy in form of light ( seen or unseen )

Sometimes electrons are bound too tightly for jumping

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5
Q

Electron configuration

A

2n2

The third shell cannot be filled with more than 8 until there are at least 2 in the 4th shell.

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6
Q

Erwin schroedinger

A 
Electron cloud model 
Atoms 
Shells
Subshells - spdf
Orbitals 
Electrons
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7
Q

Subshells order

A 
1s 
2s 2p
3s 3p 3d 
4s 4p 4d 4f 
5s 5p 5d 5f 
6s 6p 6d 
7s 7p 7d
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8
Q

James Chadwick

A

1932
Bombard beryllium with alpha
Neutrons in Be get displaced
Neutrons do not get deflected by electric and magnetic fields

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9
Q

Frederick Soddy

A

Isotope

“Two kinds of thorium”

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10
Q

Robert Boyle

A

1661

Define elements

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11
Q

Joseph preisteley

A

Isolate oxygen

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12
Q

Anthony Lavoisier

A

Law of conservation of mass

Mass of reactants=mass of products

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13
Q

Dimitri Mendeleev
John new lands
Lothar Meyer

A

Organisation of periodic table

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14
Q

Dimitri Mendeleev

A

Increasing atomic weight
Blanks for undiscovered and guessed properties
Transition elements
Chemical changes across rows

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15
Q

John Rayleigh

A

1894
Argon
Non reactive

16
Q

William Ramsay

A

Discovered helium, neon, krypton, xenon

17
Q

Metal+water =

A

Metal oxide + hydrogen

18
Q

How many elements are lanthanides/actinides ?

A

14

19
Q

Atomic size increases…

Decreases…

A

Down a group

Across a period

20
Q

Electronegativity what is it?

A

The amount of electrostatic attraction between nucleus and electrons.

21
Q

Electro negativity increases….. Decreases…..

A

Across a period

Down a group

22
Q

Ionisation energy

A

The energy needed to remove electron(s) from valence shell.

23
Q

Ionisation energy is more needed….. Less needed

A

Across a period

Down a group

24
Q

Core charge , what is it ?

A

Valence electrons that an atoms is able to lose or gain

25
Q

Core charge increases…

Decreases….

A

Across a period

Down a group

26
Q

Law of conservation of mass

A

During a chemical reaction, mass of reactants equals to mass of products

27
Q

Who defined an element and when

A

Robert Boyle

1661

28
Q

Who isolated elemental oxygen ?

A

Joseph Priestley

29
Q

Who stated the law of conservation of mass ?

A

Antoine Lavoisier

30
Q

Who discovered elements and they atomic mass ?

A

Jon’s Jakob Berzelius

31
Q

Who are the three who contributed to the periodic table ?

A

John new lands
Dimitri Mendeleev
Lothar Meyer

32
Q

When did Mendeleev discover periodic table ?

A

1869

33
Q

How did he arrange elements ?

A

By atomic mass

Similar chemical properties - groups

Chemistry 1/2 (3 decks)

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