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問題一覧
1
What is Democritus known for?
How many times can you break something in half, Coined term atom
2
Who coined the term atom?
Democritus
3
Who thought that if you keep breaking something in half there will be a point you can break it no more?
Democritus
4
What did John Dalton come up with?
Each element is made up of tiny indivisible particles called atoms., The atoms of each given element are identical., Chemical compounds form when atoms combine with each other. These compounds are formed in whole number ratios., Chemical reactions involve reorganization of the atoms. Atoms are not created or destroyed during a reaction., Compounds have unchanging formulas., A given compound always contains the same properties of elements by mass., When 2 elements form a series of compounds, the ratios of the masses of the second element that combine with 1g of the first element cab always be reduced to small whole numbers., Sometimes 2 elements come together in more than one way, forming compounds with similar, though not identical formulas.
5
What was John Daltons proffesion?
English school teacher
6
Who came up with early atomic theory?
John Dalton
7
Who came up with compounds have an unchanging chemical formula?
John Dalton
8
Who came up with the idea that the atoms in each element are identical?
John Dalton
9
What did J.J. Thomson do?
Discovered the electron and proposed a model for the structure of the atom.., Knew electrons had a negative charge and thought that matter must have a positive charge. His model looked like raisins stuck on the surface of a lump of pudding.
10
Who created the plum pudding model?
J.J. Thomson
11
Who performed the cathode ray experiment?
J.J. Thomson
12
What did J.J. Thomson work as?
Enlish physicist
13
Who showed that when you vibrate atoms strong enough, such as when you heat an object until it glows, you can measure the energy in only discrete units? These energy packets are called quanta.
Max Planck
14
What was Max Planck's job?
German physicist
15
Who explained that light absorption can release electrons from atoms, a Phenomenon called the " photoelectric effect"?
Albert Einstein
16
When photons/light shines on atoms what happens?
Electrons are released
17
who performed the gold foil experiment?
Ernest Rutherford
18
Who bombarded a piece of gold foil with alpha particles?
Ernest Rutherford
19
What are alpha particles?
Helium atom without electrons
20
What did Ernest Rutherford do?
Gold foil experiment, Discovered that atoms consist of a compact, positively charged nucleus, around which negative electrons circulate at a relatively large distance., The nucleus occupies less than one-thousand-million millionths of the atomic volume, but contains almost all of the mass.
21
Who said that electrons do not spiral into the nucleus?
Niels Bohr
22
What are Niels Bohr's rules?
Electrons can orbit only at a certain allowed distance from the nucleus., Atoms radiate energy when an electron jumps from a higher-energy orbit to a lower-energy orbit. Also, an atom absorbs energy when an electron gets boosted from a low-energy orbit to a high energy orbit., The electron can existb in only one of the orbits. , Llight, photons, emit whenever an electron jumps from one orbit to another. The jumps seem to happen instantaneously without moving through a trajectory.
23
Who discovered the neutron?
James Chadwick
24
What did James Chadwick do?
Discovered the neutron, Neutrons measured slightly heavier than the proton with no charge.
25
What was James Chadwicks Job
English physicist
26
What was Niels Bohr job?
Danish physicist
27
What are daltons 2 theories?
Law of definite proportion, Law of multiple proportions