2 or more elements or compounds that are physically combined

Why were new models of the atom developed over the years?

new discoveries and previous knowledge lead to new models

What did Thomson conclude from his experiment?

neg. electrons scattered throughout a sea of positive charge

What did Rutherford's gold- foil experiment show?

There is a positively charged nucleus at the center

Which statement is NOT true about the quantum mechanical model

We know exactly where electrons travel around the nucleus

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matter and atomic theory

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All Mixed UP post lab questions #mixtures and atomic models

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Questions 18

Answers

1
Which theory stated that electrons are arranged in circular paths called energy levels?
Rutherford
Dalton
Thomson
Bohr
2
Is everything the same, or different in a pure substance?
Everything is different
Everything is the same
3
Electrons are ________ and ________ around the nucleus
negative: orbit
positive; orbit
negative; bind
positive; bind
4
Who came up with the plum pudding model?
Thomson
Bohr
Dalton
Darwin
5
What is the electron configuration for Sodium?
1s22s22p63s1
1s22s83s
1s22s83s1
1s22s22p43s1
6
What is a heterogeneous mixture?
Something that is mixed evenly
Something that is one color
Something that looks the same
Something that looks different
7
What tells us the number of protons and electrons?
atomic weight
Element name
atomic number
element symbol
8
What is a mixture?
2 or more elements or compounds that are chemically combined
2 or more elements or compounds that are physically combined
9
Who's atomic model closely resembled a sphere?
J. J. Thomson
Niels Bohr
Ernest Rutherford
Dalton
10
To separate a sugar-water mixture I would use
Chromatography
Filtration
Magnetism
Evaporation/ Distillation
11
Why were new models of the atom developed over the years?
the older models did not provide useful information
the scientists were bored
new discoveries and previous knowledge lead to new models
the scientific community demanded new models every so often
12
What particles make up the nucleus of an atom?
just neutrons
electrons and neutrons
just protons
protons and neutrons
13
What is a homogeneous mixture?
Something that is mixed unevenly
Something that looks the same
Something that is clear
Something that looks different
14
What did Thomson conclude from his experiment?
neutrons scattered throughout a sea of positive charge
neg. electrons scattered throughout a sea of positive charge
IDK
there is a nucleus at the center of an atom
15
Which model is shown?
Bohr Model
Plum Pudding
Quantum Mechanical
Dalton's Atomic model
16
What did Rutherford's gold- foil experiment show?
That atoms are small and cant be divided
There were electrons in an atom
There is a positively charged nucleus at the center
There are positively charged neutrons
17
Which statement is NOT true about the quantum mechanical model
Electrons are located in orbitals
Each energy level is divided into different sublevels
There are 4 sublevels (s,p,d,f)
We know exactly where electrons travel around the nucleus
18
What element has the electron configurations 1s²2s²2p⁵
Neon
Boron
Fluorine
Magnesium

matter and atomic theory Flashcards | StudBud