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UNIT 1 "Matter and Atoms" Flashcards | StudBud

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UNIT 1 "Matter and Atoms"

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Quiz Review for Ch.1 and Ch. 2 matter and atoms topics

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Questions 12

Answers

1
How many neutrons are in the nucleus of Lithium-7 isotopes?
7
4
3
0
2
What did Rutherford conclude from his Gold Foil experiment?
Atoms have a dense, positively charged nucleus
Atoms have nuclei that absorb alpha particles
Atoms are solid particles with no empty space
Atoms contain only neutrons and electrons
3
A chemical change always results in...
a violent explosion
rearrangement of atoms to form matter with a new identity
the formation of a solid
a color change
4
An example of a homogeneous mixture is:
air
milk
all of these are homogeneous mixtures
blood
5
Neutrons:
prevent proton repulsion
are lighter than electrons
are found in the electron cloud
have a positive charge
6
An extensive property:
can only be observed with pure element samples
is consistently measured regardless of sample size
depends on the quantity of matter being observed
is used to describe radioactive isotopes
7
Which cation has 10 electrons?
All of these have 10 electrons
Mg+2
Na+1
Al+3
8
The atomic number of all Boron ions isotopes is:
10
It depends on the number of neutrons present
11
5
9
Why is carbon dioxide a pure substance?
Because CO2 samples have inconsistent properties
Because CO2 is common on Earth
Because every molecule is 1 C atom bonded to 2 O atoms
Because it is a gas and all gases are pure
10
Which of the following is NOT considered pure matter?
CH4
Au
NaCl
Air
11
Which scientist organized scientific work into a "Modern Atomic Theory"
JJ Thomson
John Dalton
Ernest Rutherford
Marie Curie
12
Which is NOT a physical property of Aluminum:
Reactivity with acid to produce hydrogen gas
Melting Point = 660 degrees Celsius
Density = 2.70 g/mL
Shiny, silver colored surface