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All you need to know about chemistry in 8th grade #chemistryisnotjustblowingthingsup
Flashcards
47 cards
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Questions
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Answers
1
What important thing did Sir William Ramsay do?
discovered isotoped
made the first comprehensive periodic table
determined elements' atomic numbers
discovered the noble gases and added group 18 to the PT
2
How is the modern periodic table arranged?
In order of increasing atomic mass from top to bottom
In order of increasing atomic number from left to right
In order of metals, metalloids, and nonmetals in periods
In order of increasing atomic masses from left to right
3
What period is bromine (Br) in?
Period 4
Period 18
Period 17
Period 3
4
What does the CRC Handbook of Chemistry & Physics contain?
A list of all known mixtures.
A list of all known compounds.
A list of all known colloids.
A list of all known elements.
5
What is the smallest part of a compound that retains the properties of that compound called?
particle
atom
cell
molecule
6
What is the chemical formula for carbon dioxide?
CO2
CO
C2O2
Co2
7
What is the chart called that contains all of the elements?
National Geographic Element Table
element chart
periodic table
ACS Chemical Table
8
What important thing did Ernest Rutherford do?
discovered neutrons
discovered electrons
discovered protons
discovered isotopes
9
What is this a picture of?
6 atoms of baking soda
6 molecules of baking soda
1 atom of baking soda
1 molecule of baking soda
10
What 2 elements had not been discovered when Mendeleev made his periodic table so he left spots
aluminum & gallium
gallium & arsenic
germanium & arsenic
gallium & germanium
11
What does an element's atomic number tell you?
The number of neutrons in an atom of that element.
The number of protons in an atom of that element.
The number of neutrons/protons in an atom of that element.
The number of nucleons in an atom of that element.
12
A phosphorous atom has 15 protons, 16 neutrons, and 15 electrons. What is its atomic mass?
30
31
46
15
13
Who developed the modern atomic model?
Alfred P. Neuman
Ernest Rutherford
Max Planc
Niels Bohr
14
What is formed when 2 or more elements are chemically bonded together?
super elements
compounds
solutions
mixtures
15
What important thing did James Chadwick do?
discovered electrons
discovered isotopes
discovered neutrons
discovered protons
16
What is copper made out of?
copper molecules
copper atoms
copper protons
copper ions
17
What are the 3 subatomic particles in the atom of an element called?
protons, neutrons, & electrons
protons, neutrons, & electricity
protons, mesons, electrons
photons, neutrinos, quarks
18
Which scientist determined the atomic numbers of elements & arranged the periodic table by them
Dimitri Mendeleev
Henry Moseley
Sir William Ramsay
Julius Meyer
19
How many electrons does a titanium atom have?
47.867
22
48
26
20
What type of element is bromine (Br)?
metal
rare earth element
metalloid
nonmetal
21
Who is the father of the periodic table?
Dimitri Mendeleev
Isaac Newton
Gregor Mendel
Niels Bohr
22
Why are valence electrons important?
Because they orbit around the nucleus w/ the greatest speed
They R the only part of the atom involved N chemical bonding
Because they are used in nuclear reactions.
Because they are used in calculating the atomic mass.
23
What does an element's atomic mass tell you?
the number of electrons + protons
the number of neutrons + protons
the number of electrons + neutrons
the number of neutrinos + positrons
24
What group is phosphorous in on the periodic table?
Group 15
Group 5
Group 3
Group 16
25
What element contains 47 protons?
molybdenum
tungsten
titanium
silver
26
What is silver made of?
millions of silver compounds
millions of silver atoms
millions of silver molecules
silver and oxygen atoms
27
How many protons does a titanium atom have?
22
26
48
47.867
28
What family is bromine (Br) in?
fluorine family
oxygen family
noble gas family
halogen family
29
What important thing did J. J. Thomson do?
discovered neutron
discovered neutrons
discovered electrons
discovered protons
30
An element has 30 protons, 30 electrons, and 35 neutrons. What is the element's atomic number?
15
30
16
46
31
How many neutrons does a titanium atom have?
47.867
22
48
26
32
What happens to the physical/chemical properties of elements that are chemically bonded 2gether
The chemical properties change but not physical properties.
The physical properties change but not chemical properties.
Both the physical & chemical properties change into new ones
The physical & chemical properties stay the same.
33
What are the building blocks of matter called?
elements
colloids
mixtures
compounds
34
How many electron orbits does a bromine (Br) atom have?
17 orbits
4 orbits
3 orbits
7 orbits
35
What group is bromine (Br) in?
Group 4
Group 3
Group 17
Group 18
36
What are valence electrons?
the electrons in the inner electron orbit
all of the electrons in an atom
the electrons in the middle electron orbit
the electrons in the outer electron orbit
37
What is baking soda made out of?
1 sodium atom 1 hydrogen atom 1 carbon atom 3 oxygen atoms
1 sodium atom 1 hydroxide atom 1 carbon atom 2 oxygen atoms
1 sodium atom 1 hydrogen atom 1 cobalt atom 2 oxygen atoms
1 nitrogen atom 1 hydrogen atom 1 carbon atom 3 oxygen atoms
38
What is the primary difference between a mixture and a compound?
mixtures R physically combined/compounds R chemically combnd
mixtures physical property R different from their components
mixtures are made of elements & compounds are not
their are more compounds in the world than there R mixtures
39
What categories of the periodic table contain elements that have similar chemical/physical prop
zig-zag line
rows
groups
periods
40
What is the smallest part of an element called?
molecule
nucleon
atom
colloid
41
An element has 5 protons, 5 electrons, and 6 neutrons. What is the atomic mass of this element?
11 amu
10 amu
5 amu
16 amu
42
Which number is the subscript? 6H
2
O+6CO
2
-->C
6
H
12
O
6
+ 6O
2
both the 2 and the 12
6 in 6H2O
12 in C6H12O6
2 in CO2
43
How many valence electrons does a bromine atom have?
4 electrons
3 electrons
7 electrons
17 electrons
44
How many valence electrons are in a phosphorous atom?
10 electrons
5 electrons
8 electrons
2 electrons
45
What period on the periodic table is phosphorous in?
Period 10
Period 3
Period 5
Period 15
46
How many protons does a phosphorous atom have?
15 protons
10 protons
2 protons
30 protons
47
What are the nucleons in an atom?
electrons & neutrons
neutrons & protons
electrons & protons
neutrons, protons, & electrons
