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Chemistry Part 1
Chemistry Part 1
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7th Grade Science - States of Matter, Atomic Structure, Periodic Table, Metals and Nonmetals
Flashcards
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Questions
25
Answers
1
As we move from left to right, across the row, the elements
change from nonmetals to metals.
start as gases but end as solids.
change from metals to nonmetals.
show a decrease in atomic mass number.
2
Which of these period 3 elements would you predict to be the MOST metallic?
Al
Ar
Si
Cl
3
What is the atomic number of this element?
52
15
17
35
4
If heat is absorbed by water, what phase change occurs?
solid to liquid
gas to solid
liquid to gas
liquid to solid
5
Which element(s) are most likely to conduct electricity?
lithium and beryllium
lithium
fluorine and neon
boron and carbon
6
Which element is an example of a metalloid?
gold
helium
iron
silicon
7
Because they are in the same family, what can you predict about these elements?
They are chemically reactive in a similar way.
They change from metals to nonmetals as go down the column.
The size of the atom decreases as you go down the column.
They are all about the same mass.
8
What is the name of the atom shown?
helium
beryllium
fluorine
boron
9
As we move to the far right, the purple column is made up of _________ that are __________.
metals; nonreactive
gases; highly reactive
metalloids; reactive
gases; nonreactive
10
What are the chemical symbols for the elements
calcium, carbon, and chlorine
respectively?
Ca, C, and Cl
Ca, Co, and Cl
C, Ca, and Co
Cl, C, and Ce
11
Elements in the same group/family of the periodic table are similar in what way?
They are all nonmetals
They are all metals
They have a full outer shell of electrons.
They have the same number of valence electrons.
12
Which sub-atomic particle is positively charged and found in the nucleus?
neutron
proton
beta particle
electron
13
If heat is released from water, what phase change occurs?
gas to solid
liquid to solid
solid to liquid
solid to gas
14
What is the identity of the atom shown?
potassium
neon
fluorine
nitrogen
15
Describe the location of non-metals on the periodic table?
middle
lower left corner
upper left corner
upper right corner
16
If heat is released from water vapor, what phase change occurs?
liquid to solid
liquid to gas
gas to liquid
solid to gas
17
Consider the element sodium. It's atomic number is __________ and equals ___________.
11; the number of protons
12; the number of neutrons
23; the sum of protons and neutrons
23; the number of electrons
18
Which pair of elements are more similar chemically Na and Mg or F and Br? And why?
Na and Mg, because they are in the same group.
Na and Mg, because they are in the same period.
F and Br, because they are in the same group.
F and Br, because they are in the same period.
19
What are the chemical symbols for the elements:
sodium, sulfur,
and
silicon
respectively?
S, Na, and So
Na, Sr, and Si
S, Na, and Si
Na, S, and Si
20
What property do the elements of the noble gas family all share?
They are very reactive.
They are found in the earth's atmosphere.
They react readily with oxygen in the air.
They are not reactive.
21
What is the chemical symbol for sodium?
S
So
Na
NA
22
Which subatomic particle is NOT found at the center of the atom?
proton
electron
neutron
nucleus
23
The atomic number of magnesium is 12. This means that its nucleus must contain
6 protons and 6 neutrons.
12 neutrons and no protons.
12 protons and no electrons.
6 neutrons and 6 electrons.
24
Using your knowledge of the periodic tabe,which of these statements is correct about nitrogen?
Nitrogen atom has more protons than a Fluorine anion.
All Nitrogen atoms have 7 protons.
The mass number of Nitrogen is 21.
All Nitrogen atoms have 14 protons.
25
If heat is absorbed by ice, what phase change occurs?
solid to liquid
liquid to solid
gas to solid
liquid to gas
