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Periodic table, Element properties, and lab safety - 7th grade science Flashcards | StudBud
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Periodic table, Element properties, and lab safety - 7th grade science
Periodic table, Element properties, and lab safety - 7th grade science
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1
A positively charged ____ has more protons than electrons
neutron
ion
molecule
isotope
2
According to its number of valence electrons, Phosphorus would have an oxidation number of
+3, -3
5
-3
+3
3
From an elements location on the periodic table, you can predict
its chemical symbols
its chemical name
its properties
when ir was discovered
4
An element has 2 valence electrons in a shell holding 8, would it give away or take on electrons to acheive a full shell
both
neither
take on
give away
5
Which brach of science includes the study of the stars
physical science
life science
scientific literacy
earth and space sciene
6
If you were to round off the measurement 2.33501 grams to three digits, you would get ____.
2.34 grams
2.35 grams
2.36 grams
2.33 grams
7
A coefficient shows
how many molecules ther are
the number of valence electrons
how many elements in a molecule
the layout of a molecule
8
The measurement of how much mass is contained in a given volume is called
melting point
weight
density
boiling point
9
When you measure something in meters cubed, you are measuring
mass
length
volume
area
10
Mendeleev created the first periodic table by arranging elements in order of
decreasing atomic mass
increasing atomic number
increasing atomic mass
increasing melting points and densities
11
The elements that do not ordinarily form compounds are
elements in the carbon family
halogens
metals
noble gases
12
How many atoms of sodium are in the molecule NaOH
0
1
2
3
13
All elements are composed of extremely small particles called
molecules
atoms
compounds
mixtures
14
What is the first thing you should do if an accident occurs
find the emergency equipment
notify your teacher
start first aid
go to the nearest hospital
15
Copper wire is matter that is comprimised of only one
mixture
element
plasma
compound
16
Which of these contains the most elements
nonmetals
metalloids
metals
transition elements
17
The measurement of how much matter an object contains is its
weight
melting point
mass
volume
18
A parenthesisd around part of a compound, like Ca(OH)
2
add
subtract
multiply
hide
19
Flourine, chlorine, bromine, iodine, are part of a family called
noble gases
metalloids
alkali metals
halogens
20
Mass and weight are different because
weight depends on the force of gravity
mass does not depend on the amount of matter an object contains
mass depends on the force of gravity
Weight depends on the amount of matter an object contains
21
Which of these staements about a column of the periodic table is true
The elements have a wide range of properties
the elements have similar properties
the elements have the same atomic number
the elements have the same atomic mass
22
How many molecules of 3MaCl are present
3
5
4
1
23
Which branch of science includes the study of plants, animals, and the human body
scientific literacy
earth and space science
physical science
life science
24
The elements in a column (family) of the periodic table
are in the same period
have similar properties
have a very similar chemical symbols
have the same atomic mass
25
In the periodic table, the most reactive metals are found
in Period 6 and 7 at the bottom
in Period 1, the first row across the top
in Group 1, the first column on the left
in Groups 13-16 in the center
26
Which branch of science includes the study of magnetism
earth and space science
scientific literacy
life science
physical science
27
Because atoms are so small
they cannot be made of smaller particles
they cannot be synthesized by scientists
there is no way to describe them
scientists create models to describe them
28
The most important lab safety rule is
design & conduct your own experiments without asking your teacher
always wear safety goggles
always follow your teachers instructions & textbook directions exactly
always wear a lab apron
29
If it has an atomic number of 17 and a mass number of 35, how many valence electrons does Chlorine have?
8
7
17
35
30
___ are particles without electronic charge in the atom's nucleus
ions
protons
neutrons
electrons
31
The simplest pure substances are called
mixtures
elements
matter
compounds
32
The volume of an irregular object can be measured by
submerging the object in water in a graduated cylinder
dividing the object's desity by its mass
placing the object on a triple-beam balance
multiplying the onject's length, width, and height
33
The subscript tells
how many times we write an element
how many molecules there are
how many atoms of an element there are in a molecule
how strong an element is
34
Which group of elements shares characteristics with both metals and nonmetals
alloys
metalloids
halogens
salts
35
what information in the periodic table indicates the number of protons in an atom
the element's atomic mass
the element's chemical symbol
the element's atomic number
the position of the lement in its column
36
The density of a block of wood with a volume of 50 cubic centimeters and a mass of 100 grams is
500 g/cm3
0.5 g/cm3
5,000 g/cm3
2 g/cm3
37
Neutrons add only ____ to an atom
positive charges
mass
ions
negative charges
38
In an atom, the number or protons equals the number of
isotopes
nuclei
neutrons
electrons
39
Science and technology are
completely unrelated
dependent on each other
not important
the same thing
40
In the laboratory, volumes of liquid are usually measured with a(n)
graduated cylinder
triple-beam balance
scale
electrode
