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Science Exam 4

Terms in this set (44)

The atomic number of an element in the number of
protons
Protons are so much more massive than electrons that you can neglect the mass of electrons when determining the mass of an atom.
True
Isotopes of an element are atoms that have
the same number of protons, but a different number of neutrons
the atomic weight of neon is 20.2. this means
Incorrect: all atoms of neon have a mass of 20.2 u relative to carbon 12
uranium has
incorrect: 143 protons, 143 neurons and 92 electrons
Rutherford concluded from his calculations that the volume of an atom
is mostly empty space
the most important factor in the chemical behavior of an atom is the
electron structure
on the periodic table, identify the period for the element strontium
5
on the periodic table, identify the group for the element strontium
2A
match the element with the correct number of valance electrons
arsenic
rubidium
5
1
match the element with the correct number of dots when it is written in lewis dot notation
boron
radon
3
8
identify the charge of the following ions
barium
iodine
+2
-1
use the periodic table to identify if calcium is a metal nonmetal or semi conductor
metal
the element fluorine belongs to which group
halogens
how many atoms are in a molecule of chalk
5
when atoms of non metallic elements react with one another they tend to seek stability by
incorrect: forming ionic bonds
atoms that have eight valance electrons will tend to
be stable
an atom becomes a positive ion by losing an electron
true
the formation of an ionic bond
all are correct
when each atom contributes two electrons to the shared pair, the result is a
double bond
group VIIA elements would form ionic bonds with elements from
group IIA
match the description with the correct type of chemical bond
electrostatic attraction between atoms
unequal sharing of electrons
may form single, double, or triple bonds
metal plus non metal
...
should dihydrogen monoxide which is responsible for substantial damage to the environment be banned
no it is too helpful
potassium is a metal and oxygen is a non metal
each potassium atom lost one electron
in an ionic compound the metal
is written first
the "fictional" element N would hypothetically would form a stable ionic compound NCl^2
NBr^2
what is the correct name for the ionic compound CaF2
calcium fluoride
if iron (II) chromate has a formula of
-2
the correct name for the compound N204
dinitrogen tetroxide
write the name of the following covalent compound As2S5
arsenic pentasulfide
which of the following represents an empirical formula
II (or III) only
what is the formula weight of propane
44 u
what is the total mass of products in this combination reaction
80 u
what is the mass percent of sodium in washing soda
62.1%
in a chemical equation the products are found on the left side of the arrow
false
what is the total number of atoms in calcium phosphate
13
what is the number of oxygen atoms in
12
what statements are true of all combustion reactions
Incorrect: I and II
the reaction: 2NaI + Cl2 -> 2NaCl + I2 is an example of
incorrect: ion exchange also called double replacement
something
...
name the type of chemical reaction represented
combination also called synthesis
the mass of oxygen and two moles of CO2 is
64
when the equation
7
list the
1, 3, 3, 1
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