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Chapter 3 and 4 for final


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The primary substances of which all other things are composed are
The elements in each group have similar chemical properties is characteristic of:
Periodic table
The group 8A elements
Are unreactive and are rarely found in combination with other elements.
Low melting pooits are characteristic of
non metal
The smallest partical of an element that retains the characteristics of the element is an
A proton has a positive charge and a mass of approximately 1 amu are descriptions of
a subatomic particle
The atomic number of an atom is equal to the number of
The mass number of an atom can be calculated form
the number of protons plus neutrons
Consider a neutral atome wiht 30 protons and 34 neutrons. The number of electrons in this atom is
Consider an isotope of sodium with a mass number of 25. The number of neutrons in this isotope of sodium is
Isotopes are atoms of the same element that have
the same atomic number but different numbers of neutrons.
The atomic mass of an element is equal to
the mass of an average atom.
13N, 14N and 15N They all have
isotopes, 7 protons, 7 electron and same atomic number.
The electron arrangemet of any particular atom shows
The number of electrons in each shell.
Semiconductors are located in the periodic table on the
line dividing metals from nonmetasl in the table.
What is sulfur a metal or non metal?
Non metal
Whas is chromuim metal or non metal?
The number of valence electrons found in an atome of group A element is equal to
its group number.
In an electron dot structrure of an element, the dots are used to represent
The valence electrons.
The number of dots in the electron dot structure of nitroge is
The number of dots in the electron dot structure of carbon is
The octet rule indicates that
atoms lose, gain, or share valence electrons to have 8 valence electrons
How many electrons will aluminium gain or lose when it forms an ion?
lose 3
To form an ion, a sodium atom
loses one electron.
What is the ionic charge of an ion with 18 protons and 15 electrons?
Elements in group 2 of the periodic table form ions with a charge of
How many electrons will chlorine gain or lose when it forms an ion?
gain 1
The correct formula for a compound formed from the elements Al and O is
Which one of the following compounds contains an ion with a 3+ charge?
The compound MgCl2 is named
Magnesium chloride
What is the correct formula for the iron (II) ion?
What is the correct formula for iron (III) sulfide?
In a molecule with covalent bonding,
atoms are held together by sharing electrons.
In a covalent bonded molecule, the number of electrons that an atom shares with others is usually equal to the number of electrons
needed to give it a noble gas arrangement.
the formula for a molecule formed from N and Cl would be
The correct name for the compound N2O3 is
Dinitrogen trioxide.
The name of Al2(SO4)3 is
Aluminum sulfate
N2 contains a
Nonpolar covalent bond.
CaO contains an
ionic bond.
H2O is a
polar covalent bond
A group of covalently bonded atoms that has an overall electrical charge is called
Polyatomic ion.
Phosphate has how many ionic charge?
3-ionic charge
What is the formula of Na+ and PO3-/4 ions?
What is the formula for aluminium nitrate?
The shape of the ammonia molecule (NH3) is
Carbon Tetrachlorid -Idetify as covalent or ionic
Potassium oxide - Idetify as covalent or ionic
Hydrogen sulfide - Idetify as covalent or ionic
Sodium fluoride - Idetify as covalent or ionic
SO 2-/4
NO -2
Valence for O
N and F are
polar covalent
H and F
Polar covalent
Magnesium hydrogen sulfite
magnesium sulfide
What is the mass of 2.00 L of an intravenous glucose solution with a density of 1.15 g/ml?
2.30 Kg
The ration of the mass of a substance to its volume is its?
is often used to determine an individuals percentage of body fat
A 50.0 Ml urine sample has a mass of 50.7 g. The specific gravity of the urine is
Argon is
noble gas
In an atome, the nucleus contains
All the protons and neutrons.
The elements lithium, sodium, and potassium
are in the same group
The number of valence electrons found in an atom of a group a elemnet is equal to
its group number.
In ionic compounds,_________lose their valence electrons to form pos. charged______________
An anion always
Has negative charge

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