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Intro To Chemistry
Test Description: Review of the properties and structure of atoms, the Periodic Table of Elements, Ions Isotopes and simple formulas
Instructions: Answer all questions to get your test result.
1) Mendeleev created the first periodic table by arranging elements in order of
A
decreasing atomic mass
B
increasing melting points and densities
C
increasing atomic number
D
increasing atomic mass
2) The atomic number of an element is based on the
A
number of protons in its nucleus
B
number of neutrons in its nucleus
C
number of electrons around its core
D
mass of its nucleus
3) From an element's location in the periodic table, you can predict
A
its properties
B
its chemical symbol
C
its chemical name
D
when it was discovered
4) The two most common alkaline earth metals are
A
Calcium and magnesium
B
iron and silver
C
sodium and potassium
D
copper and zinc
5) At room temperature, more than half of the nonmetal elements are
A
gases
B
liquids
C
alloys
D
solids
6) The elements that do not ordinarily form compounds are
A
halogens
B
Noble gases
C
elements in the carbon family
D
metals
7) Which is a property shared by most molecular compounds?
A
nonpolar bonds
B
high boiling point
C
low melting point
D
high melting point
8) When an atom loses an electron, it becomes a
A
neutral ion
B
positive ion
C
neutral atom
D
negative ion
9) Magnesium bromide is an ionic compound with the chemical formula MgBr2. (the 2 should be a subscript) What does the '2' tell you?
A
Bromide has a +2 charge
B
Bromide has a -2 charge
C
There are two bromide ions for every magnesium ion
D
There are two magnesium ions to every bromide ion
10) In the chemical formula for an ionic compound, which item is written first?
A
the name of the negative ion
B
the subscripts
C
the charges
D
The name of the positive ion
11) The chemical name for the compound with the formula Na2S is (the 2 is a subscript)
A
sodium sulfide
B
lithium oxide
C
magnesium sulfide
D
sodium flouride
12) What is a double bond
A
one pair of electrons shared between two atoms
B
two pairs of electrons shared between four atoms
C
a bond between two atoms
D
two pairs of electrons shared between two atoms
13) Electrons involved in bonding between atoms are
A
closest to the nucleus
B
positively charged
C
valence electrons
D
inside the nucleus
14) What are two ways that a proton and a neutron are similar?
A
They are located in the nucleus and have an atomic mass of 1
B
They are located in the nucleus and have an atomic mass of 0
C
They are located in the nucleus and have a charge of +1
D
They are located in the nucleus and have a charge of zero
15) How is it possible for an atom to have no charge even though it is made up of protons, neutrons and electrons?
A
None of these answers
B
The number of protons and neutrons are equal, so the charge is equal
C
The number of protons and electrons are equal, therefore the charge is equal
D
The number of electrons and neutrons are equal, so the charge is zero
16) Why is it UNnecessary to include the electrons when determining the mass of an atom?
A
An electron has a negative charge
B
The mass of the electrons is so large that it can't be added
C
The electrons are not located in the nucleus, so they don't count
D
The mass of the electron is so small that it wouldn't change the mass
*select an answer for all questions
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