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WorksheetsChemistry Regent - June 2013 Q1-10
Total questions: 10
Worksheet time: 5mins
Name
Class
Date
1.
According to the wave-mechanical model of the atom, an orbital is a region of the most probable location of
a)
an alpha particle
b)
a gamma ray
c)
an electron
d)
a proton
2.
Which particles have approximately the same mass?
a)
an electron and an alpha particle
b)
an electron and a proton
c)
a neutron and an alpha particle
d)
a neutron and a proton
3.
During a flame test, a lithium salt produces a characteristic red flame. This red color is produced when electrons in excited lithium atoms
a)
are lost by the atoms
b)
are gained by the atoms
c)
return to lower energy states within the atoms
d)
move to higher energy states within the atoms
4.
Compared to the energy and charge of the electrons in the first shell of a Be atom, the electrons in the second shell of this atom have
a)
less energy and the same charge
b)
less energy and a different charge
c)
more energy and the same charge
d)
more energy and a different charge
5.
Which quantity can vary among atoms of the same element?
a)
mass number
b)
atomic number
c)
number of protons
d)
number of electrons
6.
Which substances have atoms of the same element but different molecular structures?
a)
He(g) and Ne(g)
b)
O2(g) and O3(g
c)
K(s) and Na(s)
d)
P4(s) and S8(s)
7.
An atom that has 13 protons and 15 neutrons is an isotope of the element
a)
nickel
b)
silicon
c)
aluminum
d)
phosphorus
8.
Which elements have the most similar chemical properties?
a)
Si, As, and Te
b)
N2, O2, and F2
c)
Mg, Sr, and Ba
d)
Ca, Cs, and Cu
9.
Which list includes three types of chemical formulas for organic compounds?
a)
covalent, metallic, isotopic
b)
covalent, metallic, molecular
c)
empirical, structural, isotopic
d)
empirical, structural, molecular
10.
In a bond between an atom of carbon and an atom of fluorine, the fluorine atom has a
a)
weaker attraction for electrons
b)
stronger attraction for electrons
c)
smaller number of first-shell electrons
d)
larger number of first-shell electrons
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