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WorksheetsComposition of Molecules Review
Total questions: 35
Worksheet time: 49mins
Which of these are pure substances?
Diagram I only
Diagram III only
Diagrams II and IV
Diagrams I and III
Diagram I represents:
an element
a compound
a mixture
Diagram III represents:
an element
a compound
a mixture
The particles in Diagram II are:
atoms only
molecules only
atoms and molecules
The particles in Diagram III are:
atoms only
molecules only
atoms and molecules
The particles in Diagram I are:
atoms only
molecules only
atoms and molecules
The three particles shown here are examples of:
atoms of an element
atoms of a compound
molecules of an element
molecules of a compound
The ten particles shown here are examples of:
atoms of an element
atoms of a compound
molecules of an element
molecules of a compound
Look at your periodic table.
What is the chemical symbol of the element with the atomic number 11?
(a)
Look at your periodic table.
What is the chemical symbol of the element with the atomic number 35?
(a)
Look at your periodic table.
Which Group contains the elements C, Si, and Ge?
(Just write the number of the Group.)
(a)
Look at your periodic table.
Which Group contains the elements Cr, Mo, and W?
(Just write the number of the Group.)
(a)
Look at your periodic table.
In Group 2, what is the atomic number of the element with the chemical symbol Sr?
(a)
Look at your periodic table.
In Group 2, what is the atomic number of the element with the chemical symbol Be?
(a)
Which of these is the chemical symbol of a diatomic element?
F
Fe
C
B
Which of these is the name of a diatomic element?
nitrogen
carbon
helium
beryllium
Which of these is the chemical symbol of a noble gas element?
He
H
N
Al
What is the total number of atoms in one molecule of the compound C2H4O2 ?
2
4
3
8
How many elements are found in the compound with the chemical formula Na2CO3 ?
1
2
3
6
How many oxygen (O) atoms are found in one molecule of Cu3(PO4)2 ?
2
4
6
8
Look at your periodic table.
The name of the element with the atomic number 47 is:
Ag
silver
Group 11
titanium
In this model, each ball represents an atom.
How many atoms make up one of these molecules?
3
6
10
1
What is the chemical formula for the molecule shown here?
NH
HN3
NH3
N3H3
What type of pure substance is pictured here?
crystal compound
polymer compound
element with extended structure
diatomic element
Which type of pure substance is made up of atoms that do not like to bond with any other atoms?
noble gas
diatomic element
polymer compound
crystal compound
Which type of pure substance is made up of pairs of identical atoms bonded together?
noble gas
diatomic element
polymer compound
crystal compound
Which state of matter would a bulk substance with this composition probably be found in?
solid
liquid
gas
Which state of matter would a bulk substance with this composition probably be found in?
solid
liquid
gas
How are crystals and polymers similar? (Check ALL correct answers.)
they both have extended structures
they are only made of one type of element
they are not made of a set number of atoms
they both grow in every direction
Which of these could be the chemical symbol of a single imaginary element?
(Imaginary! None of them can be found on the periodic table.)
GK
gk
Gk
gK
Check ALL the statements that are true.
Crystals structures extend in all three dimensions.
Crystal structures extend in chains.
Polymer structures extend in all three dimensions.
Polymer structures extend in chains.
What type of pure substance is pictured here?
crystal compound
polymer compound
element with extended structure
diatomic element
What state of matter is a material with this structure likely to be found in under normal conditions?
solid
liquid
gas
What state of matter is a material with this structure likely to be found in under normal conditions?
solid
liquid
gas
Why does solid water (ice) have a lower density than liquid water?
Ice has a polymer structure that spaces the particles out.
Ice has a crystal structure that spaces the particles out.
The particles in ice are moving faster than the particles in water.
When ice melts, its particles get farther apart.
