Worksheet #2 – Classification of Matter II Answers
Name: _________________________
Period:_________
Part A: Classification of Matters
1. Fill in the Blanks
A(n) ____________ is a pure substance that is made of only one kind of atom.
The symbol for a(n) ____________ is always one or two letters. When the symbol
contains two letters, the first letter is always ____________, and the second
letter is always ____________.
A(n) ____________ is a pure substance containing two or more elements that are
____________ combined. A(n) ____________ is represented by a chemical
____________. The elements in a(n) ____________ always combine in
____________ proportions.
A(n) ____________ is made of two or more substances that are ____________
combined. A(n) ____________ that is uniformly mixed is called ____________.
A special name for this is a(n) ____________. A(n) ____________ that is not
uniformly mixed is called ____________. A special type of mixture that is a solid
____________ of two or more metals is called a(n) ____________.
2. Identify each of the common items below as an element, a compound or a mixture. Their
chemical formulas have been given to help you out.
a. Sugar (C6H12O6)
b. Phosphorous (P4)
c. Battery Acid (H2SO4)
d. Air (N2 & O2 & CO2 …)
h. Granite (SiO2 & KAlSi3O3 &
K3Si3O10)
i. Drain Cleaner (Al & NaOH
& …)
e. Oxygen (O2)
j. Sodium (Na)
f. Milk (C6H12O6 & H2O &
k. Water (H2O)
C50H102O3)
g. Gold (Au)
l. Salt Water (NaCl & H2O)
3. Which one the following is NOT a true statement?
a. Two or more atoms held together with bonds make up a molecule.
b. Pure substances are made of only one type of atom.
c. At least two types of atoms are required to make a compound.
d. Mixtures can be made of two elements, two components and an element &
compound.
4. In a sugar molecule (C6H12O6):
a. How many types of atoms are present?
b. How many atoms are present?
5. In granite, there are two components (KAlSi3O3 & K3Si3O10) present. Are those two
elements or compounds? Are they the same? Explain.
Part B: Chemical and Physical Properties
Classify each of properties listed below as PP (Physical Property), PC (Physical Change), CP (Chemical
Property), CC (Chemical Change)
1.
Color
_______________
10.
reactivity
____________________
2.
Combustibility _________
11.
Unreactive
____________________
3.
Hardness
12.
Odor
____________________
4.
Density________________
13.
stability ____________________
5.
Mass
6.
Melting point
_________
15.
Tendency to corrode _______________
7.
Ductility_______________
16.
reacts with water
8.
Volume________________
17.
Weight
____________________
9.
rusting _______________
18.
solubility
____________________
__________
________________ 14.
Malleability
____________________
________________
Go back to the list above (1-18) and indicate whether Intensive (I) or Extensive (E)
Some of the measured properties of a given substance are listed below. Write the general name
describing each property. Select the names from the following properties: chemical, malleability,
density, volume, hardness, melting point, ductility, mass, odor, weight, combustibility.
19.
15 dm3 ____________________
20.
Can easily be hammered into sheets
21.
2.8 g/cm3
22.
Burns when heated in the presence of O2.
23.
Stinks when heated
24.
500 oC
25.
Can easily be drawn into a wire ____________________
____________________
____________________
____________________
____________________
____________________
Classify the following properties as extensive or intensive.
26.
mass _____________
27. ductility _________28. melting point _____________
29.
color ____________30. length ____________31. conductivity _____________
Chemical and Physical Changes
1. Classify each of the following as chemical or physical changes:
a. growth of a plant
_________________________________
b. fading of dye in cloth
_________________________________
c. melting of ice
_________________________________
d. digestion of food
_________________________________
e. formation of
_________________________________
f. heating of a wood
_________________________________
g. making a rock candy by evaporating water from sugar
solution
_________________________________
h. production of light by an electric arc
_________________________________
i. burning of a coal
_________________________________
j. tearing of a piece of paper
_________________________________
k. kicking of a football
_________________________________
l. excavating of a soli
_________________________________
m. exploding of a firecracker
_________________________________
2. Which of the following involve a change in state of a substance?
a. grinding beef into hamburgers
____________________________
b. soldering wires on a computer circuit board by melting solder _________________
c. pouring milk into a glass
_________________________________
d. allowing soup to cool in a bowl
_________________________________
3. Classify the following properties as chemical or physical.
a. heat conductivity _______________
e. length ________________
b. combustible ___________________
f. brittleness _____________
c. acid resistant __________________
d. displaces hydrogen from water ________________