Worksheet #2 – Classification of Matter II
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 …)
e. Oxygen (O2)
f. Milk (C6H12O6 & H2O & C50H102O3)
g. Gold (Au)
h. Granite (SiO2 & KAlSi3O3 & K3Si3O10)
i. Drain Cleaner (Al & NaOH & …)
j. Sodium (Na)
k. Water (H2O)
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 ______14. Malleability ______
6. Melting point ______15. Tendency to corrode ______
7. Ductility______16. reacts with water ______
8. Volume______17. Weight ______
9. rusting ______18. solubility ______
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 ______