Name ______________________________ Date ______________________ Section ____________
Introduction to Classifying Matter
All matter can be classified into two categories: mixtures and pure substances. A
pure substance is a single kind of matter that has a specific chemical composition.
Compounds, which are elements that have been combined in set ratios, are pure
substances. They are represented by chemical formulas. The smallest unit of a
compound is a molecule. Elements, and the atoms that make them up, are
also pure substances. Elements are represented by chemical symbols.
There are two kinds of mixtures: homogeneous and heterogeneous. A
homogeneous mixture is a very well mixed mixture- it has an even composition
throughout. It is difficult to see the different parts and separate them out.
The most well mixed of all mixtures is a solution, like salt water. A
heterogeneous mixture does not have an even composition throughout, it
varies, and you can usually see the different parts. Together,
elements, compounds, and mixtures make up the world around us.
Sort It
Correctly sort the following terms into the categories below.
Air
Carbon dioxide
Nitrogen
Salad
Elements
Coffee
Sand
Gold
Hydrogen peroxide
Salt water
Compounds
Sugar
Trail mix
Homogeneous
Mixtures
Heterogeneous
Mixtures
1.
4.
7
10.
2.
5.
8.
11.
3.
6.
9.
12.
©2015 Adventures in Science
Krypton
Organize It
Complete the concept map about matter. Use the words in bold in the introduction on the first page.
Matter
Pure
17. Substances
13. Mixtures
Heterogeneous
15. Mixture
14.
18.Elements
the smallest
unit of all
the most well
mixed of all
16.
combine to
form
Solution
19.
Atoms
20.
the smallest
unit is one
can form
21.Molecules
Multiple Choice
Circle the letter of the best answer.
22. Sodium and chlorine combine to form sodium
chloride (NaCl) or common table salt. Salt is
classified as which of the following?
a. An element
b. A mixture
c. A compound
d. An atom
24. Bismuth (Bi), oxygen (O2), water (H2O), and
ammonia (NH3) are all examples of pure
substances. Which of the following statements
describes all pure substances?
a. They can only be compounds
b. They cannot be broken down into simpler
substances
c. They consist of only one type of element
d. They have a definite chemical composition
23. Titanium (Ti) is classified as an element. The
smallest unit of an element that can be
classified as an element is
a. a molecule.
b. an atom.
c. a compound.
d. a proton.
25. Which of the following examples is a homogenous
mixture and NOT a compound?
a. Salt water
b. Glucose
c. Acetic acid
d. Calcium carbonate
©2015 Adventures in Science
Answers
Name ______________________________
Date ______________________ Section ____________
Introduction to Classifying Matter
All matter can be classified into two categories: mixtures and pure substances. A
pure substance is a single kind of matter that has a specific chemical composition.
Compounds, which are elements that have been combined in set ratios, are pure
substances. They are represented by chemical formulas. The smallest unit of a
compound is a molecule. Elements, and the atoms that make them up, are
also pure substances. Elements are represented by chemical symbols.
There are two kinds of mixtures: homogeneous and heterogeneous. A
homogeneous mixture is a very well mixed mixture- it has an even composition
throughout. It is difficult to see the different parts and separate them out.
The most well mixed of all mixtures is a solution, like salt water. A
heterogeneous mixture does not have an even composition throughout, it
varies, and you can usually see the different parts. Together,
elements, compounds, and mixtures make up the world around us.
Sort It
Correctly sort the following terms into the categories below.
Air
Carbon dioxide
Nitrogen
Salad
Elements
Coffee
Sand
Gold
Hydrogen peroxide
Salt water
Compounds
Sugar
Krypton
Trail mix
Homogeneous
Mixtures
Heterogeneous
Mixtures
1.
Gold
4.
Carbon
dioxide
7
Air
10.
Salad
2.
Krypton
5.
Hydrogen
peroxide
8.
Coffee
11.
Sand
3.
Nitrogen
6.
Sugar
9.
Salt water
12.
Trail mix
©2015 Adventures in Science
Organize It
Complete the concept map about matter. Use the words in bold in the introduction on the first page.
Matter
Pure
17. Substances
13. Mixtures
Homogeneous
14. Mixture
Heterogeneous
15. Mixture
18. Elements
the smallest
unit of all
the most well
mixed of all
16.
combine to
form
Solution
19.
Atoms
20. Compounds
the smallest
unit is one
can form
21. Molecule
Multiple Choice
Circle the letter of the best answer.
22. Sodium and chlorine combine to form sodium
chloride (NaCl) or common table salt. Salt is
classified as which of the following?
a. An element
b. A mixture
c. A compound
d. An atom
24. Bismuth (Bi), oxygen (O2), water (H2O), and
ammonia (NH3) are all examples of pure
substances. Which of the following statements
describes all pure substances?
a. They can only be compounds
b. They cannot be broken down into simpler
substances
c. They consist of only one type of element
d. They have a definite chemical composition
23. Titanium (Ti) is classified as an element. The
smallest unit of an element that can be
classified as an element is
a. a molecule.
b. an atom.
c. a compound.
d. a proton.
25. Which of the following examples is a homogenous
mixture and NOT a compound?
a. Salt water
b. Glucose
c. Acetic acid
d. Calcium carbonate
©2015 Adventures in Science
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