Name: __________________________
Chapter 10 Lesson 1: Classifying Matter (Pages 348–355)
7th Grade Science – Mrs. Stabler &Ms. Fasano
Date: _____________ Period: ______
Understanding Matter
1. What is matter? anything that has mass and takes up space.
2. With your group: Make a list of 10 examples of matter here in our classroom
Desk, table, air, chair, smartboard, computer, pens, binder, books, closets
3. An atom is a small particle that is a building block of matter.
Atoms
4. Parts of the atom:

The nucleus is the center of the atom.

Protons have a positive charge,

Neutrons have no charge or a neutral
charge.

Protons and neutrons make up the
Nucleus

Negatively charged Electrons move quickly
throughout the area around the nucleus called the
electron cloud
5. Not all atoms have the same number of
protons, neutrons, and electrons. Atoms that have different numbers of
protons differ in their properties.
Substances
6. Atoms can combine and arrange in millions of different ways.
7. What are the two main classifications of matter? Substances and mixtures
8. What is a substance? matter with a composition that is always the same.
9. With your group: Make a list of 10 substances. Oxygen, water, glucose,
iron, silver, gold, helium, hydrogen, zinc, boron
10. What is an element? a substance that consists of just one type of atom.
11. Because there are about 115 different types of elements, there are about
115 different types of atoms.
12. Whether the atoms of an element exist individually or in groups, each
element contains only one type of atom. Therefore, its composition is always
the same.
13. How do atoms of different elements differ?
Each type of atom contains a different number of protons in its nucleus.
The number of protons in an atom is the atomic number of the element.
14. What is a compound? type of substance containing atoms of two or
more different elements chemically bonded together.
15. The combination of symbols and numbers that represents a compound is
called a chemical formula.
16. If a substance contains only one type of atom it is an element. If it
contains more than one type of atom, it is a compound.
17. A compound often has different properties from the individual elements
that compose it.
Mixtures
18. What is a mixture? matter that can vary in composition.
19. Mixtures are combinations of two or more substances that are physically
blended together.
20. Do mixtures always have the same amounts of substances? No they vary
from mixture to mixture
21. What is a heterogeneous mixture? a type of mixture in which the
individual substances are not evenly mixed.
22. What is a homogeneous mixture? a type of mixture in which the
individual substances are evenly mixed.
23. Examples of heterogeneous mixtures and homogeneous mixtures.
Heterogeneous:
hamburger
salad
Homogeneous:
sandwich
soda
iced tea
lemonade
24. What does it mean to dissolve? means to form a solution by mixing
evenly.
25. A homogeneous mixture is also known as a solution
26. How do mixtures differ from substances? Mixtures are a physical
combination of one or more substances
Compounds vs. Solutions
27. Why can a chemical formula be used to describe a compound, but not a
mixture? A compound’s composition does not vary because it is combined
chemically, whereas a mixture’s composition can vary.
Multiple Choice
Which term describes matter that can vary?
a. atom
c. mixture
b. element
d. substance
What is the combination of symbols and numbers that represent a compound?
a. atomic number
c. mixture
b. chemical formula
d. substance
Which term refers to a type of substance containing atoms of two or more
different elements chemically bonded together?
a. homogeneous mixture
c. chemical formula
b. heterogeneous mixture
d. compound
Agree/Disagree
1.The atoms in all objects are the same. False, they differ in the number of
protons, neutrons, and electrons
2. You cannot always tell by an objects appearance whether it is made of more
than one type of atom. True, you would have to look at the chemical
makeup or composition. (chemical formula)