Grade 8 Integrated Science Chapter 10 Lesson 1 on substances and mixtures. Understanding pure substances and homogeneous and heterogeneous mixtures. Identifying substances from mixtures.

1. Chapter 10 Lesson 1: Substances and Mixtures – p. 334-340 – page 1
Vocabulary
• Substance (336) – matter that is always made up of the same combination of atoms
• Mixture (336) – two or more substances that are physically blended but are not chemically
bonded together
• Heterogeneous mixture (337) – a mixture in which substances are not evenly mixed
• Homogeneous mixture (337) – a mixture in which two or more substances are evenly mixed
• Solution (337) – another name for a homogeneous mixture
Substances
• A _______________is matter that is always made up of the same combination of atom.
• There are 2 types of substances
– Elements*
• *Only made up of ___________atom
– Compounds
• A compound is matter made of atoms of 2 or more elements ______________ bonded
together
• Because the ______________________ of elements and compounds do not change, all
elements and compounds are substances
Mixture
•
A ___________________is two or more substances that are physically blended but are not
chemically bonded together.
– *The amount of each substance in a mixture can___________. (Unlike atoms in a
compound)
Mixtures
• Granite
o A type of ___________________
o Composition of different rocks
• Air
o
o
o
o
Doesn’t look like a mixture
78% ________________
21% oxygen
1% other substances

2. Chapter 10 Lesson 1: Substances and Mixtures – p. 334-340 – page 2

3. Chapter 10 Lesson 1: Substances and Mixtures – p. 334-340 – page 3
2 Types of Mixtures
•Heterogeneous Mixture
o Heterogeneous = __________________________________
•Homogeneous Mixture – Solutions
o Homogeneous = _________________________________________
Heterogeneous Mixture
• A heterogeneous mixture is a mixture in which substances are not
evenly___________________.
– Example:
• _____________________is a heterogeneous mixture. It is not evenly mixed.
• Often, you can see the different substances and parts of a heterogeneous mixture with
_______________________ eyes, but sometimes you need a microscope.
– Example:
• ___________________ is a heterogeneous mixture.
• It looks evenly mixed, but with a ________________________ you can easily see areas
with more of one component and less of another.
• Heterogeneous mixture can be hard to tell.

4. Chapter 10 Lesson 1: Substances and Mixtures – p. 334-340 – page 4
Which of the following diagrams shows a
Solution – Homogeneous Mixtures
heterogeneous mixture?
•Many _________________look evenly mixed even when you view them with a powerful
microscope.
•These mixtures are ___________________
•A homogeneous mixture is a mixture in which two or more
substances are ________________________on the atomic level but
not bonded together.
•The mixture looks evenly mixed because the individual atoms and
compounds are too ________________ to see
Solution
•*Another name for a homogeneous mixture is a______________________________.
• Air is a solution. Soda is also a solution.
o Heterogeneous mixture can be hard to_____________________.

5. Chapter 10 Lesson 1: Substances and Mixtures – p. 334-340 – page 5
How do compounds and mixtures differ?
•
There are 2 important differences between compounds and mixtures
– Substances in a _______________________keep their
_______________________because they are not chemically changed
• Salt water is a_____________________. You can’t see the salt, but you can taste it in
the water.
• In contrast, sodium and chlorine bond to form table salt.
– Sodium is a soft, opaque, silvery ____________________
– Chlorine is a_____________________, poisonous gas
– Salt has none of these _______________________
– Mixtures can be separated
• Because substances in mixtures are not bonded, they can be separated using
_______________________ methods
– For example you can _____________________ the water out of salt water
– The physical properties of one substance will _____________________ from the
other, so they can be physically separated
• In contrast, compounds can only be separated by chemical change that breaks the
_________________________ between the elements.
– Look at the figure on page 339
Distillation of Salt Water