SUBSTANCES & MIXTURES
Science 7 Unit 1 Module 2
WHAT ARE SUBSTANCES?
a material of a particular kind
(Merriam-Webster Dictionary)
simplest form of matter
WHAT ARE MIXTURES?
contain two or more components
combination of two or more
substances
CHARACTERISTICS OF SUBSTANCES
Has same boiling temperature
Melts completely/smoothly within a short time
CHARACTERISTICS OF MIXTURES
May be solid, liquid or gas
May be homogeneous or heterogeneous
Made up of two or more components
Components may be separated/recovered
physical means such as filtration, and distillation
by
CHARACTERISTICS OF MIXTURES
Amount of components may vary
Has a changing boiling temperature
Does not melt completely/smoothly, that there
are some portions that seem to be not melting
Seawork #1.4: Make a Venn Diagram of
the characteristics of substances and mixtures
SUBSTANCES
MIXTURES
Seawork #1.5
MULTIPLE CHOICE. Choose the letter of the correct answer. Copy
the problems and show your complete solution. Write your answers
in your notebook.
1. You were tasked to check if the liquid sample you have is a substance
or a mixture. Which among these tests is the BEST way to do so?
I. Color comparison
III. Boiling test
II. Taste comparison
IV.Melting test
A. I, II, III and IV
C. I, II and IV only
B. I, II and III only
D. I and III only
Seawork #1.5
MULTIPLE CHOICE. Choose the letter of the correct answer. Copy
the problems and show your complete solution. Write your answers
in your notebook.
2. A liquid has the following properties: one-phase, colorless, boils at
varying temperature. Which of the following BEST describes the
liquid?
A. Solution
B. Substance
C. Suspension
D. Coarse mixture
Seawork #1.5
MULTIPLE CHOICE. Choose the letter of the correct answer. Copy
the problems and show your complete solution. Write your answers
in your notebook.
3. Jill has an unopened box of a 2-meter foil labeled 100% made of aluminum.
Aluminum is a substance. Jill takes just a thumb-size piece of the aluminum foil.
Which of the following statements is TRUE about the piece of aluminum foil
that Jill took compared with the rest that was left in the box?
A. Its mass and melting behavior are different.
B. Its mass and melting behavior are the same.
C. The mass is different but the melting behavior is the same.
D. The mass is the same but the melting behavior is different.
Seawork #1.5
MULTIPLE CHOICE. Choose the letter of the correct answer. Copy
the problems and show your complete solution. Write your answers
in your notebook.
4. Which of the following is NOT a pure substance?
A. Water
B. Salt
C. Soil
D. Iron
Seawork #1.5
MULTIPLE CHOICE. Choose the letter of the correct answer. Copy
the problems and show your complete solution. Write your answers
in your notebook.
5. Which of the following is NOT a mixture?
A. Soil
B. Sugar
C. Seawater
D. Sediments