What I know
Directions: Read each item carefully. Write only the letter of the correct answer for each question. Use a seperate sheet for your answer.
1. What are the two (2) classes of matter?
A. atom ang molecule
B. element and compound
C. plant and animal cells
D. substance and mixture
2. Which is true regarding water?
A. compound of element
B. element of gases
C. mixture of gases
D. substances of gases
3. What is the difference between a substance and a mixture?
A. Substance can be seperated while mixture cannot be seperated.
B. Substance has many components while mixture cannot be seperated.
C. Substance is heterogeneous while mixture is homogeneous.
D. Substance is pure while mixture is impure.
4. To seperate salt from water in a seawater mixture, what process is used?
A. Condensation
B. Distillation
C. Evaporation
D. Filtration
5. Which of the following is a property of mixture?
A. It has a definite composition
B. It consists of a single phase
C. It has a heterogeneous composition
D. It can be chemically seperated into its components.
6. Which of the following is a physical appearance of a substance?
A. complicated
B. homogeneous
C. heterogeneous
D. non-uniform
7. Which one is the best way to determine whether an unknown sample is a substance or a mixture?
A. knowing its density
B. tasting the given sample
C. observing its physical appearance
D. testing its melting and boiling point
8. Which is NOT a technique to seperate components of mixture?
A. Condensation
B. Distillation
C. Evaporation
D. Filtration
9. Which of the following is a heterogeneous mixture?
A. air
B. oil in water
C. stainless steel
D. soft drink
10. What is/are true for substance and mixture?
A. I and II only
B. I and III only
C. II and IV only
D. I and IV only
11. What does it indicate when a sugar is heated in a test tube until it is completely changed into a black mass and droplets of water?
A. compound
B. element
C.mixture
D. solution
12. What substance is made by mixing two elements without undergoing chemical process?
A. compound
B. element
C.mixture
D. solution
13. What is the best way to use in seperating iron parts from a mixture?
A. filter paper
B. magnet
C. water
D. spoon
14. Which of the following uses evaporation as a means of seperating the components of the given mixture?
A. iron fillings and sand
B. pebbles and water
C. sand and gravel
D. sugar and water
15. Which of the following statements distinguishes pure substances from mixtures?
A. They can seperated by physical means
B. They are consists of two or more kinds of matter.
C. They have no specific solubility and densities
D. They have constant boiling temperature and melting temperature?

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