11. An unknown substance has a homogeneous appearance. Which of the following statement is TRUE? *
1 point
A. It must be a pure substance since it is homogeneous.
B. It can no longer be broken down into simpler substance.
C. All parts of this substance have uniform properties.
D. It is either an element or compound.
12. Which type of mixture is heterogeneous containing solid particles that are sufficiently large for sedimentation? *
1 point
A. Suspension
B. B. Solution
C. Colloid
D. Mixture
13. Besides particle size, colloids have other identifying properties. Which one of the properties is peculiar to colloid when a relatively narrow bean of light passed through the system? *
1 point
A. Brownian Movement
B. Tyndall Affect
C. Absorption Effect
D. Sedimentation Effect
14. Which of the following is an example of a suspension? *
1 point
A. Alcohol
B. Ice cream
C. water and sand
D. Mayonnaise
15. Which of the following is an example of colloid? *
1 point

Ice cream

B. Vinegar

C. Water and sand

D. Cola
16. Why is Carbon considered an element while carbon dioxide is a compound? Carbon dioxide is ____________ *
1 point
A. a gas at room temperature.
B. made of two different elements.
C. given off by green plants.
D. released by humans through exhalations.
17. Sugar is heated in a test tube until it is completely changed into a black mass and droplets of water. In this experiment how will you classify the sugar? *
1 point
A. Element
B. Compound
C. Non metal
D. Metal
18. Which of the following is an element? *
1 point
A. Air
B. Salt
C. Sugar
D. Iron
19. The following substances are examples of compound EXCEPT: *
1 point
A. Ammonia
B. Helium
C. Hydrogen Peroxide
D. Table Sugar
20. What element is responsible in maintaining a healthy thyroid gland? *
1 point
A. Gold
B. Hydrogen
C. Iron
D. Iodine