1. Which of the following properties identifies a pure substance? *
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A. Soluble in water
B. Tasteless and odorless
C. Has a constant boiling temperature
D. Can undergo several phase changes
2. Ella is experimenting on how to identify two liquid samples. The data she gathered is shown in the table below. What can be inferred from the table? *
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A. Liquid A is an element while liquid B is a mixture
B. Liquid A is a mixture while Liquid B is a pure substance.
C. Liquid A is an element while Liquid B is a substance.
D. Liquid A is a pure substance while liquid B is a mixture
3. A pinch of bread was placed inside a test tube and heated until it became blackish in color and released some gas. Which of the following statement/s is/are true about bread based on to the given information? *
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B. II & III
C. II only
D. III & IV
A. I & II
4. Water boils at 100˚C and pure ethanol at 78˚C. Which of the following statement/s is/are TRUE about water and ethanol? *
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A, I only
B. III only
C. I, III, and IV
D. III & IV
5. Sodium chloride dissolves in water very well. Which is NOT TRUE in the following statements? *
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A. Water is a pure substance.
B. Sodium chloride is a pure substance
C. Dissolving sodium chloride with water produces a mixture.
D. Sodium chloride can ONLY be dissolved in water.