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.
6. Ana wants to compare the chemical properties of two substances. In doing it, she prepared two flasks containing the substances and labeled them Liquid A and Liquid B. She monitored the boiling points of the liquids and found that the boiling points were 100˚C for substance A and 110˚C - 112˚C for liquid B. How would she classify the two liquids? *
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A. Liquid A is pure substance while Liquid B is a mixture.
B. Liquids A and B contain two or more atoms that are chemically bonded.
C. Liquid A has varying boiling points while liquid B has a fix boiling point.
D. Liquid A may be homogenous or heterogeneous but substance B is not.
7. Colloids is a mixture of two components, the dispersed particles and the dispersion medium. Which of the following is the substance comparable to the solvent in the solution? *
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A. Dispersed particles
B. Colloidal Medium
C. Dispersing medium
D. Colloidal particles
8. Which of the following is an example of a solution? *
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A. vinegar
B. mayonnaise
C. ice cream
D. oil and water
9. Which of the following describes a homogeneous mixture? *
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A. 2 substances present, 2 phases observed
B. 1 substance, 2 phases observed
C. 2 substance present, 1 phase observed
D. 1 liquid and 1 solid present, 1 color observed
10. A water molecule is made up of one Hydrogen and two Oxygen atoms. Why is water considered a pure substance? *
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A. Water molecules cannot be separated by physical means
B. Water can be combined with other substance by physical means.
C. Each water molecule is identical.
D. Water molecules are made up of different kinds of atoms.