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Physical and Chemical Properties

100

Give an example of a physical property and a chemical property.

physical properties: density, boiling point, melting point, color, mass, volume, conductivity, luster, malleability chemical properties: reactivity, flammability, turning lithmus paper red or blue, corrosive

200

How many of these properties are physical property(s)of aluminum? A) Aluminum is malleable. B) Aluminum conducts an electric current. C) Aluminum has a density of 2.698 g/cm3. D) Aluminum has a melting point of 660.37oC. E) Aluminum is highly reactive when placed in sulfuric acid.

4

300

4. Which lab procedure would provide information about the chemical properties of a clear liquid substance? A) A student should cool the substance to find its freezing temperature. B) A student should observe the rate at which it evaporates. C) A student should compare the substance’s density to the density of water. D) A student should add an acid to the substance to see whether a gas is produced. E) A student should waft the vapors produced by the liquid to see if it has a distinct odor.

D

400

5. Many processes occur in the digestive system. Which process is best classified as a physical change? A) Teeth grinding an almond into smaller pieces in the mouth B) Bacteria converting lactose into simple sugars in the intestines C) Digestive enzymes breaking down proteins into smaller fragments D) Saliva converting the starch molecules in crackers into simple sugars E) Stomach acid reacting with food to break it down into simpler molecules

A

500

Explain the difference between a chemical property and a physical property.

answers may vary

Density

100

A thermometer is filled with 8 mL of mercury. The mercury inside the thermometer has a mass of 108.8 grams. What is the density of mercury?

13.6 g/mL

200

Will a block float in olive oil (D = 0.8g/mL)? The density of the block is : 0.94 g/mL

No

300

7. Mr. Newcomer was performing an experiment to determine the density of an unknown liquid. His data table is included below. Volume of Unknown Liquid 2.0 mL Mass of Empty Graduated Cylinder 15.3 g Mass of Empty Graduated Cylinder + Unknown Liquid 19.5 g When he completed his experiment, he compared his results to the list of possible liquids. Liquid Density Rubbing Alcohol 0.80 g/mL Glycerin 1.9 g/mL Mercury 13.6 g/mL Bromine 3.2 g/mL What is the most likely identity of his unknown liquid?

Glycerin

400

A cube of ice measures 5.80 cm on one side and has a density of 0.917 g/mL. What is the mass?

179 g

500

A student is asked to determine the density and the identity of a metal. The student determines the mass of the metal to be 102.06g and then determines the volume of the sample using water displacement. Volume of graduated cylinder with water only: 39mL Volume of graduated cylinder with water and metal:49mL

10.20 g/mL

Acids and Bases

100

List 2 chemical properties of bases. List 2 physical properties of acids.

bases: turn lithmus paper blue, do not react with metals, create salt and water when reacted with acids acids: sour taste, conduct electricity

200

The table below represents observations Mr. Iverson’s students made during an activity. - Turns pH paper red -Reacts with metals - Corrosive Which of the following would be the most appropriate title for this chart? F) Qualitative Observations of the Chemical Properties of a Base G) Qualitative Observations of the Chemical Properties of an Acid H) Qualitative Observations of the Physical Properties of a Base J) Qualitative Observations of the Physical Properties of an Acid K) Quantitative Observations of the Chemical Properties of an Acid

G

300

This is a chart that Juan Carlos created of a few household items and their pH. Item pH HCL 2.1 vinegar 2.9 distilled water 7.0 lemon juice 2.3 black coffee 5 bleach 12.5 toothpaste 9.9 How many of the items would turn litmus paper blue?

2

400

How will the pH of the distilled water be affected by the addition of the hydrochloric acid?

the pH of the distilled water will begin at a pH of 7 and will decrease after the acid is added

500

Predict what would happen if you mixed an substance with a pH of 2 and a substance with a pH of 12

The pH would approach a more neutral pH