Question

classify the following properties as either chemical or physical by checking the appropriate column.
blue color
density
flammability
dissolves in water
boils at 100 degrees
scratches glass
sour taste
rusting
exploding fireworks
melting point
reacts with water to form a gas
reacts with something to form water
hardness
boiling point
luster (shine)
odor
identify each of the following as an example of physical property or chemical property.

1. silver tarnishes when it comes in contact with hydrogen sulfide in the air.
2. a banana is yellow.
3. a sheet of copper can be pounded into a bowl.
4. gasoline is flammable.
5. a diamond is the hardest natural substance.
6. helium does not react with any other element.
7. a bar of lead is more easily bent than is a bar of aluminum of the same size.
8. potassium metal is kept submerged in oil to prevent contact with oxygen or water.
9. an apple will turn brown if exposed to oxygen

Explanation:

Step1: Recall definitions

Physical properties can be observed or measured without changing the substance's chemical identity. Chemical properties involve a substance's ability to undergo a chemical change.

Step2: Classify properties in the table

• Blue color: Physical property, observed without chemical change.
• Density: Physical property, measurable without chemical change.
• Flammability: Chemical property, involves burning - a chemical change.
• Dissolves in Water: Physical property, no new substance formed usually.
• Boils at 100 degrees: Physical property, phase - change without chemical reaction.
• Scratches glass: Physical property, related to hardness, no chemical change.
• Sour taste: Physical property, sensory observation without chemical change.
• Rusting: Chemical property, iron reacts with oxygen to form rust.
• Exploding fireworks: Chemical property, involves chemical reactions and formation of new substances.
• Melting point: Physical property, phase - change without chemical reaction.
• Reacts with water to form a gas: Chemical property, new substance (gas) formed.
• Reacts with something to form water: Chemical property, new substance (water) formed.
• Hardness: Physical property, measurable without chemical change.
• Boiling point: Physical property, phase - change without chemical reaction.
• Luster (shine): Physical property, observed without chemical change.
• Odor: Physical property, sensory observation without chemical change.

Step3: Answer sub - questions

1. Silver tarnishes when it comes in contact with hydrogen sulfide in the air. Chemical property, as a chemical reaction occurs to form silver sulfide.
2. A banana is yellow. Physical property, color is an observable physical characteristic.
3. A sheet of copper can be pounded into a bowl. Physical property, malleability is a physical property.
4. Gasoline is flammable. Chemical property, burning is a chemical reaction.
5. A diamond is the hardest natural substance. Physical property, hardness is a physical characteristic.
6. Helium does not react with any other element. Chemical property, describes its chemical reactivity.
7. A bar of lead is more easily bent than is a bar of aluminum of the same size. Physical property, related to malleability and ductility.
8. Potassium metal is kept submerged in oil to prevent contact with oxygen or water. Chemical property, as potassium reacts with oxygen and water in chemical reactions.
9. An apple will turn brown if exposed to oxygen. Chemical property, oxidation (a chemical reaction) occurs.

Answer:

Property	Physical Property	Chemical Property
Density	X
Flammability		X
Dissolves in Water	X
Boils at 100 degrees	X
Scratches glass	X
Sour taste	X
Rusting		X
Exploding fireworks		X
Melting point	X
Reacts with water to form a gas		X
Reacts with something to form water		X
Hardness	X
Boiling point	X
Luster (shine)	X
Odor	X

1. Chemical property
2. Physical property
3. Physical property
4. Chemical property
5. Physical property
6. Chemical property
7. Physical property
8. Chemical property
9. Chemical property