Question

1. identify the following as a physical or chemical property

a) the color of a chemical
chemical property

b) the melting point of a chemical
physical property

c) ability to react with hydrochloric acid
physical property

d) does the chemical rust
physical property

1. identify the following as a physical or chemical changes

a) burning a piece of paper
chemical change

b) boiling water on the stove and seeing bubbles
physical change

c) adding hydrochloric acid to a solid metal and seeing bubbles
chemical change

Explanation:

Question 2 (Identifying Properties)

Part a)

Step1: Recall property types

Physical properties are observable without changing substance identity (e.g., color, state). Chemical properties relate to reactions (e.g., flammability, reactivity).

Step2: Analyze "The color of a chemical"

Color is observable without altering the substance’s chemical identity. So it’s a physical property. Wait, but the option here—wait, the original options: a) The color of a chemical. Wait, maybe a typo? Wait, the user’s image: for 2a, the dropdown is "chemical property" or "physical property"? Wait, no—wait, the problem is to identify as physical or chemical property. Color is a physical property. But maybe the options were mislabeled? Wait, no, let's re-express.

Wait, the user’s image shows for 2a: "The color of a chemical" with dropdowns. Wait, maybe the correct classification: color is a physical property. But let's check the options. Wait, maybe the options are: a) The color of a chemical – physical property? But the dropdown in the image might have "physical property" as an option. Wait, perhaps I misread. Let's proceed step by step.

Part b)

Step1: Recall property types

Melting point is the temperature at which a substance changes from solid to liquid—observable without chemical reaction.

Step2: Classify "The melting point of a chemical"

Melting point is a physical property (related to state change, no new substance formed).

Part c)

Step1: Recall property types

Chemical properties describe a substance’s ability to react (forms new substances).

Step2: Analyze "Ability to react with hydrochloric acid"

Reacting with HCl involves a chemical reaction (new substances form). So this is a chemical property.

Part d)

Step1: Recall property types

Rusting is a chemical reaction (iron + oxygen → rust). The ability to rust (or "Does the chemical rust") relates to its reactivity with oxygen—so it’s a chemical property? Wait, no—wait, "Does the chemical rust" is about its tendency to undergo a chemical change (rusting). So that’s a chemical property? Wait, but the dropdown in the image has "physical property" as an option. Wait, maybe a mistake? Wait, no—rusting is a chemical change, so the ability to rust is a chemical property. But maybe the option here is mislabeled. Alternatively, maybe "Does the chemical rust" is a physical property? No, rusting is chemical.

Question 3 (Identifying Changes)

Part a)

Step1: Recall change types

Chemical change: new substance formed (e.g., burning, combustion). Physical change: no new substance (e.g., phase change, cutting).

Step2: Analyze "Burning a piece of paper"

Burning paper produces ash, smoke, CO₂—new substances. So it’s a chemical change.

Part b)

Step1: Recall change types

Boiling water: water (liquid) → water vapor (gas)—same substance (H₂O), just phase change.

Step2: Classify "Boiling water on the stove and seeing bubbles"

No new substance, just phase change (liquid to gas). So physical change.

Part c)

Step1: Recall change types

Adding HCl to a solid metal: metal + acid → salt + hydrogen gas (bubbles are H₂). New substances formed.

Step2: Analyze "Adding hydrochloric acid to a solid metal and seeing bubbles"

Bubbles are H₂ gas (new substance), so chemical change.

Final Answers (Question 2 and 3)

Question 2:

a) The color of a chemical – physical property (color is observable without reaction).
b) The melting point of a chemical – physical property (state change, no new substance).
c) Ability to react with hydrochloric acid – chemical property (involves reaction, new su…

Answer:

Step1: Recall property types

Physical properties are observable without changing substance identity (e.g., color, state). Chemical properties relate to reactions (e.g., flammability, reactivity).

Step2: Analyze "The color of a chemical"

Color is observable without altering the substance’s chemical identity. So it’s a physical property. Wait, but the option here—wait, the original options: a) The color of a chemical. Wait, maybe a typo? Wait, the user’s image: for 2a, the dropdown is "chemical property" or "physical property"? Wait, no—wait, the problem is to identify as physical or chemical property. Color is a physical property. But maybe the options were mislabeled? Wait, no, let's re-express.

Wait, the user’s image shows for 2a: "The color of a chemical" with dropdowns. Wait, maybe the correct classification: color is a physical property. But let's check the options. Wait, maybe the options are: a) The color of a chemical – physical property? But the dropdown in the image might have "physical property" as an option. Wait, perhaps I misread. Let's proceed step by step.

Part b)

Step1: Recall property types

Melting point is the temperature at which a substance changes from solid to liquid—observable without chemical reaction.

Step2: Classify "The melting point of a chemical"

Melting point is a physical property (related to state change, no new substance formed).

Part c)

Step1: Recall property types

Chemical properties describe a substance’s ability to react (forms new substances).

Step2: Analyze "Ability to react with hydrochloric acid"

Reacting with HCl involves a chemical reaction (new substances form). So this is a chemical property.

Part d)

Step1: Recall property types

Rusting is a chemical reaction (iron + oxygen → rust). The ability to rust (or "Does the chemical rust") relates to its reactivity with oxygen—so it’s a chemical property? Wait, no—wait, "Does the chemical rust" is about its tendency to undergo a chemical change (rusting). So that’s a chemical property? Wait, but the dropdown in the image has "physical property" as an option. Wait, maybe a mistake? Wait, no—rusting is a chemical change, so the ability to rust is a chemical property. But maybe the option here is mislabeled. Alternatively, maybe "Does the chemical rust" is a physical property? No, rusting is chemical.

Question 3 (Identifying Changes)

Part a)

Step1: Recall change types

Chemical change: new substance formed (e.g., burning, combustion). Physical change: no new substance (e.g., phase change, cutting).

Step2: Analyze "Burning a piece of paper"

Burning paper produces ash, smoke, CO₂—new substances. So it’s a chemical change.

Part b)

Step1: Recall change types

Boiling water: water (liquid) → water vapor (gas)—same substance (H₂O), just phase change.

Step2: Classify "Boiling water on the stove and seeing bubbles"

No new substance, just phase change (liquid to gas). So physical change.

Part c)

Step1: Recall change types

Adding HCl to a solid metal: metal + acid → salt + hydrogen gas (bubbles are H₂). New substances formed.

Step2: Analyze "Adding hydrochloric acid to a solid metal and seeing bubbles"

Bubbles are H₂ gas (new substance), so chemical change.

Final Answers (Question 2 and 3)

Question 2:

a) The color of a chemical – physical property (color is observable without reaction).
b) The melting point of a chemical – physical property (state change, no new substance).
c) Ability to react with hydrochloric acid – chemical property (involves reaction, new substance).
d) Does the chemical rust – chemical property (rusting is a chemical reaction, new substance).

Question 3:

a) Burning a piece of paper – chemical change (new substances: ash, CO₂).
b) Boiling water on the stove and seeing bubbles – physical change (phase change, H₂O remains H₂O).
c) Adding hydrochloric acid to a solid metal and seeing bubbles – chemical change (gas (H₂) and salt formed, new substances).

(Note: If the problem expects specific dropdown selections (e.g., choosing from "chemical property", "physical property", "chemical change", "physical change" for each part), the answers above correspond to the correct classification for each scenario.)