Question

1. determine whether each statement below describes a physical property or a chemical property of an element.

a) it is pale yellow gas at room temperature

b) it can burn or etch glass permanently

c) its density is 1.695g/l

d) it explodes when it reacts with water

1. decide whether the following statements are qualitative or quantitative:

a) a slice of cake has 450 calories

b) the cookies taste good

c) he has a mass of 82 kg

d) the density is 15 g/ml

Explanation:

Question 2 (Physical vs Chemical Property)

Part a)

Step1: Recall property types

Physical property: observable without chemical change. Color/state are physical.

Step2: Analyze the statement

"It is pale yellow gas at room temperature" describes color (pale yellow) and state (gas) – physical properties. So the original "chemical change" is incorrect; correct is physical property.

Part b)

Step1: Recall property types

Chemical property: relates to chemical reactions (burning, etching glass involves reactions).

Step2: Analyze the statement

"It can burn or etch glass permanently" involves chemical reactions (burning is combustion, etching glass is a chemical process). So "chemical change" (note: property, but the reasoning about chemical nature holds) – the label "chemical change" here is misnomer (should be chemical property), but the classification of "chemical" (nature) is correct in essence (since it’s a chemical property).

Part c)

Step1: Recall property types

Physical property: density is a physical (intensive) property, measurable without reaction.

Step2: Analyze the statement

"Its density is 1.695g/L" – density is physical. The original "physical change" is misnomer (should be physical property), but the classification of "physical" is correct.

Part d)

Answer:

Step1: Recall data types

Quantitative: numerical measurement (15 g/mL is a number).

Step2: Analyze the statement

"The density is 15 g/mL" – 15 is a number, so quantitative. The original "quantitative" (spelling error) is correct.

Final Answers (Corrected/Confirmed)

Question 2:

a) Physical Property
b) Chemical Property
c) Physical Property
d) Chemical Property

Question 3:

a) Quantitative
b) Qualitative
c) Quantitative
d) Quantitative