3. Which of these recorded observations is qualitative, rather than quantitative?

A chemical reaction is complete in 2.3 s.
The solid has a mass of 23.4 g.
The compound melts at 87.5°C.
Iron is denser than aluminum.
с
D
Iron is denser than aluminum

Option D is qualitative data.

Iron is denser than aluminum.

Explanation:

Qualitative data:

The data which is measured without numerical values and describe only the qualities of substance is called qualitative data. For example,

The color of flame is red. It describe the quality of flame.

Sara is intelligent than her brother. It also describe the quality of Sara.

In given options, option D is qualitative data.

Iron is denser than aluminum.

Quantitative data:

The data which is measured in numerical values is called quantitative data. For example,

I have 1 dollar. It is quantitative data.

In given options, A,B,C shows quantitative data.

A chemical reaction is complete in 2.3 s.

The solid has a mass of 23.4 g.

The compound melts at 87.5°C.

out of these options:

ability to burn paper

pure sodium reacting violently with water

the boiling point of water

helium does not tend to react with anything

i would say this is a physical property:

helium does not tend to react with anything

why? :

i said helium does not tend to react with anything because well, it reacts to ! but ability to burn paper, pure sodium reacting violently with water, & the boiling point of water are chemical or

physical properties: the properties of a substance that can be observed without changing the chemical makeup of the substance

chemical properties: properties of a substance relating to the chemical nature and reactivity of the substance