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.
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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.

b. acid is the correct answer @jayxboof all social media

acid : acids are those which accepts an electron-pairs.

base : bases are those which donates ab electron-pairs.

alkali : it is a base that dissolves in water. it is basically a base and the ph greater than 7.

hydroxide ion : it is a poly-atomic ion which is negatively charged.

we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).