Which of the following is an example of chemical weathering? O A. Water freezes in cracks in a rock, breaking the rock apart.
O B. Weak acid breaks down minerals by reacting with them.
O C. Plant roots grow and split rock into pieces.
O D. An animal kicks a rock down a hill where it hits another rock and shatters.

O B. Weak acid breaks down minerals by reacting with them.

Explanation:

Chemical weathering is the process whereby rain water which sometimes can be acidic ( As rain falls down it reacts with CO2 in the atmosphere and form acid rain), This  reacts  with the minerals contained in rocks, dissolves and degrades  them further to form entire  new minerals.

An example of a rock that is greatly affected by overexposure of  acid rain is  limestone containing calcite  which easily degrades by acid rain.

Other processes whereby Chemical weathering can occur are through reaction with water and oxygen.

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

where's the diagram?