Salt
Coffee
Flour
Oil
Pepper
Ethanol
(Etc.)
Answer:
D. release of carbon dioxide on heating limestone
The answer should be B, it reacts in air to form a green layer.
Chemical properties means that how the substance that reacts with other substance to produce new substances. Usually it cannot be measured or observed just with the substance itself.
From all the options above, only B is a reaction. The green layer formed is a new substance produced by copper and air. It involves a chemical change.
Other options like boiling points or state of matter, these are physical properties. They do not require it to react to other substances and the can be measured and observed easily.
Answer: your answer is A
Explanation: the atoms has the same properties of the same element as the atomic number.
