mixtures can be separated by physical methods while pure substance cannot be separated. which of the following groups contain only pure substances?
a. air, methan,sodium chloride
b. iron, ethanol,calcium fluoride
c. ammonia,vinegar and silicon
Pls po pa help
Share
Answer:
B
Explanation:
Pure substances are made up of only one kind of particle and have a fixed or constant structure. Calcium fluoride is the inorganic compound of the elements calcium and fluorine. Ethanol is a pure compound because it is formed by carbon bonding with hydrogen and oxygen. Hence, calcium fluoride and ethanol are compounds.
An element is a pure substance that cannot be broken down into different substances; iron is an example of an element.