Which of these is true about pure substances?

a. they can only contain one type of atom

b. they can only contain one type of molecule

c. they may contain one type of atom or one type of molecule

d. they can contain different types of atoms and molecules

They can only contain one type of atoms, one type of molecules or one type of ionic salts

Explanation:

Remember that substances might be made of:

That said, pure substances would only contain one type of atoms, one type of molecules or one type of ionic salts. Any additional components of different atoms, molecules or ionic salts would cause a pure substance to become a mixture of several substances.

shield volcanos are angry and get mad over the smallest things so much that there heads erupt   pahoehoe and a'a lava. a composite volcano is the poller opposite of a shield volcano. its   peaceful thing and knows how to control its emotions.      

може ли да зареждате повече информация, моля