select all the true statements. molecules of two different substances can be composed of the same chemical…

select all the true statements. molecules of two different substances can be composed of the same chemical elements but have different numbers of atoms. two different substances can be composed of different chemical elements. two different substances with crystal structures can be composed of the same chemical elements in the same ratio and also have the same arrangements of atoms.

select all the true statements. molecules of two different substances can be composed of the same chemical elements but have different numbers of atoms. two different substances can be composed of different chemical elements. two different substances with crystal structures can be composed of the same chemical elements in the same ratio and also have the same arrangements of atoms.

Answer

Brief Explanations:

  1. For the first statement, examples like carbon - monoxide (CO) and carbon - dioxide ($CO_2$) are composed of carbon and oxygen but have different atom numbers.
  2. The second statement is true as water ($H_2O$) and sodium chloride (NaCl) are made of different elements.
  3. The third statement is false. If two substances have the same chemical elements in the same ratio and same atom - arrangements, they are the same substance, not different substances.

Answer:

Molecules of two different substances can be composed of the same chemical elements but have different numbers of atoms. Two different substances can be composed of different chemical elements.