Question

Jesse was viewing two water samples. Once beaker was filled with 250 mL of distilled water and the other beaker was filled with 250 mL of tap water. Upon viewing the two using an electron microscope, he noted that the tap water had different elements present in addition to H2O molecules, whereas the distilled water had only H2O molecules.

Which conclusion below could Jesse write based on his observations?


Question 12 options:

Tap water is a mixture, as it is made of different particles that keep their own chemical properties. Distilled water is a mixture made up of hydrogen and oxygen atoms.

Tap water is a pure substance that consists of different elements bonded together, therefore it is a compound. Distilled water is also a pure substance with different elements bonded together, making it a compound.

Tap water is a mixture that consists of different molecules that are not bonded together and maintain their own chemical properties. Distilled water is a pure substance that consists of only one type of compound.

Tap water is a mixture that consists of different molecules that are not bonded together and maintain their own chemical properties. Distilled water is a pure substance that is made up of one type of molecule, making it an element.

Answer 1

Answer is: Tap water is a mixture that consists of different molecules that are not bonded together and maintain their own chemical properties. Distilled water is a pure substance that consists of only one type of compound.

1) Tap water is mixture (solution) consist of the pure water (H₂O) and dissolved salts. Water can be separated from salts by boiling.

Solution is homogeneous mixture composed of two or more substances.

In aqueous solution, solvent is water and solute (salt) is a substance dissolved in water.

2) Distilled water consists only molecules of water. In water, oxygen and hydrogen atoms are bonded with covalent bonds.

Answer 2

Jesse could conclude that tap water is a mixture that consists of different molecules that are not bonded together. Distilled water is a pure substance that consists of only one type of compound.

However, Jesse wouldn’t be able to see the molecules even with an electron microscope.