Which sample of matter can be separated into different substances by physical means?
(1) licl(aq) (3) nh3(g)
(2) licl(s) (4) nh3(l)

(1) LiCl(aq)

Explanation:

Question:

Which sample of matter can be separated into different substances by physical means?

1.      LiCl(aq) ✔

2.     LiCl(s) ❌

3.     NH₃(g) ❌

4.     NH₃(ℓ) ❌

Reason:

LiCl(a) is a mixture of a compound and water. The LiCl can be separated from the water. All the other choices are compounds.

Related Vocabulary:

- Aqueous: a water solution , indicated by the notion "(aq)". For example, HCl(aq) indicated a water solution of hydrochloric acid.

- Matter: Anything that has mass and takes up space.

solute : a solute is a substance that is dissolved in another substance is known as a solvent. it is mixed with a special mixture know as homogeneous mixture.

solvent: a solvent is a substance that dissolved a solute, which results in a solution is known as solvent.

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

that's it!

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~ trueboss72