Answer:
physical
Explanation:
Mixtures can be separated through physical changes, including techniques such as chromatography, distillation, evaporation, and filtration.
Answer:
Fluorine is a <em>non-metal, fills its shell by gaining one electron </em>and<em> becomes a negatively charged ion.</em>
Explanation:
Fluorine have seven electrons in its outermost shell. This means that fluorine is located in Group 17(<em>Halogens</em>) in the Periodic Table. Note that halogens are non-metal elements. So fluorine is a non-metal.
Fluorine fills its shell by gaining one electron because it only needs one electron to achieve stable octet electron arrangement. ( it's easier to gain one electron than to lose all seven electrons in the outermost shell)
As fluorine atom gain one electron to achieve stable octet electron arrangement, its number of electrons becomes greater than its number of protons. So it becomes a negatively charged ion.
The answer would be G, a vacuum.
Explanation: Sound waves can't travel through a vacuum because a vacuum lacks air. Without air, no vibrations can occur and vibrations is a fundamental part for how sound is possible. Without it, sound waves can't travel.
Answer:
E.
Explanation:
All answers other than E have the incorrect bonding capabilities or other incorrect information.
Answer:
When potassium reacts with arsenic to form an ionic compound, each metal atom loses 1 electron(s) and each nonmetal atom gains 3 electron(s). There must be 3 potassium atom(s) for every 1 arsenic atom(s) in the reaction.
Explanation:
We need to consider the octet rule: each atom will gain or lose electrons to have 8 electrons in its valence shell.
- Potassium is in Group 1, so it has 1 valence electron, which will lose to form K⁺.
- Arsenic is in Group 15, so it has 5 valence electrons. Then, it will gain 3 electrons to form As³⁻.
To have an electrical molecule between K⁺ and As³⁻, we require 3 K⁺ and 1 As³⁻, and the resulting formula is K₃As.
