Answer:
Noble gases because they have a full outer shell of electrons.
Explanation:
Noble gases usually called inert gases are generally non reactive gases. They belong to group 18 elements.They tend to not gain the electron or not give up a electron as they have full valence shells. Because they already have full valence shell and therefore full outer energy level, they are very stable and hardly react with any other elements.
Answer:
3566.4 days
Explanation:
The reaction follows a first-order
Rate = kC = change in concentration/time
k = 0.2 day^-1
C = 0.14 mg.L^-1
Co = 100 mg.L^-1
0.2×0.14 = 100 - 0.14/t
t = 99.86/0.028 = 3566.4 days
Answer:
Tin (IV) sulfide and antimony (III) sulfide be separated from copper (II) sulfide and bismuth (III) sulfide by the addition of sodium hydroxide because they become soluble whereas copper (II) sulfide and bismuth (III) sulfide remain insoluble.
Explanation:
Sodium hydroxide is a basic solution which is used as a precipitating agent for metallic ions in the laboratory.
<em>When a solution containing a mixture of the sulfides of the Group II cations, antimony (III), copper (II), tin (IV), and bismuth (III), is made basic by the addition of a base such as sodium hydroxide or ammonium hydroxide, the sulfide ion concentration will increase. The sulfides of antimony (III) and tin (IV) will then become soluble because antimony (III) and tin (IV) form stable complexes with sulfide, which are soluble in water, while the sulfides of copper (II) and bismuth (III) do not.</em> The result is the dissolution of the antimony (III) sulfide and tin (IV) sulfide, separating them from the copper (II) sulfide and the bismuth (III) sulfide.
Sb₂S₃(s) + 3S²⁻(aq) ----> 2SbS₃³⁻(aq)
SnS₂(s) + S²⁻(aq) ----> SnS₃³⁻(aq)
The answer here is ionic compound, because they dissociate in water to form ions that conduct electricity well through the solution.
Molecular compounds and nonmetallic elements tend to be poorer conductors, while metallic elements are good conductors in the solid phase.
The letter D bc velocity must inlude SPEED AND DIRECTION☺