Answer:hello
The third one is correct.
Explanation:
Because the molecules of solids can just have some little vibration in their places.
The first one is for gas so it's incorrect.
The second one is for liquid.
And finally the third one is correct.
Good luck.
Answer:
Explanation:
Length: Length is a measure of distance
Height:The measurement from base to top or (of a standing person) from head to foot.
Circumference:The enclosing boundary of a curved geometric figure, especially a circle
Perimeter: Length of the outline of a shape.
Diagonal:A line segment that goes from one corner to another, but is not an edge. So when we directly join any two corners (called "vertices") which are not already joined by an edge, we get a diagonal. Diagonals of Polygons.
Diameter: A straight line passing from side to side of any figure or body, through its center.
Answer:
Option A: 1*10^-5 M HCl has a pH of 5
Explanation:
a) 1.0 * 10^‒5 M HCl
HCl = a strong acid
pH of HCl = -log[H+]
ph of a 10^‒5 M HCl = -log(10^-5) = 5
(b) 1.0 * 10^5 M NaOH
pOH = -log(10^-5) = 5
pH = 14 -5 = 9
(c) A solution containing approximately equal concentrations of hypochlorous acid (HOCl, Ka = 2.9 * 10^‒8) and the dissolved salt of its conjugate base sodium hypochlorite (NaOCl).
pH = pKa + log[NaOCl/HOCl]
Since [NaOCl]/ [HOCl]= 1
pH = pKa +log(1)
pH = pKa
pH = -log(2.9 * 10^-8)
pH = 7.54
(d) A solution containing approximately equal concentrations of potassium hydrogen phthalate (C8H5KO4, Ka = 3.91 * 10^–6) and the dissolved salt of its conjugate base potassium phthalate.
pH = pKa +log[potassium phthalate/C8H5KO4)
Since [potassium phthalate]/[C8H5KO4] = 1
pH = pKa
pH = -log(3.91*10^-6)
pH = 5.41
e) A solution containing approximately equal concentrations of ammonia (Kb = 1.8 * 10^‒5) and the dissolved salt of its conjugate acid ammonium chloride.
pOH = pKb +log[NH4Cl]/[NH3]
Since [NH4Cl]/[NH3] = 1
pOH = pKb
pOH = 4.74
pH = 14-4.74 = 9.26