Your answer is: A. tetrahedral
Hope this helped! :D
Answer:
B)
Explanation:
Dalton was the first scientist to propose an atomic model. He said that each element is composed of extremely small particles called atoms, which are indivisible, atoms of a given element are identical, and atoms of different elements have different properties.
With the advance of the studies, it was proven that elements are composed of small particles, atoms and that the atoms of each element are identical, and have different properties from atoms of different elements.
But, now we know that the atom can be divisible: it's formed by electrons, protons, and neutrons. So only postulate <em>ii</em> is no longer considered valid.
Ksp=3.45×10⁻¹¹
CaF₂(s) ⇄ Ca²⁺(aq) + 2F⁻(aq)
Ksp=[Ca²⁺][F⁻]²
[Ca²⁺]=C(CaF₂)
[F⁻]=2C(CaF₂)
Ksp=4{C(CaF₂)}³
C(CaF₂)=∛(Ksp/4)
C(CaF₂)=∛(3.45×10⁻¹¹/4)=2.05×10⁻⁴ mol/L
2.05×10⁻⁴ M
2 is right am 70 percent sure
Answer:
The volume at STP is 0,441 L (441ml)
Explanation:
We use the gas formula, which results from the combination of the Boyle, Charles and Gay-Lussac laws. According to which at a constant mass, temperature, pressure and volume vary, keeping constant PV / T. The conditions STP are 1 atm of pressure and 273K of temperature. We convert the unit Celsius into Kelvin, the volume in ml into L and the pressure in mmHg into atm:
0 ° C = 273K, 20 ° C = 273 + 20 = 293K ; 500/1000= 0,500 L
760mmHg---1 atm
720mmHg----x= (720mmHgx 1 atm)/760mmHg= 0,947 atm
P1xV1/T1= P2xV2/T2
V2=((P1xV1/T1)xT2)/P2
V2=((0,947atmx0,500L/293K)x273K)/1 atm
<em>V2= 0,441 L</em>
