Answer:
Central metal oxidation state: +2
Coordination number: 6
Overall charge: -2
Explanation:
For the ion complex:
Na₂[Cr(NH₃)₂(NCS)₄]
The central metal is chromium, with NH₃ and NCS as the ligands.
NH₃ acts as a neutral ligand, while NCS carries a negative charge.
The entire complex has a charge of:
2Na⁺ + [Cr(NH₃)₂(NCS)₄]⁻² → -2
Since each NCS contributes -1 and there are four NCS, the Cr must possess an oxidation state of +2 to achieve an overall charge of -2.
With 2 NH₃ and 4 NCS attached, the coordination number sums to 2+4 = 6
I trust this clarifies the matter!
Vegetation cover serves as the most efficient and effective method to curb sediment loss. The roots of plants like grass interlink soil particles, aiding in erosion resistance, particularly against runoff water. Vegetation absorbs the force of raindrops, preventing soil particle detachment. Additionally, plants can lie flat resembling shingles on a roof, enabling runoff to travel over the soil rather than disturbing it.
Tall, erect vegetation functions as a barrier against wind, diminishing its force so that it cannot dislodge soil particles from the ground surface.
The amount of heat needed to elevate an object's temperature can be determined using the formula,
heat = mass x specific heat x (T2 - T1)
Thus, specific heat can be found with the following formula,
specific heat = heat / (mass x (T2 - T1))
By substituting,
specific heat = 645 J / ((28.4 g)(15.5 - - 11.6))
The calculated specific heat from the above equation is 0.838 J/g°C.
The thermal energy from the soup is transferred to Greg's hands.
At a pressure of 1.00 × 10⁻¹⁰ mmHg and a temperature of 273.15 K, the volume occupied by the 1.00 × 10⁶ moles of gas is 1.70 × 10²³ millilitres. This is derived from the universal gas equation PV = nRT, where V is the volume, n is the number of moles (1.00 × 10⁶), R is the universal gas constant (62.363 mmHg·L/(mol·K)), T is the temperature (273.15 K), and P is the pressure (1.00 × 10⁻¹⁰ mmHg). By substituting these values into the equation, we find the volume in millilitres equals 1.703 × 10²⁰ L converted to millilitres equals 1.703 × 10²³ millilitres.
