<span>The answer is "A tetrahedral molecule has 4 regions of high electron density around the central atom. These molecules have central atoms with 0 lone pairs and 4 atoms bonded to them." Based on the octet rule, the atom must have 8 electrons to become stable. As a result, the molecule will not have lone pairs.</span>
Answer:approx 300,000 years ago
Explanation:
Fossils attributed to H. sapiens, along with stone tools, dated to approximately 300,000 years ago, found at Jebel Irhoud, Morocco yield the earliest fossil evidence for anatomically modern Homo sapiens
Answer:
The new pressure is 1.05 atm
Explanation:
Step 1: Data given
Number of moles oxygen gas = 6.2 moles
Volume of the cylinder = 4.3 L
Pressure of the gas = 3.8 atm
The volume changed to 15.5 L
Step 2: Calculate the new pressure
P1*V1 = P2*V2
⇒with P1 = the initial pressure of the gas = 3.8 atm
⇒with V1 = the initial volume = 4.3 L
⇒with V2 = the increased volume = 15.5 L
⇒with P2 = the new pressure = TO BE DETERMINED
3.8 atm * 4.3 L = 15.5 L * P2
P2 = (3.8 atm *4.3 L) / 15.5 L
P2 = 1.05 atm
The new pressure is 1.05 atm
Unburned hydrocarbon on reacting with oxygen undergoes combustion reaction. However, the activation energy of this reaction is significantly high. When a catalyst like Pd is added to the reaction system, it provides active sites for the reaction to occur. It acts are a heterogeneous catalyst. It is pertinent of note that catalyst is refereed as heterogeneous, when it exist in different phase as compared to reactant and products. In present case, reactants and products are in gas phase, while catalyst is in solid phase. Due to availability of larger surface area at active site of Pd, activation energy of reaction decreases and decrease in activation energy favors higher reaction rates.
Chlorine has that electron configuration
