Answer:
Modal means the one that occurs most often (averages: mode). In maths, the mode is one of the most common ways to describe a set of data. ... The modal class is, therefore, the group with the highest frequency.
Answer:
Explanation:
Equation of the reaction:
O3(g) + NO(g) ⟶ O2(g) + NO2(g)
From the Rate Law:
R = k[O3][NO]
The order of NO is 1 and that of O3 is also 1, therefore order of reaction = 1 + 1
= 2
Given :
Concentration of O3, [O3] = 7.0×10^-4M
Concentration of NO, [NO] = 5.0×10^-5M
Rate constant, k = 3.0 × 10^6M^-1s^-1
R = 3.0×10^6 × 7.0×10^-4 × 5.0×10^-5
= 0.105 M/s
The enthalpy change for the reaction 2K + S + K2S using the following thermochemical reactions is mathematically given as
dn=70.7kg
<h3>What is the enthalpy change for the reaction?</h3>
Generally, the equation for the Chemical reaction is mathematically given as
2k+s----->K2S
Therefore
KS+K----->K2S
Therefore
dn=dn1+dn2
dn=32.5+38.2
dn=70.7kg
In conclusion, the enthalpy change is
dn=70.7kg
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The solution which would react vigorously with zinc carbonate is Hydrochloric acid.
Explanation: When Zinc carbonate (ZnCO3) reacts with Hydrochloric acid (HCl), it gives rise to zinc chloride (ZnCl2) and carbon dioxide (CO2).
Answer:
See explanation below.
Explanation:
Both carbon and silicon are members of group 4A(now group 14) i n the periodic table. Carbon is the first member of the group. CO2 is a gas while SiO2 is a solid. In SiO2, there are single bonds between silicon and oxygen and the geometry around the central atom is tetrahedral while in CO2, there are double carbon-oxygen bonds and the geometry around the central atom is linear. CO2 molecules are discrete and contain only weak vanderwaals forces.
Again, silicon bonds to oxygen via its 3p orbital while carbon bonds to oxygen via a 2p orbital. As a result of this, there will be less overlap between the pi orbitals of silicon and that of oxygen. This is why tetrahedral bonds are formed with oxygen leading to a covalent network solid rather than the formation of a silicon-oxygen pi bond. A covalent network solid is known to be made up of a network of atoms of the same or different elements connected to each other continuously throughout the structure by covalent bonds.
In SiO2, each silicon atom is surrounded by four oxygen atoms. Each corner is shared with another tetrahedron. SiO2 forms an infinite three dimensional structure and melts at a very high temperature.