Answer:
A carbon-14 atom has 6 protons, 8 neutrons and 6 electrons. The number 12 or 14 in the name of carbon-12 and carbon-14 refers to their atomic mass.
Explanation:
Those atoms that have the same "atomic number" but differente "atomic mass" (or atomic weight) are called isotopes.
Atomic number indicates the amount of electrons that an atom has, which matchs with the number of protons it has.
Atomic mass indicates the sum of protons and neutrons that an atom has.
Example with carbon-12:
carbon atomic number = 6 (find this information in a periodic table)
electrons= 6
protons= 6
carbon atomic mass = 12 (find this information in a periodic table)
neutrons= atomic mass - number of protons= 12-6 = 6 neutrons
Using the same analysis for carbon-14:
carbon atomic number = 6
electrons= 6
protons= 6
carbon atomic mass = 14
neutrons= atomic mass - number of protons = 14-6 = 8 neutrons
In this way, carbon-14 is an isotope of carbon-12 because carbon-14 has the same atomic number than carbono-12 but different atomic mass.
linear
trigonal planar
trigonal pyramidal
Answer:
bent
Explanation:
How many moles of water are produced when 2 moles of NH4 react with excess Oxygen gas?
The moles of water are produced when 2 moles of NH4 react with excess Oxygen gas is 4 mole of H2O.
Moles are defined as a common unit used in science to measure vast numbers of extremely small things, such atoms, molecules, or other specific particles.
It can also be defined as a metric in chemistry that is used to describe a very high quantity of molecules, atoms, or particles.
Since we only have two moles of NH4, we switch out four for two.
2 NH4 + 3O2 --> 2NO + 4 H2O
As per the reaction, in order to produce 2 moles of NO2 and 4 moles of H2O, 2 moles of NH4 must react with 3 moles of oxygen gas.
Thus, the moles of water are produced when 2 moles of NH4 react with excess Oxygen gas is 4 mole of H2O.
To learn more about moles, refer to the link below:
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The theoretical yield is calculated from the amount of the excess reactant present.
The theoretical yield is calculated from the amount of the limiting reactant present.
Answer: the fourth stament, The theoretical yield is calculated from the amount of the limiting reactant present.
Justification:
1) Limiting reactant is the one that is in less proportion than the theoretical mole ratio.
2) Excess reactant is the one that is in greater proportion than the theoretical ratio.
3) For example, if you have the equation A + 2B → C, means that 1 mol of A react with 2 moles of B to yield 1 mol of C.
As per that equation, the theoretical mole ratio is 1 mol of A : 2 moles of B : 1 moles of C.
If the actual amounts of A and B were 2 and 4, respectively, they were in the same ratio as the theoretical ratio, and all of the both reactants could react.
But if you had, for example, 2 moles of reactant A and 2 moles of reactant B, only one of the moles of A could react with the 2 moles of B, so B would be the limiting reactant: the whole 2 moles of B would react, while only 1 mole of A would reactant, and 1 mole of A would be left over (A is in excess).
Therefore, you cannot use the 2 moles of A to calculate the theoretical yield (since only 1 mole reacted), instead you must use the limiting reactant (B), which is the one that reacts completely.
The correct answer for above statement:
chromium is in group 6 d-block
Explanation:
The d-block elements are designated transition metals and have valence electrons in d orbital's. The f-block elements, observed in the two rows at the ground of the periodic table, are called inner transition metals and have valence electrons in the f-orbital's.
Chromium is a synthetic element with symbol Cr and atomic number 24. It is the first component in group 6. It is a steely-gray, glistening, dense and brittle metal which takes a high polish, resists smudging, and has a great melting point.