Features which are found in plant cellsonly are the chloroplast, large vacuole and cell wall.
Therefore, Only plant cells have "acellwall,chloroplastsandalargevacuole."
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Only plant cells have a cell wall, chloroplasts, and a large vacuole.
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c. colloids
b. suspensions
d. none of the above
c. Entropy
b. Heating curve
d. Free energy
Answer: a. Enthalpy
Explanation:
Each line represents a single bond (two electrons), and the lone pairs of electrons are shown as dots. Carbon forms single bonds with three hydrogen atoms and one bromine atom, resulting in a stable Lewis structure that satisfies the octet rule for each element and minimizes formal charges.
To draw the Lewis electron-dot diagram for bromomethane (CH3Br), follow these steps:
Determine the total number of valence electrons for each element in the molecule:
Carbon (C) has 4 valence electrons.
Hydrogen (H) has 1 valence electron.
Bromine (Br) has 7 valence electrons.
Calculate the total number of valence electrons by adding the contributions from each element:
Carbon: 4 electrons x 1 atom = 4 electrons.
Hydrogen: 1 electron x 3 atoms = 3 electrons.
Bromine: 7 electrons x 1 atom = 7 electrons.
Total = 4 + 3 + 7 = 14 electrons.
Determine the central atom. In CH3Br, carbon is the central atom.
Connect the central carbon atom to the surrounding hydrogen and bromine atoms using single bonds (each bond consists of two electrons).
Distribute the remaining valence electrons as lone pairs on the outer atoms to satisfy the octet rule. Hydrogen can only accommodate two electrons (a duet), and bromine can expand its octet.
Calculate the formal charges to ensure that the Lewis structure represents the most stable arrangement of electrons. In CH3Br, the formal charges should ideally be as close to zero as possible.
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silver?
To find the mole fraction of silver in the mixture, divide the moles of silver by the total moles of both elements.
To find the mole fraction of silver in the mixture, we need to calculate the moles of silver and iron. First, calculate the moles of silver by dividing the mass of silver by its molar mass. Then, calculate the moles of iron in the same way. Finally, find the mole fraction of silver by dividing the moles of silver by the total moles of both elements in the mixture.
Moles of silver = mass of silver / molar mass of silver
Moles of iron = mass of iron / molar mass of iron
Mole fraction of silver = moles of silver / (moles of silver + moles of iron)
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