active growth and metabolism of the cell
Correct answer
reaction, while other conditions remain the same?
(1) The reacting particles have less energy and
collide less frequently.
(2) The reacting particles have less energy and
collide more frequently.
(3) The reacting particles have more energy and
collide less frequently.
(4) The reacting particles have more energy and
collide more frequently.
2 NaOH (s) + CO₂ (g) → Na₂CO₃ (s) + H₂O (l)
Explanation:
The most probably chemical reaction is:
2 NaOH (s) + CO₂ (g) → Na₂CO₃ (s) + H₂O (l)
Sodium Hydroxide (solid) + Carbon Dioxide (gas) → Sodium Carbonate (solid) + Water (gas)
In this reaction the water you obtain have to be in liquid form because the reaction takes place at room temperature. However because the student left the beaker for 24 hours, the water have a plenty of time to evaporate, so in the end only sodium carbonate (Na₂CO₃) remained in the beaker.
number of moles = mass / molar weight
number of moles of NaOH = 0.4 / 40 = 0.01 moles
Taking in account the chemical reaction, we devise the following reasoning:
if 2 moles of NaOH produce 1 mole of Na₂CO₃
then 0.01 moles of NaOH produce X mole of Na₂CO₃
X = (0.01 × 1) / 2 = 0.005 moles of Na₂CO₃
mass = number of moles × molar weight
mass of Na₂CO₃ = 0.005 × 106 = 0.53 g
mass of Na₂CO₃ = mass of beaker and its contents after 24h - mass of empty beaker
mass of Na₂CO₃ = 113.09 - 112.58 = 0.51 g which is close the theoretical value of 0.53 g.
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number of moles
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b. The positive charge on the nucleus of the ion is two units greater than the nuclear charge on the atom.
c. The ion has two more protons than the atom.
d. The ion will react more readily with free Cl₂. (E)The ion has two more planetary electrons than the atom. Can anyone explain this one?
The examples that represent potential energy are:
A. A candy bar
B. A stretched rubber band
D. A roller coaster at the top of a hill
It is the stored energy in any object or system by virtue of its position or arrangement of parts. This energy depicts zero motion or movement unlike kinetic energy. For example : A candy bar, stretched rubber band and roller coaster at the top of a hill all indicate positions without any said explanation of movement.
Thus, correct options are A, B and D.
Find more information about Potential energy here:
Answer:
A candy bar
A stretched rubber band
A roller coaster at the top of a hill
Explanation:
Potential energy is the energy present as a result of the position of an object. This energy depicts zero motion or movement unlike kinetic energy.
A candy bar, stretched rubber band and roller coaster at the top of a hill all indicate positions without any said explanation of movement.
The other option choices depicts a type of movement .This is why the three option choices are correct in this scenario.