4278416
Descripción
Test por Neil Patil, actualizado hace más de 1 año
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Creado por Neil Patil
hace casi 9 años
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Pregunta 1
Pregunta
What does le Chatelier's principle state?
Respuesta
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When a system in equilibrium is subjected to an external change, the system will readjust itself to minimise the effect of the change.
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When a system in equilibrium is subjected to an external change, the system will readjust itself to maximise the effect of the change.
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When a system in equilibrium is subjected to an internal change, the system will readjust itself to minimise the effect of the change.
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When a system in equilibrium is subjected to an internal change, the system will readjust itself to maximise the effect of the change.
Pregunta 2
Pregunta
Which of these affect the position of equilibrium?
Respuesta
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Changing the temperature.
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Changing the pressure.
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Adding a catalyst.
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Removing product.
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Removing reactant.
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Changing the concentration
Pregunta 3
Pregunta
In the Haber process, increasing the [blank_start]pressure[blank_end] will shift the equilibrium to the [blank_start]right[blank_end], because there are [blank_start]fewer[blank_end] moles of ammonia than moles of the [blank_start]reactants[blank_end]. However, this is expensive, so it is not economical to keep it high.
Respuesta
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pressure
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temperature
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right
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left
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fewer
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more
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reactants
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products
Pregunta 4
Pregunta
Symmetrical molecules are always polar.
Respuesta
- True
- False
Pregunta 5
Pregunta
Which of the following intermolecular forces occur between molecules of HCl?
Respuesta
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London forces
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Permanent dipole-dipole interactions
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Hydrogen bonds
Pregunta 6
Pregunta
Place the group 2 elements in order of ascending melting point: Si > [blank_start]Al[blank_end] > Mg > [blank_start]Na[blank_end] > [blank_start]S[blank_end] > [blank_start]P[blank_end] > [blank_start]Cl[blank_end] > Ar
Respuesta
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Al
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Na
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S
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P
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Cl
Pregunta 7
Pregunta
Giant metallic structures have higher melting points than giant covalent structures.
Respuesta
- True
- False
Pregunta 8
Pregunta
All sub shells in the 3rd shell are filled before the 4s sub shell starts to fill.
Respuesta
- True
- False
Pregunta 9
Pregunta
The molecule platinum hexafluoride (PtF6) has an octahedral shape.
Respuesta
- True
- False
Pregunta 10
Pregunta
Iron has the electron formation: 1s2 2s2 2p6 3s2...
Respuesta
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...3p6 3d8
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...3p6 3d6 4s2
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...3p6 3d8 4s2
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...3p6 4s8
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