Molecular Properties of Matter II Lowersixth Science Physics

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Explore forces and energy in molecules.

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YAKILI LMS

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Molecular Properties of Matter II Lowersixth Science Physics


Froggy Jumps Molecular Properties of Matter II Lowersixth Science PhysicsOnline version Explore forces and energy in molecules. by YAKILI LMS 1 What does a force–separation curve show? a Energy as function of time b Force as function of separation distance c Velocity vs. distance 2 At the point of equilibrium on a force–separation curve, the force is a Minimum nonzero b Zero c Maximum 3 What determines the depth of the potential well in intermolecular forces? a Ambient pressure b Strength of attraction between molecules c Molar mass of molecules 4 Which term best describes the energy needed to separate two molecules at infinite distance? a Activation energy b Kinetic energy c Cohesive energy 5 Intermolecular potential energy curves primarily concern a Forces between molecules b Gravitational forces c Nuclear forces 6 Which curve shape is typical for Lennard-Jones potential? a Monotonic increase b Always zero c Has a minimum at a finite separation 7 What happens to potential energy as molecules move far apart in an attractive potential? a It approaches zero b Goes to infinity c Becomes negative unbounded 8 In solids, molecular theory explains properties mainly via a Color of the material b Ambient humidity c Interactions between particles 9 Which property is linked to molecular bonding in solids? a Color b Taste c Hardness 10 What does a steeper repulsive wall in a potential curve indicate? a Strong short-range repulsion b No repulsion c Weak attraction at all distances 11 Which energy term is associated with bringing two molecules from infinity to contact? a Thermal energy b Kinetic energy c Potential energy of interaction 12 Which factor most affects the separation curve for two molecules? a Nuclear composition b Intermolecular forces c Electrical wiring in lab 13 The equilibrium separation corresponds to the minimum of which quantity? a Total energy b Kinetic energy c Potential energy 14 In solids, molecules are typically arranged in a Isolated atoms only b A lattice or short-range order c Gases with large gaps 15 What is a key implication of molecular theory for solids? a Rigor of structure from interactions b Solids do not interact c All solids are liquids 16 Which term describes the energy barrier to separate two particles completely? a Activation energy b Bond dissociation energy c Thermal energy 17 Intermolecular forces are typically ______ than intramolecular forces. a Weaker b Stronger c Equal 18 Which curve feature indicates attraction at moderate distances? a Only positive values b A flat line c A negative slope before the minimum 19 What does the term 'potential energy curve' primarily plot? a Velocity vs distance b Time vs energy c Energy vs separation 20 Which solid property can be explained by molecular theory? a Mechanical stiffness b Gas-like behavior c Color only 21 The distance at which the net force is zero is called the a Dissociation distance b Equilibrium separation c Zero-force point 22 In a simplified potential, what happens as distance decreases below equilibrium? a Attractive force increases b Repulsive force increases c No force acts 23 Which describes an intermolecular potential well? a Maximum energy at contact b Minimum energy at a finite separation c No energy change with distance 24 Solids from molecular theory emphasize a Arrangement and bonding of particles b Only bulk properties c Only external shape 25 What primarily defines the stiffness of a solid in molecular terms? a Particle numbers alone b Strength of interparticle forces c Ambient temperature 26 Which term describes the energy to extend a solid lattice? a Kinetic energy b Elastic potential energy c Thermal energy 27 Intermolecular potentials: short-range repulsion is due to a Pauli exclusion and electron overlap b Thermal fluctuations c Gravitational attraction 28 Which quantity is NOT typical in a force–separation discussion? a Force b Distance c Molecular color 29 Which statement best describes the Lennard‑Jones model? a Repulsion at short range and attraction at moderate range b Pure attraction at all ranges c No interaction 30 What does a less steep repulsive wall imply? a No attraction present b Molecule cores can get closer before strong repulsion c Repulsion dominates completely 31 Which parameter is crucial for solids’ hardness in molecular terms? a Surface roughness only b Depth and width of the potential well c Ambient humidity 32 Which is a direct outcome of stronger intermolecular forces? a Faster diffusion b Higher melting point c Lower density 33 What is the role of potential energy curves in phase changes? a Predict color changes b Describe energy barriers and stability c Set atmospheric pressure 34 Which term is used for energy stored by deformation in solids? a Elastic potential energy b Kinetic energy c Chemical energy 35 What happens when separation goes to infinity in an attractive potential? a Goes to infinity b Potential energy approaches zero c Remains negative 36 Which factor primarily governs the separation curve shape? a Nuclear reactions b Intermolecular forces c Earth's gravity 37 In solids, molecular theory helps explain a Why liquids flow b Why gases expand c Why solids have definite shapes 38 Which of the following is a characteristic of a stable equilibrium? a Small displacements increase potential energy b Displacements reduce energy c Energy constant 39 Intermolecular potential energy curves are used to study a Bonding and stability in materials b Electrical circuits c Planetary motion 40 What is the primary cause of solid rigidity in molecular terms? a Strong interparticle attractions b Low mass c High thermal energy 41 At the minimum of the potential well, the system is a Inconsistent b Most stable with respect to separation c Unstable 42 Which statement about forces between molecules is true? a They are always repulsive b They are always attractive c They can be attractive or repulsive depending on distance 43 Which quantity is a direct consequence of a deeper potential well? a Stronger binding b Faster diffusion c Lower melting point 44 What does the 'separation' axis measure in the curve? a Distance between two molecules b Temperature difference c Time between collisions 45 Which is a hallmark of a good molecular solid model? a Inaccurate mass b Ignoring temperatures c Accurate prediction of phase behavior 46 Which term describes the energy required to overcome attractive forces at a set separation? a Thermal threshold b Kinetic energy barrier c Potential energy barrier 47 A solid’s properties can be explained by a Arrangement and interactions of molecules b Remote astronomical effects c External color alone 48 Which concept links microscopic forces to macroscopic hardness? a Intermolecular bonding strength b Sample mass c Ambient color 49 What does the term 'equilibrium separation' mean? a Distance where net force is zero b Greatest distance reached c Distance of contact only 50 Which curve feature indicates attraction at long range? a Negative slope leading to minimum b Zero slope everywhere c Positive constant value

Molecular Properties of Matter II Lowersixth Science Physics

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Molecular Properties of Matter II Lowersixth Science PhysicsOnline version

by YAKILI LMS

What does a force–separation curve show?

At the point of equilibrium on a force–separation curve, the force is

What determines the depth of the potential well in intermolecular forces?

Which term best describes the energy needed to separate two molecules at infinite distance?

Intermolecular potential energy curves primarily concern

Which curve shape is typical for Lennard-Jones potential?

What happens to potential energy as molecules move far apart in an attractive potential?

In solids, molecular theory explains properties mainly via

Which property is linked to molecular bonding in solids?

What does a steeper repulsive wall in a potential curve indicate?

Which energy term is associated with bringing two molecules from infinity to contact?

Which factor most affects the separation curve for two molecules?

The equilibrium separation corresponds to the minimum of which quantity?

In solids, molecules are typically arranged in

What is a key implication of molecular theory for solids?

Which term describes the energy barrier to separate two particles completely?

Intermolecular forces are typically ______ than intramolecular forces.

Which curve feature indicates attraction at moderate distances?

What does the term 'potential energy curve' primarily plot?

Which solid property can be explained by molecular theory?

The distance at which the net force is zero is called the

In a simplified potential, what happens as distance decreases below equilibrium?

Which describes an intermolecular potential well?

Solids from molecular theory emphasize

What primarily defines the stiffness of a solid in molecular terms?

Which term describes the energy to extend a solid lattice?

Intermolecular potentials: short-range repulsion is due to

Which quantity is NOT typical in a force–separation discussion?

Which statement best describes the Lennard‑Jones model?

What does a less steep repulsive wall imply?

Which parameter is crucial for solids’ hardness in molecular terms?

Which is a direct outcome of stronger intermolecular forces?

What is the role of potential energy curves in phase changes?

Which term is used for energy stored by deformation in solids?

What happens when separation goes to infinity in an attractive potential?

Which factor primarily governs the separation curve shape?

In solids, molecular theory helps explain

Which of the following is a characteristic of a stable equilibrium?

Intermolecular potential energy curves are used to study

What is the primary cause of solid rigidity in molecular terms?

At the minimum of the potential well, the system is

Which statement about forces between molecules is true?

Which quantity is a direct consequence of a deeper potential well?

What does the 'separation' axis measure in the curve?

Which is a hallmark of a good molecular solid model?

Which term describes the energy required to overcome attractive forces at a set separation?

A solid’s properties can be explained by

Which concept links microscopic forces to macroscopic hardness?

What does the term 'equilibrium separation' mean?

Which curve feature indicates attraction at long range?