Kerja Lab Lanjut Quiz 3

You have a piece of copper bonded to a piece of silicon. Which of the two materials will expand more when the combined object is heated?

• silicon

• copper

• both expand the same

• silicon does not expand

You have a piece of E-glass bonded to a piece of silicon. Which of the two materials will expand more when the combined object is heated?

• E-glass

• silicon

• both expand the same

• silicon does not expand

You have a piece of E-glass bonded to a piece of copper. Which of the two materials will expand more when the combined object is heated?

• copper

• E-glass

• both expand the same

• copper does not expand

The equilibrium bond-length of NaCl is determined by a balance between a __ force of __ and a separate force of __.

• Coulombic; repulsion; repulsion

• Coulombic; attraction; repulsion

• Coulombic; attraction; attraction

• thermal; attraction; repulsion

When the two forces that are acting on the Na and Cl atoms (inside a NaCl crystal) balance each other, the crystal has __ energy.

• zero

• infinite

• the lowest

• the highest

The equilibrium bond length for NaCl (table salt) is __ nm.

• 2800

• 280

• 28

• 0.28

The Atomic-bonding Force curve presents the __, __ and __ forces acting on the atoms in a material, as a function of the __.

• ionic; covalent; van der Waals; interatomic-distance

• ionic; covalent; van der Waals; atomic-sizes

• attractive; repulsive; net; interatomic-distance

• attractive; repulsive; net; atomic-sizes

In the Atomic-bonding Force curve, the equilibrium separation between atoms occurs when the net force is __.

• positive

• negative

• infinite

• zero

The Atomic-bonding Potential-Well (for a given material) is visible in the plot of __ versus __ for that material.

• kinetic energy; interatomic separation

• kinetic energy; atomic size

• potential energy; atomic size

• potential energy; interatomic separation

The interatomic potential energy is given by the __ of the net-force curve with respect to __.

• slope; distance

• integral; distance

• slope; atomic size

• integral; atomic size