Question

1)

A liquid displays a convex meniscus in a graduated cylinder. What can be definitely said about the liquid?

The molecule must be nonpolar like water.

The liquid does not have strong intermolecular forces.

The adhesion forces between the liquid molecules and the graduated cylinder are greater than the cohesion forces between the liquid molecules.

The cohesion forces between the liquid molecules are greater than the adhesion forces between the liquid and the graduated cylinder.

There is not enough information availalbe to make interfences about the liquid.

2)

Consider amines. Which will exhibit the greatest boiling point (assuming molar masses are similar)?

Primary amine

Secondary amine

Tertiary amine

It is not possible to esimate this without more information.

They will exhibit the same (or similar) boiling points because their molar masses are so close.

3)

How many particles are present in a face-centered cubic unit cell?

1

2

4

8

12

Answer 1

1) A liquid displays a convex meniscus in a graduated cylinder. What can be definitely said about the liquid?

Answer : The cohesion forces between the liquid molecules are greater than the adhesion forces between the liquid and the graduated cylinder.

2) Consider amines. Which will exhibit the greatest boiling point (assuming molar masses are similar)?

Answer : Primary amine

3) How many particles are present in a face-centered cubic unit cell?

Answer : 4 particles.

each face is shared with two unit cells and cubic unit cell has 6 faces. Then number of particles = 6*1/2 = 3 atoms.

Number of atoms from corners = 8*1/8 = 1 atom.

Total number of particles = 4 particles.