University Physical Chemistry

Which of the following are NOT signs that a chemical reaction occured?

• the properties changed
• bubbles of gas formed
• color stays the same
• smells different

The shaded area in the figure represents

• Plane of Symmetry

• Axis of Symmetry

• Diagonal Plane of Symmetry

• Centre of Symmetry

• Relation between chemical activity and activity coefficient

• Relation between chemical potential and ionic strength

• Relation between chemical potential and chemical activity

• Debye-Huckel Limiting Law

Alex wants to mix two substances together and to find out if a chemical reaction happens. What should he do?

• test the solubility before and after mixing
• measure the volume before and after mixing
• measure the mass before and after mixing
• test the density of the before substance but not the after substances.

X-ray diffraction is used for the determination of crystal structures because

• It is easy to focus X-ray.

• X-rays can penetrate thick specimens.

• X-rays can have wave lengths comparable to or shorter than the spacing between atomic planes.

• X-rays are invisible.