General Chemistry I Quiz

Which of the following compounds will have fixed volume and shape?

• Oxygen

• Water

• Diamond

• Ethanol

I2(s) → I2(g) is a:

• Evaporation process

• Condensation process

• Sublimation process

• Freezing process

To transform solid Naphthalene into vapor Naphthalene, one can:

• Increase the environment temperature

• Increase the environment pressure

• Decrease the environment temperature

• Decrease the environment pressure

In the laboratory, Bromine (liquid) is stored in a dark glass bottle. During the storage at ambient conditions (room temperature and atmospheric pressure), a student observes that the volume of bromine is progressively decreased. Which of the following reasons could cause the loss of bromine volume?

• Br2 reacts with O2

• Br2 reacts with H2O (water vapor) in the air

• Br2 liquid transforms into Br2 vapor which leaks out the bottle

• Someone drinks it

What could be the physical state of CO2 at the pressure of 100 atm and temperature of 0°C?

• Gas

• Liquid

• Solid

• Supercritical fluid

A student at USTH (CECS Laboratory) synthesized MoS2 - an attractive alternative to the Pt catalyst for the H2 evolution reaction - via the reaction between Mo(CO)6 and S. Excess S could be incorporated within the MoS2 product as impurity. To wash out S impurity (thus, to eliminate S impurity to obtain pure MoS2 product) which of the following solvents will be the best option?

• Water (H2O)

• CS2

• Methanol (CH3OH)

• Isopropanol (C3H7OH)

Mixing Water (polar compound), Ethanol (polar compound) and Benzene (non-polar compound) will provide:

• a compound

• an element

• a homogeneous mixture

• a heterogeneous mixture

H2 reacts with N2 generating NH3. This process is:

• a chemical process

• a physical process

• a biological process

Dissolving sugar (glucose) into water is

• a chemical process

• a physical process

• a biological process

Sulfuric acid (H2SO4) is:

• A heterogeneous mixture

• A homogeneous mixture

• A compound

• An element