Learn more about the properties, composition, and structure of substances (elements and compounds) with these Chemistry questions and answers. This Test can be used by students preparing for Chemistry in JAMB, WAEC, NECO or Post UTME.
Chlorine gas is commonly used in the production of which of the following industrial compounds?
Chlorofluorocarbons (CFCs)
Methane
Ammonia
Ethanol
Correct answer is A
Chlorine gas is used in the production of chlorofluorocarbons (CFCs), which were once widely used as refrigerants, aerosol propellants, and foam-blowing agents. However, due to their harmful impact on the ozone layer, their use has been significantly reduced.
What unit of temperature should be used when applying the ideal gas law?
Fahrenheit (°F)
Kelvin (K)
Rankine (°R)
Celsius (°C)
Correct answer is B
Temperature must be expressed in Kelvin when using the ideal gas law. The Kelvin scale is an absolute temperature scale, and its zero point (0 K) corresponds to absolute zero, the point at which the kinetic energy of gas particles is minimal.
Which halogen is a gas at room temperature and is pale yellow in color?
Chlorine (Cl)
Fluorine (F)
Iodine (I)
Bromine (Br)
Correct answer is B
Fluorine is a halogen that is a gas at room temperature and is pale yellow in color. Halogens are a group in the periodic table consisting of five chemically related elements: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At). Among these, only Fluorine and Chlorine are gases at room temperature, but Chlorine is greenish-yellow, not pale yellow.
The heat of reaction can be determined experimentally using a device called a
Calorimeter
Barometer
Spectrometer
Thermometer
Correct answer is A
A calorimeter is a device used to measure the heat of reaction experimentally. It is designed to isolate the reaction from the surroundings and measure the temperature change in the surroundings to calculate the heat exchanged.
What is the mass (in grams) of 500 mL of ethanol? (density of ethanol = 0.789 g/mL)
394.5 mL
500 mL
394.5 g
500 g
Correct answer is C
To calculate the mass of a substance, we can use the formula:
Mass = Volume x Density
Given the volume of ethanol is 500 mL and the density of ethanol is 0.789 g/mL, we can plug the values into the formula:
Mass = 500 mL x 0.789 g/mL = 394.5 g
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