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Questions and Answers
Why is distillation an effective method for purifying seawater?
Why is distillation an effective method for purifying seawater?
- Distillation converts the salts into gases that escape into the atmosphere.
- Distillation uses a chemical reaction to break down the salt compounds.
- Distillation neutralizes the harmful salts present in seawater.
- Distillation involves heating the seawater to evaporate the water, leaving the salts behind. (correct)
In the context of atmospheric chemistry, what is the primary role of chlorofluorocarbons (CFCs)?
In the context of atmospheric chemistry, what is the primary role of chlorofluorocarbons (CFCs)?
- CFCs catalyze the breakdown of ozone molecules in the stratosphere. (correct)
- CFCs reflect harmful UV radiation away from the Earth.
- CFCs absorb excess carbon dioxide, reducing global warming.
- CFCs help in the formation of the ozone layer.
Why does chlorine act as a bleaching agent in the presence of water?
Why does chlorine act as a bleaching agent in the presence of water?
- Chlorine directly oxidizes the colored substances.
- Chlorine reacts with water to form hydrochloric acid, which breaks down the colored substances.
- Chlorine dehydrates the colored substances, causing them to lose their color.
- Chlorine reacts with water to form hypochlorous acid, which oxidizes colored substances. (correct)
How does fractional distillation separate different fractions of petroleum?
How does fractional distillation separate different fractions of petroleum?
Consider two isotopes of the same element. If isotope A has a greater number of neutrons than isotope B, what statement must be true?
Consider two isotopes of the same element. If isotope A has a greater number of neutrons than isotope B, what statement must be true?
Flashcards
Laughing Gas
Laughing Gas
Nitrous oxide (Nâ‚‚O) gas, when inhaled, produces euphoria.
Distillation
Distillation
The process of vaporizing a liquid and then condensing the vapor. Used to purify seawater.
Chlorofluorocarbons (CFCs)
Chlorofluorocarbons (CFCs)
Gases containing chlorine, fluorine, and carbon that contribute to ozone depletion.
Water Softening
Water Softening
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Sublimation
Sublimation
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Study Notes
Chemistry MCQs 2024
- Nitrous oxide gas is commonly known as Laughing Gas.
- Seawater can be purified through distillation.
- Chlorofluorocarbons (CFCs) are responsible for the depletion of the ozone layer.
- Oxygen is the most abundant element in the Earth's crust.
- The process of removing calcium and magnesium from hard water is known as water softening.
- A mixture of water and alcohol can be separated by distillation.
- Sublimation is the process of converting a solid directly into a gas.
- Ethane reacts with chlorine in the presence of sunlight.
- Minamata disease is caused by Mercury.
- Chlorine acts as a bleaching agent in the presence of water (H2O).
- A catalyst increases the rate of a chemical reaction.
- Petroleum is a mixture of various hydrocarbons.
- Different fractions of petroleum are separated by fractional distillation.
- Ozone depletion can lead to skin cancer.
- Evaporation is the process of converting a liquid into a gas.
- Pascal is the SI unit of pressure.
- Methane is the main component of natural gas.
- NaCl is the chemical formula for table salt
- The nucleus of an atom consists of protons and neutrons.
- A neutral solution has a pH value of 7.
- A neutron has the greatest mass among electrons, protons, and neutrons.
- Vitamin A is soluble in fats.
- Vitamin B is soluble in water.
- Nitrogen is the major component of the troposphere.
- Chemical properties of isotopes must be the same.
- The coldest region of the Earth's atmosphere is the mesopause.
- Acids release hydrogen ions in water.
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