Which of the following halogens primarily purple in color? fluorine chlorine bromine iodine Which of the following gases is responsible for the rotten eggs smell? SO2 NH3 CO2 H2S Which of the following gases has an odor of a freshly struck and flaming match head? SO2 NH3 CO2 H2S Predict the insoluble compound that is formed from the reaction below. Write out the compound name (not its chemical formula) NaCl(aq) – AgNO3(aq) What physical observation would be observed after performing the following reaction? NaCl(aq) – Cl2(aq) NaCl(aq) I2(s) Nothing: No reaction will take place. A white precipitate will form. A black precipitate will form. An odor of rotten eggs will be produced.
The Correct Answer and Explanation is:
Here are the correct answers for each of your questions:
- Which of the following halogens is primarily purple in color?
- Answer: Iodine.
- Explanation: Iodine, in its solid form, appears as a dark purple to violet color. When sublimed into a gas, iodine also has a purple vapor. This characteristic color is distinct among the halogens. Fluorine is pale yellow, chlorine is greenish-yellow, and bromine is reddish-brown.
- Which of the following gases is responsible for the rotten eggs smell?
- Answer: H2S (Hydrogen Sulfide).
- Explanation: Hydrogen sulfide is notorious for its strong odor, resembling that of rotten eggs. It is often released during the decay of organic matter, or in industrial processes like petroleum refining. The other gases listed (SO2, NH3, and CO2) have distinct odors, but none of them resemble the smell of rotten eggs.
- Which of the following gases has an odor of a freshly struck and flaming match head?
- Answer: SO2 (Sulfur Dioxide).
- Explanation: Sulfur dioxide has a pungent, sharp odor similar to that of a freshly struck match. This is because sulfur is a key component in the match head. NH3 (ammonia) has a sharp, pungent odor, while CO2 is odorless, and H2S smells like rotten eggs.
- Predict the insoluble compound that is formed from the reaction below. Write out the compound name (not its chemical formula):
- Reaction: NaCl(aq) + AgNO3(aq) → AgCl(s) + NaNO3(aq)
- Answer: Silver chloride.
- Explanation: The reaction between sodium chloride and silver nitrate forms silver chloride (AgCl) as a white precipitate. This is because silver chloride is insoluble in water, unlike sodium nitrate, which remains dissolved in solution.
- What physical observation would be observed after performing the following reaction?
- Reaction: NaCl(aq) + Cl2(aq) → NaCl(aq) + I2(s)
- Answer: A black precipitate will form.
- Explanation: In this reaction, iodine (I2) is displaced by chlorine (Cl2) from an aqueous solution of sodium chloride. Iodine, in its elemental form, is a solid and appears as a black precipitate. This reaction is an example of a redox displacement reaction, where chlorine is a stronger oxidizer than iodine and displaces it from the compound.
