Reacția de schimb - Quiz

Define the reaction of exchange.

Answer explanation

The reaction of exchange, also known as a double displacement reaction, occurs when two compounds exchange ions or bonds to form new compounds, typically resulting in the formation of a precipitate, gas, or water.

Recognize exchange reactions in chemical equations.

Answer explanation

Exchange reactions involve the swapping of components between two compounds, typically represented as AB + CD → AD + CB. Identifying these reactions helps in understanding chemical interactions and predicting products.

Write chemical equations for exchange reactions between acids, bases, and salts.

Answer explanation

Exchange reactions involve the reaction of an acid with a base to form a salt and water. For example, HCl + NaOH → NaCl + H2O illustrates this process.

Explain the conditions for the occurrence of exchange reactions.

Answer explanation

Exchange reactions occur when two compounds react to form two new compounds, typically requiring conditions like sufficient energy, proper orientation of molecules, and the presence of catalysts to facilitate the reaction.

Conduct and observe an experiment illustrating the reaction of exchange.

Answer explanation

To illustrate an exchange reaction, mix solutions of silver nitrate and sodium chloride. Observe the formation of a white precipitate of silver chloride, demonstrating the exchange of ions between the two compounds.

What happens when sodium sulfate reacts with barium chloride?

• Barium sulfate precipitates and sodium chloride forms.

• Sodium sulfate precipitates and barium chloride forms.

• No reaction occurs.

• Both reactants remain unchanged.

Answer explanation

When sodium sulfate reacts with barium chloride, barium sulfate precipitates out of the solution, while sodium chloride remains dissolved. This is a classic double displacement reaction.

What is the duration of the attention-capturing stage?

• 2 minutes

• 5 minutes

• 10 minutes

• 15 minutes

Answer explanation

The attention-capturing stage lasts for 5 minutes, which is the optimal duration to engage and maintain focus before transitioning to the next phase.

What resources are used during the announcement of the theme?

• Board and notebooks

• PPT

• Experiments

• Worksheets

Answer explanation

The correct choice, 'Board and notebooks', are essential resources for announcing the theme as they allow for clear writing and note-taking, facilitating effective communication and engagement during the announcement.

The exchange reaction is a chemical reaction in which there is a _______________ between two compounds, forming _______________.

• exchange

• new compounds

Answer explanation

The exchange reaction involves an exchange between two compounds, resulting in the formation of new substances. Thus, the correct term to fill in the first blank is 'exchange', indicating the nature of the reaction.

The conditions for the exchange reaction to occur are: - the formation of a _______________ - the formation of a _______________ - the formation of _______________.

• precipitate

• gas

• salt

Answer explanation

The exchange reaction requires the formation of a precipitate, which indicates that a solid product is formed from the reactants. While gas and salt can also form, the key condition here is the precipitate.