From the same video as question #2, how did you observe carbon dioxide being formed as a product?
a
A solid precipitate was formed.
b
Gas bubbles formed and bubbled through the flask.
c
A color change occurred.
d
All of the above are signs that carbon dioxide formed.
d
All of the above are signs that carbon dioxide formed.
Based on the provided options, the correct answer is:
b) Gas bubbles formed and bubbled through the flask.
In the video, the observation of gas bubbles forming and bubbling through the flask is a direct indication that carbon dioxide gas is being formed as a product.
To observe carbon dioxide being formed as a product, you can refer to the same video or experiment mentioned in question #2. Here are the different ways you might observe carbon dioxide being formed:
a) A solid precipitate was formed: This means that after the reaction occurred, a solid substance was produced. However, the formation of a solid precipitate does not necessarily indicate the presence of carbon dioxide.
b) Gas bubbles formed and bubbled through the flask: If you notice gas bubbles being formed during the reaction and then rising or bubbling through the flask, this is a common sign that a gas is being released, which could be carbon dioxide.
c) A color change occurred: In some cases, the formation of carbon dioxide can be indicated by a color change in the reaction mixture. However, this is not always a definitive sign and could also be caused by other chemical reactions.
d) All of the above are signs that carbon dioxide formed: The most accurate statement would be that if you observe any combination of the above signs (solid precipitate formation, gas bubble formation, and color change), it is likely that carbon dioxide has been formed as a product.
To confirm the presence of carbon dioxide, it is best to conduct additional tests. For example, you can pass the gas produced through lime water (calcium hydroxide solution) and observe the formation of a white precipitate, which confirms the presence of carbon dioxide.