This flask originally held some copper wire and a clear solution of nitric acid. The two substances reacted and produced a brown gas and a blue solution. This reaction cannot be reversed. Evidence of a chemical reaction is shown by...
A) ice forming.
B) steam rising.
C) the formation of a gas.
D) a change in state from a solid to a liquid.
Is it "C?" I'm guessing that is the correct answer. If anybody can, please explain it to me so I won't have to ask again. Thank you.
yes it is c because When the copper wire is held in clear solution of nitric acid brown colored gas was released with change in color of the solution. Both these ... so it is c a formation of gas hope this helped
Yes, you are correct. The evidence of a chemical reaction in this scenario is the formation of a gas, which is option C.
When the copper wire reacts with the nitric acid, it undergoes a chemical change, resulting in the production of a brown gas and a blue solution. This gas is a product of the reaction and indicates that a chemical reaction has occurred.
Option A, ice forming, is not the correct answer because the reaction described does not involve a change in temperature that would cause water to freeze.
Option B, steam rising, is also not the correct answer because the reaction does not involve the evaporation of water or any other liquid.
Option D, a change in state from a solid to a liquid, is not applicable in this case because the reaction does not involve a change in the physical state of a substance from solid to liquid.
Therefore, option C, the formation of a gas, is the correct answer to the question.
Yes, you are correct. The evidence of a chemical reaction in this scenario is given by option C) the formation of a gas.
To understand why the formation of a gas indicates a chemical reaction, let's break it down. In a chemical reaction, atoms or molecules rearrange to form new substances. This rearrangement involves breaking and forming chemical bonds. As a result, one or more new substances are produced.
In this case, the original flask contained copper wire and nitric acid. When the two substances reacted, they produced a brown gas and a blue solution. This gas is a new substance different from the copper wire and nitric acid. Its formation indicates that a chemical change has occurred.
When chemical bonds are broken and new bonds are formed, energy is usually involved. This means that the reaction often results in the release or absorption of energy, which can be in the form of heat, light, sound, or other forms. However, the release or absorption of energy is not specifically mentioned in this question.
Now let's briefly analyze the other answer options to understand why they are not correct:
A) Ice forming: Ice formation is a physical change, not a chemical change. It involves the change of water from a liquid to a solid state due to a decrease in temperature.
B) Steam rising: Similarly, the rising of steam is a physical change indicating the conversion of water from a liquid to a gaseous state due to heating.
D) A change in state from a solid to a liquid: This refers to a physical change, such as ice melting into liquid water, without any chemical reaction occurring.
In summary, the formation of a gas (option C) is the most appropriate evidence for a chemical reaction taking place in this scenario.