Analysis questions:
A) What evidence is there that the gas bubbles formed in the first part of the investigation were hydrogen gas?
Answer: Evidence there was that proved that the gas bubbles formed in the first part of the investigation were hydrogen gas is that there was this popping noise and it was igniting.
-I was not quite that sure of what else to add in my answer, so if u could add to this, then I will be very thankful to you.
B) The reaction of zinc metal and hydrochloric acid creates hydrogen gas, an element. what property of this element requires u to keep the second tube upside down.
Answer: Property of this element which requires u to keep the second tube upside down is that it can be reactive depending on the kind of atmosphere around.
C) What evidence is there that the compound formed in the second test tube is water?
C) It is water because appears as a clear liquid.
D) Water has the chemical formula H2O. Where did the hydrogen (H) and oxygen (O) atoms required to form the water molecules come from?
Answer: Not sure.
E) Did the investigation verify ur prediction? Explain.
Answer: Yes, the invesigation verified my prediction becuase it proved that an element van be separated from a compound and that an element can form a compound.
A) What evidence is there that the gas bubbles formed in the first part of the investigation were hydrogen gas?
Answer: Evidence there was that proved that the gas bubbles formed in the first part of the investigation were hydrogen gas is that there was this popping noise and it was igniting.
-I was not quite that sure of what else to add in my answer, so if u could add to this, then I will be very thankful to you.
I wouldn't add anything to it; however, I think I would rephrase your response. The first part sounds down right clumsy. Something like, "Evidence that the gas bubbles were hydrogen was provided by ....."
B) The reaction of zinc metal and hydrochloric acid creates hydrogen gas, an element. what property of this element requires u to keep the second tube upside down.
Answer: Property of this element which requires u to keep the second tube upside down is that it can be reactive depending on the kind of atmosphere around.
NO. That is not a good answer. The reason you keep the test tube upside down is because hydrogen gas is lighter than air; a test tube filled with hydrogen gas but right side up allows the hydrogen gas to exit the top (float out the top). Just for your information, hydrogen gas is the lightest element known.
C) What evidence is there that the compound formed in the second test tube is water?
C) It is water because appears as a clear liquid. Do you mean colorless liquid? Is water the ONLY colorless liquid you know? I don't think so. There are many colorless liquids in addition to water. I thought you used the CoCl2 paper to test for water. Regarding the use of clear versus colorless, my comments are as follows:
Clear means it has no sediment; colorless means it has no color.
D) Water has the chemical formula H2O. Where did the hydrogen (H) and oxygen (O) atoms required to form the water molecules come from?
Answer: Not sure.
Didn't the hydrogen gas come from the reaction of Zn and HCl? Didn't the oxygen come from the air (at the mouth of the test tube)?
E) Did the investigation verify ur prediction? Explain.
Answer: Yes, the investigation verified my prediction because it proved that an element can be separated from a compound and that an element can form a compound.
I can help you with some more information for your answers:
A) In addition to the popping noise and ignition, another evidence that the gas bubbles formed were hydrogen gas is its characteristic property of being lighter than air. If you had collected the gas in a test tube and then inverted it, you would have seen the gas rise and fill up the upper portion of the tube. This behavior is typical of hydrogen gas, which is less dense than air.
B) The property of hydrogen gas that requires the second tube to be kept upside down is its high flammability or reactivity in the presence of oxygen. By keeping the tube upside down, any air that might be present inside the tube is displaced by the hydrogen gas, reducing the likelihood of an explosion or rapid reaction if the hydrogen comes into contact with atmospheric oxygen.
C) In addition to its appearance as a clear liquid, another evidence that the compound formed in the second test tube is water is its ability to evaporate and form water vapor when heated. If you had heated the test tube, you would have observed the water vapor rising and condensing on a cool surface.
D) The hydrogen (H) and oxygen (O) atoms required to form water molecules came from the reactants used in the reaction, which were zinc metal (Zn) and hydrochloric acid (HCl). In the reaction, zinc atoms (Zn) from the metal combine with hydrogen ions (H+) from the hydrochloric acid to form hydrogen gas (H2), while the remaining chlorine ions (Cl-) combine with the zinc to form zinc chloride (ZnCl2).
E) Your answer is correct. The investigation did verify your prediction as it demonstrated that an element, in this case, hydrogen, can be separated from a compound (hydrochloric acid) through a single displacement reaction. It also showed that hydrogen, as an element, can combine with another element, in this case, oxygen from the air, to form a compound, water.
A) What evidence is there that the gas bubbles formed in the first part of the investigation were hydrogen gas?
To provide a more complete answer, we can include additional evidence that supports the identification of the gas bubbles as hydrogen gas. One important evidence is the observation of a popping or explosive sound when the gas bubbles were ignited. This popping sound is characteristic of hydrogen gas, which has a high reactivity and easily ignites when exposed to a flame. Another evidence could be the observation of the gas burning with a blue flame, which is a typical characteristic of hydrogen gas combustion.
B) The reaction of zinc metal and hydrochloric acid creates hydrogen gas, an element. What property of this element requires you to keep the second tube upside down?
The property of hydrogen gas that requires keeping the second tube upside down is its low density. Hydrogen gas is lighter than air, meaning it has a lower density than the surrounding atmosphere. Therefore, if the second tube is kept upright, the hydrogen gas would rise and escape from the tube. By keeping it upside down, the hydrogen gas is trapped within the tube, allowing it to be collected for further analysis.
C) What evidence is there that the compound formed in the second test tube is water?
Besides the observation that the compound appears as a clear liquid, there are additional pieces of evidence that support the conclusion that the compound formed is water. One important evidence is the absence of any fizzing or gas liberation when the clear liquid was formed. Since the reaction between hydrogen gas and oxygen gas (or compounds containing oxygen, like water) typically results in the release of gas, the absence of gas formation supports the conclusion that water was formed. Additionally, the liquid's ability to dissolve substances, like salt or sugar, and its behavior when it evaporates or freezes further confirm its identity as water.
D) Water has the chemical formula H2O. Where did the hydrogen (H) and oxygen (O) atoms required to form the water molecules come from?
In the context of your investigation, the hydrogen and oxygen atoms required to form the water molecules come from the reactants involved in the reaction. Specifically, the hydrogen gas (H2) is provided by the zinc metal and hydrochloric acid, while the oxygen gas (O2) needed to form water might have been present in the air. The hydrogen gas, generated from the reaction between the zinc metal and hydrochloric acid, combines with the oxygen gas (either from the air or generated within the system) to form water molecules (H2O).
E) Did the investigation verify your prediction? Explain.
Based on the information provided, it seems that the investigation did verify your prediction. Your prediction was that an element can be separated from a compound, and that an element can form a compound. The observation of gas bubbles (hydrogen gas) being formed and then collected in the first part of the investigation supports the idea that an element (hydrogen) can be separated from a compound (e.g., hydrochloric acid). Additionally, the formation of water in the second test tube demonstrates that when the hydrogen gas (element) reacts with oxygen gas (also an element), a compound (water) can be formed. Therefore, the investigation validates your prediction.