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.