Question
1. Is a chemical element the same as a chemical compound? Explain.
Is a chemical element the same as a chemical compound? Explain. Yes, a chemical compound is the same as a chemical element. No, a chemical compound is a combination of chemical elements. No, a chemical compound and a chemical element have nothing in common. Can the element iron (Fe) be changed to gold (Au) by heating it to a high enough temperature? Explain. Yes, at high temperatures iron chemically reacts to form gold. No, iron can be melted but upon cooling it will still be iron. There is not enough information to determine the answer. When a substance is burned, are all of the products of that reaction solid substances that can be easily weighed? Yes, because mass is conserved in a chemical reaction, all the products may be collected and easily weighed. No, some of the mass may be destroyed through the reaction so not all the products are present to be easily weighed. No, while solid substances can be collected and easily weighed, gaseous substances cannot. Are the hydrogen and oxygen needed in fuel cells available in isolated forms or do they have to be extracted from compounds? (See the everyday phenomenon box.) Hydrogen exists in large amounts in isolated form on Earth, but oxygen does not. Oxygen exists in large amounts in isolated form on Earth, but hydrogen does not. Both hydrogen and oxygen exist in large amounts in isolated form on Earth. Neither hydrogen nor oxygen exist in large amounts in isolated form on Earth. Is mass conserved in a chemical reaction? Yes No
Explanation / Answer
1) No, a chemical compound is a combination of chemical elements
2) No, iron can be melted but upon cooling it will still be iron.
3) No, while solid substances can be collected and easily weighed, gaseous substances cannot.
4) Neither hydrogen nor oxygen exist in large amounts in isolated form on Earth.
5) Yes
