Question: Which of the following is a pure substance made up of one type of atoms?
Incorrect Answer
Correct Answer An element is defined as a pure substance made up of one type of atoms and cannot be further subdivided into simpler substances by any physical or chemical means.
Question: Stainless steel is a an alloy of _______, _______, chromium, and nickel.
Incorrect Answer
Correct Answer Stainless steel is a mixture (alloy) of iron, carbon, chromium, and nickel. Carbon gives hardness to the mixture. Chromium and nickel give a silvery look to the mixture.
Question: Which of the following is a pure substance made up of two or more types of atoms or elements?
Incorrect Answer
Correct Answer A compound is defined as a pure substance made up of two or more types of elements (atoms) chemically combined in a fixed proportion, and it can be further subdivided into simpler substances by chemical means only.
Question: Copper sulfate can be further subdivided into simpler substances by chemical means only. Therefore, it is...?
Incorrect Answer
Correct Answer Copper sulfate is a pure substance made up of two types of elements (atoms) chemically combined in a fixed proportion, and it can be further subdivided into simpler substances by chemical means only. Therefore, it is a compound.
Question: Which of the following is an impure substance made up of two or more types of atoms or elements?
Incorrect Answer
Correct Answer A mixture is defined as an impure substance made up of two or more types of elements (atoms) or compounds or both mechanically mixed in any proportion, and it can be further subdivided into simpler substances by physical (mechanical) means.