Test on Mixtures and Compounds: Fundamentals

Question 1: When lettuce leaves are chopped, the atoms inside them are not rearranged, indicating a physical reaction.

A. Ano

B. Ne

Explanation: The study materials state that when you chop ingredients like lettuce leaves, the atoms inside them have not been re-arranged, and this is called a physical reaction.

Question 2: During the physical mixing of iron filings and sulfur powder, the atoms of the substances were rearranged.

A. Ano

B. Ne

Explanation: When iron filings and sulfur powder were stirred together, the atoms had not been rearranged; this was a physical change. Rearrangement of atoms occurred only when they were heated, forming a chemical compound.

Question 3: Based on the demonstration provided, under which condition can iron filings and sulfur powder be separated using a magnet?

A. When they are heated together, resulting in rearranged and bonded atoms.

B. After a chemical reaction has formed a new dark metal solid.

C. When they are simply stirred together and maintain their individual properties.

D. Once the yellow colour has disappeared, indicating a new substance has formed.

Explanation: The study material explains that when iron filings and sulfur powder were stirred together, they could easily be separated with a magnet because they maintained their individual properties and atoms were not rearranged. In contrast, heating them together caused a chemical reaction, forming a new substance that could not be separated by a magnet.

Question 4: Based on the study materials, which statement accurately describes why boiling an egg is considered a chemical reaction?

A. The atoms inside the egg are rearranged.

B. The substances maintain their original properties.

C. The change can usually be easily separated using physical methods.

D. It is an example of a physical reaction.

Explanation: The study materials explicitly state regarding boiling an egg that 'The atoms inside of them have been re-arranged. So we call this a chemical reaction.' This indicates that the rearrangement of atoms is the defining characteristic for classifying it as a chemical reaction.

Question 5: Do compounds possess the same properties as the elements from which they are formed?

A. Ano

B. Ne

Explanation: A compound has different properties to its individual elements.