Question

1. when a substance undergoes a physical change, there will be a rearrangement of the atoms and thus make new compounds.

a. true
b. false

1. which answer best describes the classification of liquids in this picture?

a. solution
b. homogenous mixture
c. suspension
d. colloid

1. what is the correct definition for matter?

a. the mass of an object compared to its volume
b. it is a substance comprised of two or more elements
c. the ability or tendency to float on top of water
d. anything that has mass and occupies space

1. what type of change has occurred if, after the change, the substance maintains its original identity?

a. physical change
b. chemical change
c. no change at all
d. i don’t know… ¯\\_(ツ)_/¯

Explanation:

• Question 6: In a physical change, there is no rearrangement of atoms to form new compounds. For example, melting ice (water in solid state to liquid state) is a physical change where the water molecules (\(H_2O\)) remain the same.
• Question 7: A suspension is a heterogeneous mixture where solid particles (like sand) are dispersed in a liquid (water) and can settle out. Olive oil and water do not mix well (they are immiscible), and sand in water is a classic suspension example. A solution is a homogeneous mixture (e.g., salt - water where salt dissolves completely). A colloid has particles smaller than in a suspension but larger than in a solution (e.g., milk). A homogeneous mixture has a uniform composition throughout.
• Question 8: Matter is defined as anything that has mass and occupies space. Option a is the definition of density (\(

ho=\frac{m}{V}\)). Option b is the definition of a compound. Option c is the definition of buoyancy.

• Question 9: In a physical change, the substance retains its chemical identity. For example, cutting paper is a physical change - it is still paper. In a chemical change, new substances are formed (e.g., burning paper to form ash, carbon dioxide, etc.).

Answer:

• 6) b. False
• 7) c. Suspension
• 8) d. Anything that has mass and occupies space
• 9) a. Physical change