Question

Comparing Appearance, Relative Density, and Solubility In this task, you’ll observe and compare the appearance, relative density, and solubility of common household materials in water. Part A Observe the appearance of each material before it is mixed, its relative density, and how well it dissolves in water. Baking Soda Baking Powder Salt Sugar Flour Vinegar Cooking Oil Part B What observation about baking powder suggests that it is a mixture of substances?

a) It dissolves completely in water.
b) It forms a homogeneous solution.
c) It shows visible particles when mixed with water.
d) It increases in density when mixed with water.

Answer 1

Baking powder shows visible particles when mixed with water, suggesting it is a heterogeneous mixture because it does not dissolve completely, allowing individual components to retain their own properties.

Step-by-step explanation:

When observing the properties of baking powder, we find that it can suggest the presence of a mixture of substances. Baking powder, unlike sodium chloride (table salt) which forms a homogeneous mixture when dissolved in water, exhibits different behavior. The observation that indicates baking powder is a mixture of substances is that it likely shows visible particles when mixed with water, which means it does not dissolve completely, forming a heterogeneous mixture, rather than a homogeneous one. This behavior can be attributed to the different substances in baking powder that do not all dissolve at the same rate or to the same extent, thereby allowing the individual components to retain their own identities and properties within the mixture.