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Which combination of substances is a compound?

A) A) A salt and water stirred in a glass
B) B) Food coloring in frosting
C) C) Peanut butter and jelly sandwich
D) D) Sulfur dioxide and water forming acid rain

User Erion S
by
8.2k points

1 Answer

5 votes

Final answer:

The correct combination of substances that forms a compound is D) Sulfur dioxide and water forming acid rain, where a chemical reaction between sulfur dioxide and water results in the formation of sulfuric acid, a compound.

Step-by-step explanation:

To classify the combination of substances that forms a compound, we look for a substance that is made up of two or more different elements chemically combined in a fixed ratio. Reviewing the options provided:

  • A) Salt and water stirred in a glass is a homogeneous mixture (solution), not a compound, because the salt can be physically separated from the water.
  • B) Food coloring in frosting is another example of a homogeneous mixture.
  • C) A peanut butter and jelly sandwich is a heterogeneous mixture, as it consists of different components that are easily identifiable and not chemically combined.
  • D) Sulfur dioxide and water forming acid rain represents the formation of a compound since sulfur dioxide (SO2) chemically reacts with water (H2O) to form sulfuric acid (H2SO4), which is a compound.

Therefore, the correct answer is D) Sulfur dioxide and water forming acid rain.

User Szymson
by
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