which of the following are pure substances?
a. solutions
b. compounds
c. homogeneous mixtures
d. colloids
A?
thank you
and B
the answer was just b but thanks
if a material contains three elects joined in a fixed proportion it is a ( an )
To determine whether a substance is a pure substance, we need to understand its definition. A pure substance is a type of matter that has a fixed composition and distinct properties. It cannot be separated into other substances by physical means.
Now, let's analyze the options given:
a. Solutions: A solution is a homogeneous mixture of two or more substances. It consists of a solute dissolved in a solvent. While solutions can be uniform throughout, they are not considered pure substances because they are mixtures.
b. Compounds: Compounds are pure substances made up of two or more different elements chemically combined in a fixed ratio. The elements in a compound are chemically bonded together, and they cannot be separated by physical means. Thus, compounds are pure substances.
c. Homogeneous Mixtures: Homogeneous mixtures are uniform mixtures of two or more substances. They have the same composition and properties throughout. However, like solutions, homogeneous mixtures are not pure substances because they are combinations of different substances.
d. Colloids: Colloids are mixtures where particles are dispersed throughout a medium. These particles are typically larger than those found in solutions but smaller than those found in suspensions. Colloids, being mixtures, are not considered pure substances.
Based on the explanations above, the only pure substances among the options provided are compounds. Therefore, the correct answer is b. compounds.