select the correct answer. which statement best describes how a compound is different from an element? a. a…
select the correct answer. which statement best describes how a compound is different from an element? a. a compound contains two or more elements in a fixed proportion. b. a compound has a greater mass and volume than an element. c. a compound has a definite shape, but an element does not. d. a compound is a heterogeneous mixture, but an element is a homogeneous mixture. e. a compound is one of several parts of an element.
Answer
Answer:
A. A compound contains two or more elements in a fixed proportion.
Explanation:
Step1: Recall definitions
Elements are pure substances made of only one - type of atom. Compounds are substances made of two or more different elements chemically combined in a fixed ratio.
Step2: Analyze option A
This option correctly states the key characteristic of a compound. For example, water ($H_2O$) has two hydrogen atoms and one oxygen atom in a fixed 2:1 ratio.
Step3: Analyze option B
Mass and volume are not the defining characteristics to distinguish compounds from elements. They depend on the amount of the substance present.
Step4: Analyze option C
Both elements and compounds can exist in different physical states (solid, liquid, gas) and may or may not have a definite shape depending on the state.
Step5: Analyze option D
Compounds are pure substances, not heterogeneous mixtures. Elements are also pure substances, not homogeneous mixtures.
Step6: Analyze option E
A compound is not a part of an element. Compounds are formed by the combination of different elements.