A water molecule consists of two hydrogen atoms bonded to an oxygen atom. Which type of substance is water?

Rationale

Water is a compound formed by the chemical bonding of hydrogen and oxygen atoms.

A compound is defined as a substance formed when two or more elements are chemically bonded together in a fixed ratio. In the case of water, it consists of two hydrogen atoms covalently bonded to one oxygen atom, making it a prime example of a compound.

A (Element) YOUR ANSWER

An element is a pure substance that cannot be broken down into simpler substances by chemical means. Elements consist of only one type of atom, while water is made up of two different types of atoms—hydrogen and oxygen. Therefore, water cannot be classified as an element.

B (Compound) CORRECT

Water is indeed a compound, as it is formed by the chemical combination of hydrogen and oxygen in a specific ratio (2:1). This fixed composition and the resultant chemical properties distinguish it from simpler substances, confirming its classification as a compound.

C (Isotope) YOUR ANSWER

Isotopes are variants of a particular chemical element that have the same number of protons but different numbers of neutrons. Water does not fit this definition because it is not an atom or element itself; rather, it is a molecule consisting of atoms of different elements. Thus, water cannot be classified as an isotope.

D (Mixture) YOUR ANSWER

A mixture is a combination of two or more substances that are not chemically bonded together, meaning they retain their individual properties. Water, however, is a chemically bonded substance with a consistent composition, which disqualifies it from being a mixture.

Conclusion

Water exemplifies a compound through its formation from two different elements, hydrogen and oxygen, bonded in a specific ratio. This chemical bonding results in unique properties distinct from those of the individual elements. Understanding this classification highlights the fundamental differences between elements, compounds, isotopes, and mixtures, which are essential concepts in chemistry.

A water molecule consists of two hydrogen atoms bonded to an oxygen atom. Which type of substance is water?

Water is a compound formed by the chemical bonding of hydrogen and oxygen atoms.

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