Each of the following statements is true, but Dalton migh...

Each of the following statements is true, but Dalton migh have had trouble explaining some of them with his atomi theory. Give explanations for the following statements. a. The space-filling models for ethyl alcohol and dimethyl ether are shown below. These two compounds have the same composition by mass $(52 \%$ carbon, $13 \%$ hydrogen, and $35 \%$ oxygen), yet the two have different melting points, boiling points, and solubilities in water. b. Burning wood leaves an ash that is only a small fraction of the mass of the original wood. c. Atoms can be broken down into smaller particles. d. One sample of lithium hydride is $87.4 \%$ lithium by mass, while another sample of lithium hydride is $74.9 \%$ lithium by mass. However, the two samples have the same chemical properties.

Each of the following statements is true, but Dalton migh have had trouble explaining some of them with his atomi theory. Give explanations for the following statements.
a. The space-filling models for ethyl alcohol and dimethyl ether are shown below.
These two compounds have the same composition by mass $(52 \%$ carbon, $13 \%$ hydrogen, and $35 \%$ oxygen), yet the two have different melting points, boiling points, and solubilities in water.
b. Burning wood leaves an ash that is only a small fraction of the mass of the original wood.
c. Atoms can be broken down into smaller particles.
d. One sample of lithium hydride is $87.4 \%$ lithium by mass, while another sample of lithium hydride is $74.9 \%$ lithium by mass. However, the two samples have the same chemical properties.

Key Concepts

Atomic Structure and Subatomic Particles

Atoms are not indivisible; they are composed of smaller particles including protons, neutrons, and electrons. This concept, which goes beyond older atomic theories, explains that atoms can be split into these fundamental particles, which is crucial for understanding both chemical reactions and nuclear processes.

Isotopes and Their Chemical Behavior

Isotopes are variants of a chemical element that have the same number of protons but different numbers of neutrons, resulting in different atomic masses. Despite this mass variation, isotopes typically exhibit the same chemical properties because chemical behavior is primarily governed by the electronic structure rather than the nucleus. This explains why substances can have variable mass percentages of an element while retaining similar reactivity and chemical characteristics.

Molecular Isomerism

This concept explains that compounds with the same molecular formula can have different arrangements of atoms, leading to distinct physical properties such as melting point, boiling point, and solubility. Differences in bonding and spatial structure (including shape and connectivity) are key factors, which is why substances with identical elemental composition may behave differently in various conditions.

Chemical Reactions and Mass Changes

During chemical reactions, such as combustion, the composition of the reactants is transformed. Although the law of conservation of mass applies, much of the original mass can be converted into gaseous products that disperse, leaving behind only a small fraction of the original material. This concept is essential in understanding transformation processes and mass distribution after a reaction.

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