The Precise Weight of a Mole of Some Pure Elements

question 45

Multiple Choice

The precise weight of a mole of some pure elements like silicon (Si) can vary slightly from the standard atomic mass, or even from sample to sample. Why?

• A) The element may undergo radioactive decay.
• B) The element may react with itself and gain or lose subatomic particles.
• C) The atoms of the element form chemical bonds with each other, and that changes the weight of the element.
• D) The element may have multiple stable isotopes, and the isotopic composition may vary from sample to sample.
• E) The amount of energy absorbed by the element affects the mass of its electrons, and thus the atomic mass can vary slightly.

Understand the implications of movements in real exchange rates and net exports.

Evaluate the effect of government policies on the economy's standard of living.

Analyze the impact of changes in national saving and investment on the supply of loanable funds.

Understand the concept of purchasing power parity and its implications for foreign-currency exchange.

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Definitions:

House of Representatives

One of the two chambers of the United States Congress, responsible for making and passing federal laws, consisting of members elected from each state, with the number of representatives based on the state's population.

Fixed

Set or decided upon definitively and with authority, often referring to predetermined policies or positions.

Bicameral Legislature

A legislative body made up of two chambers or houses, typically a lower house and an upper house, aiming to provide balance and thorough review of legislation.

House District

A defined geographic area represented by a member in the lower chamber of a legislative body, particularly in the context of the U.S. House of Representatives.