Scelta multipla
Which of the following is the major impurity added to silicon to create n-type semiconductors?
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2. Atoms & Elements
The Atom
Scelta multipla
Which term describes a chemical substance that cannot be broken down into simpler substances by chemical means?
A
Compound
B
Element
C
Molecule
D
Mixture
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Understand the definitions of the terms given: an element, a compound, a molecule, and a mixture.
Recall that an element is a pure chemical substance consisting of only one type of atom and cannot be broken down into simpler substances by chemical means.
Recognize that a compound is a substance formed when two or more elements chemically combine and can be broken down into those elements.
Know that a molecule is the smallest unit of a compound or element that retains its chemical properties, but it may still be broken down if it is a compound.
Identify that a mixture is a physical combination of two or more substances that can be separated by physical means and is not a pure chemical substance.
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