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TRUE or FALSE: Every sample of a pure substance has exactly the same composition and the same properties.
TRUE
What are two categories of pure substances?
elements and compounds
A ________________ is a substance that cannot be broken down into simpler substances. .
element
TRUE or FALSE: The smallest particle of an element is an atom.
TRUE
An element has a __________ composition because it contains only one type of atom.
fixed or set
Which of the following is a gas at room temperature: carbon, oxygen, mercury or nitrogen?
oxygen and nitrogen
What is the chemical symbol for aluminum?
Al
What is the chemical symbol for gold?
Au
What is the chemical symbol for carbon?
C
A compound is a pure substance that is made from _____________ and can be broken down into those simple substances.
two or more simpler substances
TRUE or FALSE: A compound always contains at least two elements.
TRUE
TRUE or FALSE: The substances that make up a compound are always joined in a fixed proportion.
TRUE
TRUE or FALSE: A compound can be broken down into simpler substances.
TRUE
TRUE or FALSE: A compound has the same properties as the elements from which it is formed.
FALSE
The properties of a mixture can vary because the composition of a mixture is not ________.
fixed
A __________ mixture is a mixture whose parts are noticeably different from one another.
heterogeneous
