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Elements are represented by chemical symbols. How many letters are in the chemical symbols of elements?
true
compound
element
True
silicon and oxygen
sometimes one, sometimes two
element
oxygen and nitrogen
Is NaCl an element or a compound?
true
compound
element
True
silicon and oxygen
sometimes one, sometimes two
element
oxygen and nitrogen
Which two elements primarily make up the Earth's atmosphere?
true
compound
element
True
silicon and oxygen
sometimes one, sometimes two
element
oxygen and nitrogen
The Earth's crust is primarily made up of which two elements?
true
compound
element
True
silicon and oxygen
sometimes one, sometimes two
element
oxygen and nitrogen
What type of substance is Au (gold)
true
compound
element
True
silicon and oxygen
sometimes one, sometimes two
element
oxygen and nitrogen
One difference between elements and compounds is that an element consists of only one type of matter, while a compound consists of two or more types.
true
compound
element
True
silicon and oxygen
sometimes one, sometimes two
element
oxygen and nitrogen
Elements are made up of a uniform composition
true
compound
element
True
silicon and oxygen
sometimes one, sometimes two
element
oxygen and nitrogen
What is a substance that can't be broken down into simpler substances?
true
compound
element
True
silicon and oxygen
sometimes one, sometimes two
element
oxygen and nitrogen
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