Unit 3 Review: Question Preview (ID: 14084)


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What is the primary difference between an element and a compound?
a) An element is made up of different kinds of atoms while a compound is made up of the same kinds o b) A compound is made up of different kinds of atoms while an element is made up of the same kinds o c) An element is made up of different kinds of compounds. d) None of the above
What forms when carbon (C) and oxygen (O) chemically combine?
a) an atom b) a compound c) an element d) a molecule
Which of the following is an example of an element?
a) Helium (He) b) Iron (Fe) c) Lead (Pb) d) all of the above
Why is carbon dioxide (CO2) classified as a compound?
a) It is not a compound b) the elements are chemically bonded c) the substances have mixed together d) because it contains carbon
How many different elements are in the chemical formula in CH4?
a) 4 b) 2 c) 6 d) 0
Which of the following chemical symbols best represents an element?
a) Fe b) HCl c) NaCl d) CO2
Which of the following is a chemical formula?
a) Pb b) Si c) NaCl d) Li
Which of the following is most abundant in the Earth’s crust?
a) aluminum b) iron c) oxygen d) silicon
When writing a symbol for an element, which rule is important to remember?
a) There are always 2 letters b) The first letter is always capitalized c) All letters are always capitalized d) there is always a period
How many different elements are involved in the chemical equation - C2H5OH + O --> 2 CO+H2O
a) 3 b) 4 c) 21 d) 11
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