Unit 3 Review Question Preview (ID: 14084)


This Test Reviews Elements And Compounds For Our End Of Course Exam. TEACHERS: click here for quick copy question ID numbers.

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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