Unit 2: Elements And Compounds (Chemistry I) Question Preview (ID: 40263)


Elements Vs. Compounds, Common Elements, And Evidences Of A Chemical Change. TEACHERS: click here for quick copy question ID numbers.

Which substance is an element?
a) NaCl
b) H2O
c) O2
d) NH4

Na is considered
a) Mixture
b) Solution
c) an element
d) A compound

CO2 is considered a ...
a) Mixture
b) Solution
c) an element
d) a compound

Which of the following is evidence of a chemical change?
a) one liquid disappears into another
b) when two substances mix together
c) when bubbles are produced
d) when a substance melts

What happens during a chemical change?
a) Two or more chemicals react together
b) a new substance is made
c) It can not be easily changed back
d) all of the above

What are the most common elements found in living organisms?
a) Nitrogen and Oxygen
b) Nitrogen and Carbon
c) Oxygen and Carbon
d) Carbon and Hydrogen

What are the most common elements found in Earth's Atmosphere?
a) Nitrogen and Oxygen
b) Nitrogen and Carbon
c) Oxygen and Carbon
d) Carbon and Hydrogen

What are the most common elements found in Earth's Crust?
a) Hydrogen and Nitrogen
b) Hydrogen and Silicon
c) Oxygen and Hydrogen
d) Oxygen and Silicon

What are the common elements found in Earth's oceans?
a) Hydrogen and Nitrogen
b) Hydrogen and Silicon
c) Oxygen and Hydrogen
d) Oxygen and Silicon

How can you tell if a substance is a compound?
a) There are 2 different capital letters
b) There is only once capital letter
c) There is only one color
d) There is only one size molecule

How can you tell if the object is an element?
a) There are 2 different colors
b) There are 2 different capital letters
c) There are 2 substances bonded together
d) There is only one size molecule

Which substance is a compound
a) CaCO3
b) C4
c) Na
d) O2

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