Elements And Compounds: Question Preview (ID: 21788)

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Which of the following is an element?
a) Water
b) Air
c) Salt
d) Iron

Which of the following is correct?
a) Zn is a compound.
b) NaCl is an element.
c) S is a compound.
d) OH is a compound.

Which statement best summarizes the difference between an element and a compound?
a) An element is a pure substance, and a compound is a combination of elements.
b) An element is two or more compounds, and a compound is two or more elements.
c) An element is a mixture, and a compound is a pure substance.
d) An element is two or more pure substances chemically combined, and a compound is a pure substance.

Which element is abundant in the Earth's crust?
a) Aluminum
b) Iron
c) Caron
d) Silicon

Which elements are abundant in the Earth's oceans?
a) Silicon and hydrogen
b) Hydrogen and oxygen
c) Iron and nickel
d) Carbon and oxygen

Which of the following elements are living things made of?
a) Carbon, nickel, iron
b) Carbon, hydrogen, oxygen
c) Silicon, carbon, oxygen, nitrogen
d) Carbon, hydrogen, nitrogen, oxygen

NaCl is:
a) water.
b) salt.
c) carbon dioxide.
d) glucose.

How many elements are in the chemical formula for glucose, C6H12O6?
a) 1
b) 10
c) 24
d) 3

The formula for sand is:
a) H2O
b) NaHCO3
c) SiO2
d) CO2

All elements are naturally occurring.
a) True
b) False

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