Chemistry & Elements

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Date:

Instructions: Discover the building blocks of matter with this chemistry challenge

1.
What is the most abundant element in the universe?
A
Helium
B
Carbon
C
Oxygen
D
Hydrogen
2.
Which element's chemical symbol is 'Fe'?
A
Iron
B
Fermium
C
Francium
D
Fluorine
3.
What is the only metal that is liquid at standard room temperature?
A
Cesium
B
Bromine
C
Mercury
D
Gallium
4.
Which gas makes up about 21% of Earth's atmosphere?
A
Oxygen
B
Carbon dioxide
C
Argon
D
Nitrogen
5.
What type of chemical bond involves the sharing of electron pairs between atoms?
A
Covalent bond
B
Hydrogen bond
C
Ionic bond
D
Metallic bond
6.
What is the pH of pure water at room temperature?
A
7
B
6
C
8
D
5
7.
Which scientist created the first widely recognized periodic table of elements?
A
John Dalton
B
Robert Boyle
C
Antoine Lavoisier
D
Dmitri Mendeleev
8.
What are the noble gases known for?
A
Being radioactive
B
Being highly reactive
C
Being chemically inert
D
Being extremely rare
9.
What element is essential for all organic chemistry and life as we know it?
A
Phosphorus
B
Carbon
C
Nitrogen
D
Silicon
10.
Which acid is commonly found in car batteries?
A
Nitric acid
B
Hydrochloric acid
C
Phosphoric acid
D
Sulfuric acid
11.
What is the chemical formula for table salt?
A
CaCl2
B
KCl
C
NaCl
D
NaOH
12.
Which element, atomic number 79, has been prized by civilizations for thousands of years?
A
Gold
B
Copper
C
Platinum
D
Silver
13.
What process converts a solid directly into a gas without passing through the liquid phase?
A
Deposition
B
Condensation
C
Evaporation
D
Sublimation
14.
Which element is used in most semiconductor chips and computer processors?
A
Gallium
B
Germanium
C
Silicon
D
Carbon
15.
What does the atomic number of an element represent?
A
Number of protons
B
Number of neutrons
C
Total mass of the atom
D
Number of electrons in the outer shell

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