Which element is named after the creator of the periodic table?
Mendelevium
Curium
Fermium
Einsteinium
What is the most abundant element in the Earth's crust?
Iron
Oxygen
Silicon
Aluminum
What is the chemical formula for table salt?
KCl
NaCl
NaHCO₃
CaCO₃
Which gas is known as “laughing gas”?
Nitrous oxide
Carbon dioxide
Methane
Oxygen
Which element is a noble gas?
Nitrogen
Helium
Chlorine
Oxygen
What color does copper turn when it oxidizes?
Green
Blue
Red
Black
Which acid is found in the stomach?
Sulfuric acid
Hydrochloric acid
Nitric acid
Acetic acid
Which element is essential for thyroid function?
Iron
Iodine
Zinc
Fluorine
What is the most reactive metal?
Sodium
Potassium
Lithium
Cesium
Which compound causes the blue color in fireworks?
Copper chloride
Strontium nitrate
Sodium nitrate
Barium chloride
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