What is the writing material in lead pencils?
What is the chemical formula for water?
What chemical element has the same name as Superman's home planet?
Nonstick cooking utensils are coated with ----------.
What is the principal ore of aluminum?
Deuterium oxide is also known as "heavy --------."
Term for the ability of a solid to absorb moisture from the air
Galvanized metal is covered with a layer of --------.
Which of the allotropes of carbon is (a) the hardest (b) the softest?
ANSWERS:
Graphite
H2O
Krypton
Teflon
Bauxite
Water
Deliquescence
Zinc
(a) Diamond (b) graphite
Food on 11/29/2017