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1. An unknown white substance is heated
and produced white smoke and black solid. What do
you think is this substance?
a) a mixture
b. an element
c. a compound d. a diatomic molecule
2. Water is composed of two atoms of
hydrogen and one atom of oxygen. Which of the
following can be the particle model for water?
A
B
D
ovement
hea
d)


Sagot :