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WorksheetsQuiz on Atoms and Molecules
Total questions: 14
Worksheet time: 7mins
Who first introduced the concept of atoms?
Lavoisier
John Dalton
Democritus
Maharishi Kanad
What does Dalton's Atomic Theory state about atoms of different elements?
They are indivisible.
They can be created or destroyed.
They have different masses and properties.
They are identical in mass.
What is the Law of Conservation of Mass?
Mass can be destroyed in a reaction.
Mass is always constant.
Mass can be created in a reaction.
Mass can neither be created nor destroyed.
What is the smallest particle of an element called?
Molecule
Atom
Compound
Ion
What is the relative atomic mass of Oxygen?
16 u
1 u
23 u
12 u
What is a molecule?
A single atom
A compound
Two or more atoms chemically bonded
An element
What is the atomicity of O₃?
3
4
2
1
What does a chemical formula represent?
The physical state of a substance
The color of a substance
The temperature of a reaction
The symbolic representation of a compound
What is the molecular mass of H₂O?
22 u
20 u
18 u
16 u
What is Avogadro's number?
6.022 × 10²²
6.022 × 10²³
6.022 × 10²⁴
6.022 × 10²⁵
How many moles are in 9 g of water?
0.5 mol
2 mol
1.5 mol
1 mol
What is the mass of 1 mole of O₂?
32 g
36 g
18 g
16 g
What is the atomicity of a monoatomic element?
4
3
2
1
Which of the following is a diatomic molecule?
S₈
P₄
H₂
O₃
