Atoms and Molecules — Practice Quiz
Gujarat Board · Class 9 · Science
Try a 4-question quiz on Atoms and Molecules for Gujarat Board Class 9 Science: tap an answer to check it and see why.
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Quick Quiz: Atoms and Molecules
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What is the smallest particle of matter that cannot be divided further by chemical means?
According to the law of conservation of mass, what happens to mass during a chemical reaction?
What is the atomicity of oxygen gas (O₂)?
What is the chemical symbol for sodium?
Sample Questions
Which of the following are examples of diatomic molecules?
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H₂, O₂, N₂, Cl₂
Diatomic molecules contain exactly two atoms. H₂, O₂, N₂, and Cl₂ are all diatomic molecules. Helium (He) is monoatomic, existing as single atoms.
In water (H₂O), what is the ratio of hydrogen to oxygen by mass?
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1:8
In water, the mass ratio of hydrogen to oxygen is always 1:8. This means for every 1 gram of hydrogen, there are 8 grams of oxygen, regardless of the source of water.
Which of the following statements about Dalton's atomic theory are correct?
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All matter is made of atoms, Atoms are indivisible, Atoms of the same element are identical, Atoms combine in simple whole number ratios
Dalton's atomic theory states that all matter is made of indivisible atoms, atoms of the same element are identical, and they combine in simple ratios. Atoms cannot be created or destroyed in chemical reactions.
What is the formula for calcium oxide?
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CaO
Calcium oxide has the formula CaO. Calcium has a valency of +2 and oxygen has a valency of -2, so they combine in a 1:1 ratio to form CaO.
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