Atoms and Molecules — Important Questions
Gujarat Board · Class 9 · Science
59 important questions from Atoms and Molecules for Gujarat Board Class 9 Science, with answers. Includes multiple choice and multiple correct questions.
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Important Questions from Atoms and Molecules
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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