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Questions and Answers
What is the formula for sodium sulphate?
What is the formula for sodium sulphate?
Two sodium ions can be combined with one sulphate ion to form the formula Na2SO4.
Two sodium ions can be combined with one sulphate ion to form the formula Na2SO4.
True
What is the valency of the sulphate ion?
What is the valency of the sulphate ion?
2-
The formula for sodium phosphate is __________.
The formula for sodium phosphate is __________.
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Match each ion with its corresponding valency:
Match each ion with its corresponding valency:
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What is the symbol for the ammonium ion?
What is the symbol for the ammonium ion?
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All metallic ions have a positive charge.
All metallic ions have a positive charge.
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What is the charge of a calcium ion?
What is the charge of a calcium ion?
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What is the valency of an atom?
What is the valency of an atom?
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The symbol for sodium ion is ______.
The symbol for sodium ion is ______.
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Match the following ions with their respective charges:
Match the following ions with their respective charges:
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The chemical formula represents the valency of the elements in a compound.
The chemical formula represents the valency of the elements in a compound.
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What is the role of valency in chemical reactions?
What is the role of valency in chemical reactions?
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Which of the following elements can form an ion with a charge of 3+?
Which of the following elements can form an ion with a charge of 3+?
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Hydride is a polyatomic ion.
Hydride is a polyatomic ion.
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An ion carrying a charge is known as a __________.
An ion carrying a charge is known as a __________.
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What compound is formed from magnesium and chloride ions?
What compound is formed from magnesium and chloride ions?
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Match the following ions with their valencies:
Match the following ions with their valencies:
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Which of the following correctly describes the concept of valency?
Which of the following correctly describes the concept of valency?
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The charge on the nitrate ion is ______.
The charge on the nitrate ion is ______.
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The ratio of sodium to chlorine in sodium chloride is __________.
The ratio of sodium to chlorine in sodium chloride is __________.
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The term 'valency' can be thought of as the 'number of arms' an atom has.
The term 'valency' can be thought of as the 'number of arms' an atom has.
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Study Notes
Ancient Indian and Greek Philosophers
- Ancient Indian and Greek philosophers pondered the unseen form of matter and its divisibility
- Indian philosopher, Maharishi Kanad, proposed that matter could be divided into smaller and smaller particles (Parmanu), eventually reaching indivisible particles
- Greek philosophers Democritus and Leucippus suggested that matter could be divided into indivisible particles called atoms
Law of Conservation of Mass
- Lavoisier and Proust demonstrated that mass does not change during a chemical reaction
- Mass is neither created nor destroyed in a chemical reaction
Law of Constant Proportions
- Compounds always contain the same elements in the same proportions by mass, regardless of the source or method of preparation
Dalton's Atomic Theory
- Dalton proposed that all matter is made of atoms
- Atoms are indivisible particles that cannot be created or destroyed in a chemical reaction
- Atoms of the same element are identical in mass and chemical properties
- Atoms of different elements have different masses and chemical properties
- Atoms combine in simple whole number ratios to form compounds
Atoms and Molecules
- Atoms are the fundamental building blocks of matter
- Atoms cannot exist independently and are joined together to form molecules or ions
- Molecules are groups of bonded atoms that can exist independently
- Elements combine to form compounds
- The smallest unit of an element that can exist independently is an atom
- Compounds are materials made of more than one element that are bonded together
Atomic Mass
- John Dalton introduced the concept of atomic mass
- A relative scale for comparing masses of all atoms with an atomic mass unit (amu or u) was created, which relates elements to the atomic mass of carbon-12 isotope
- The molecular mass of a compound is the sum of the atomic masses of all atoms in a molecule
Chemical Formulas
- Chemical formulae represent the composition of compounds using symbols and subscripts
- Symbols represent elements and subscripts represent the number of atoms of each element in a molecule or formula unit
- Valency or charge is used in writing formulas
- When a compound consists of a metal and a nonmetal, the metal's symbol is written first.
- In compounds with polyatomic ions, the formula of the ion is enclosed in parentheses, and the number of those ions is written outside the parentheses
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Description
Explore the foundational concepts of atomic theory and the contributions of ancient Indian and Greek philosophers. This quiz covers key ideas such as the law of conservation of mass, the law of constant proportions, and Dalton's atomic theory. Test your knowledge on how matter is viewed through the lens of these historical thinkers.
