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Questions and Answers
According to the law of constant proportions, what is the mass ratio of hydrogen to oxygen in water?
According to the law of constant proportions, what is the mass ratio of hydrogen to oxygen in water?
- 4:9
- 2:5
- 3:7
- 1:8 (correct)
Who stated the law that in a chemical substance, elements are always present in definite proportions by mass?
Who stated the law that in a chemical substance, elements are always present in definite proportions by mass?
- J.J. Thomson
- Antoine Lavoisier
- John Dalton
- Joseph Proust (correct)
Which scientist provided the basic theory about the nature of matter and introduced the concept of atoms?
Which scientist provided the basic theory about the nature of matter and introduced the concept of atoms?
- John Dalton (correct)
- Antoine Lavoisier
- J.J. Thomson
- Joseph Proust
What is another name for the law of constant proportions?
What is another name for the law of constant proportions?
Which concept formed the basis for John Dalton's theory of matter?
Which concept formed the basis for John Dalton's theory of matter?
According to Dalton's atomic theory, which statement is true about atoms?
According to Dalton's atomic theory, which statement is true about atoms?
How did Dalton's atomic theory contribute to the understanding of matter?
How did Dalton's atomic theory contribute to the understanding of matter?
Which law is explained by Dalton's atomic theory?
Which law is explained by Dalton's atomic theory?
What did Dalton propose about the indivisibility of atoms?
What did Dalton propose about the indivisibility of atoms?
According to Dalton's atomic theory, why are atoms of a given element identical?
According to Dalton's atomic theory, why are atoms of a given element identical?
Which of the following is a key concept proposed by Dalton's atomic theory?
Which of the following is a key concept proposed by Dalton's atomic theory?
According to the law of constant proportions, what is true about the composition of a chemical compound?
According to the law of constant proportions, what is true about the composition of a chemical compound?
What is the relationship between the masses of the elements in a chemical compound, as described by the law of definite proportions?
What is the relationship between the masses of the elements in a chemical compound, as described by the law of definite proportions?
In the example of carbon monoxide (CO) given in the text, what is the ratio of the masses of carbon and oxygen in the compound?
In the example of carbon monoxide (CO) given in the text, what is the ratio of the masses of carbon and oxygen in the compound?
What was the key contribution of John Dalton to the understanding of chemical reactions and the composition of matter?
What was the key contribution of John Dalton to the understanding of chemical reactions and the composition of matter?
Who postulated the idea of Parmanu, the smallest particles beyond which further division will not be possible?
Who postulated the idea of Parmanu, the smallest particles beyond which further division will not be possible?
What did Democritus name as indivisible particles?
What did Democritus name as indivisible particles?
Who established two important laws of chemical combination that laid the foundation of chemical sciences?
Who established two important laws of chemical combination that laid the foundation of chemical sciences?
According to ancient Indian philosophers, what was the smallest particle of matter named by Maharishi Kanad?
According to ancient Indian philosophers, what was the smallest particle of matter named by Maharishi Kanad?
Who suggested that a stage will come when particles obtained cannot be divided further?
Who suggested that a stage will come when particles obtained cannot be divided further?
Which statement best represents the law of conservation of mass in the given chemical reaction?
Which statement best represents the law of conservation of mass in the given chemical reaction?
According to Dalton's atomic theory, which postulate explains the law of definite proportions?
According to Dalton's atomic theory, which postulate explains the law of definite proportions?
If 3 g of hydrogen gas reacts completely with oxygen gas to form water, what mass of oxygen gas is required?
If 3 g of hydrogen gas reacts completely with oxygen gas to form water, what mass of oxygen gas is required?
Which postulate of Dalton's atomic theory is a consequence of the law of conservation of mass?
Which postulate of Dalton's atomic theory is a consequence of the law of conservation of mass?
Why is it important to study atoms, despite their extremely small size?
Why is it important to study atoms, despite their extremely small size?
Which concept did Dalton introduce when he used symbols for elements?
Which concept did Dalton introduce when he used symbols for elements?
What did Berzilius suggest about the symbols of elements?
What did Berzilius suggest about the symbols of elements?
How were the names of elements derived in the beginning?
How were the names of elements derived in the beginning?
What does IUPAC approve regarding elements?
What does IUPAC approve regarding elements?
According to Dalton's atomic theory, what do symbols for elements represent?
According to Dalton's atomic theory, what do symbols for elements represent?
If the atomic mass unit is defined as the mass of one carbon atom, what was the initial choice for the unit before transitioning to the carbon-12 isotope in 1961?
If the atomic mass unit is defined as the mass of one carbon atom, what was the initial choice for the unit before transitioning to the carbon-12 isotope in 1961?
Which element was chosen as the standard reference for measuring atomic masses in 1961?
Which element was chosen as the standard reference for measuring atomic masses in 1961?
Why was oxygen initially chosen as the reference point for atomic masses?
Why was oxygen initially chosen as the reference point for atomic masses?
Which concept led to the choice of 1/16th of an oxygen atom's mass as the initial atomic mass unit?
Which concept led to the choice of 1/16th of an oxygen atom's mass as the initial atomic mass unit?
How did scientists initially determine the value of the atomic mass unit based on naturally occurring oxygen?
How did scientists initially determine the value of the atomic mass unit based on naturally occurring oxygen?
Which scientist laid the foundation for using atomic masses to understand chemical reactions?
Which scientist laid the foundation for using atomic masses to understand chemical reactions?
What was the key reason for choosing carbon-12 as the standard reference for atomic masses in 1961?
What was the key reason for choosing carbon-12 as the standard reference for atomic masses in 1961?
'Unified mass' or 'u' is the modern abbreviation for which previously used term?
'Unified mass' or 'u' is the modern abbreviation for which previously used term?
Explain how the given chemical reaction involving sodium acetate, carbon dioxide, and water is in agreement with the law of conservation of mass.
Explain how the given chemical reaction involving sodium acetate, carbon dioxide, and water is in agreement with the law of conservation of mass.
In what ratio, by mass, do hydrogen and oxygen combine to form water?
In what ratio, by mass, do hydrogen and oxygen combine to form water?
Which postulate of Dalton’s atomic theory is a result of the law of conservation of mass?
Which postulate of Dalton’s atomic theory is a result of the law of conservation of mass?
Which postulate of Dalton’s atomic theory can explain the law of definite proportions?
Which postulate of Dalton’s atomic theory can explain the law of definite proportions?
How does the text emphasize the significance of atoms despite their small size?
How does the text emphasize the significance of atoms despite their small size?
What is the significance of the symbols of some elements being derived from the first letter of the name and a letter appearing later in the name?
What is the significance of the symbols of some elements being derived from the first letter of the name and a letter appearing later in the name?
How did Dalton's atomic theory contribute to the understanding of the law of constant proportions?
How did Dalton's atomic theory contribute to the understanding of the law of constant proportions?
Why were relative atomic masses used instead of determining the mass of individual atoms directly?
Why were relative atomic masses used instead of determining the mass of individual atoms directly?
What is the rationale behind using symbols from Latin, German, or Greek names for some elements?
What is the rationale behind using symbols from Latin, German, or Greek names for some elements?
How did Dalton's atomic theory address the concept of identical atoms of a given element?
How did Dalton's atomic theory address the concept of identical atoms of a given element?
Who postulated the idea of Parmanu, the smallest particles beyond which further division will not be possible?
Who postulated the idea of Parmanu, the smallest particles beyond which further division will not be possible?
What was the name given by Democritus to the indivisible particles he proposed?
What was the name given by Democritus to the indivisible particles he proposed?
Who laid the foundation of chemical sciences by establishing two important laws of chemical combination?
Who laid the foundation of chemical sciences by establishing two important laws of chemical combination?
What concept formed the basis for John Dalton's theory of matter?
What concept formed the basis for John Dalton's theory of matter?
What did Berzelius suggest about the symbols of elements?
What did Berzelius suggest about the symbols of elements?
What were the key postulates of John Dalton's atomic theory?
What were the key postulates of John Dalton's atomic theory?
How did John Dalton contribute to the development of the periodic table?
How did John Dalton contribute to the development of the periodic table?
Explain the significance of the law of constant proportions in Dalton's atomic theory.
Explain the significance of the law of constant proportions in Dalton's atomic theory.
What was the rationale behind Dalton's choice of using symbols for elements?
What was the rationale behind Dalton's choice of using symbols for elements?
How did Dalton's atomic theory impact the understanding of chemical reactions and matter composition?
How did Dalton's atomic theory impact the understanding of chemical reactions and matter composition?
Explain the significance of the law of constant proportions in understanding chemical compounds.
Explain the significance of the law of constant proportions in understanding chemical compounds.
How did John Dalton contribute to the development of atomic theory?
How did John Dalton contribute to the development of atomic theory?
What concept did John Dalton introduce in his atomic theory that revolutionized the understanding of matter?
What concept did John Dalton introduce in his atomic theory that revolutionized the understanding of matter?
Explain the importance of chemical symbols in Dalton's atomic theory.
Explain the importance of chemical symbols in Dalton's atomic theory.
How did the concept of atoms help explain the law of conservation of mass?
How did the concept of atoms help explain the law of conservation of mass?
Define the term 'atomic mass unit' (amu) and explain its significance in measuring atomic masses.
Define the term 'atomic mass unit' (amu) and explain its significance in measuring atomic masses.
How did the concept of 'molecules' challenge the idea of atoms existing independently?
How did the concept of 'molecules' challenge the idea of atoms existing independently?
Explain the significance of John Dalton's atomic theory in shaping our understanding of matter.
Explain the significance of John Dalton's atomic theory in shaping our understanding of matter.
How did the choice of oxygen as a reference point impact the determination of atomic masses of elements?
How did the choice of oxygen as a reference point impact the determination of atomic masses of elements?
Discuss the relationship between atomic mass and the law of definite proportions proposed by Dalton.
Discuss the relationship between atomic mass and the law of definite proportions proposed by Dalton.
What was the significance of IUPAC in relation to elements?
What was the significance of IUPAC in relation to elements?
Why did John Dalton suggest that symbols of elements be made from one or two letters of the name of the element?
Why did John Dalton suggest that symbols of elements be made from one or two letters of the name of the element?
How did Berzilius recommend the symbols of elements to be written?
How did Berzilius recommend the symbols of elements to be written?
Why was the first letter of a symbol always written as a capital letter according to the conventions?
Why was the first letter of a symbol always written as a capital letter according to the conventions?
What was the historical basis for the names of elements initially?
What was the historical basis for the names of elements initially?
What is the modern abbreviation for the term 'atomic mass unit'?
What is the modern abbreviation for the term 'atomic mass unit'?
How were the symbols for some elements proposed by Dalton as shown in Fig. 3.3?
How were the symbols for some elements proposed by Dalton as shown in Fig. 3.3?
Explain the significance of Dalton's suggestion that symbols represent a definite quantity of the element.
Explain the significance of Dalton's suggestion that symbols represent a definite quantity of the element.
What was the primary role of Dalton's symbols for elements?
What was the primary role of Dalton's symbols for elements?
What role did Dalton play in the development of symbols for elements?
What role did Dalton play in the development of symbols for elements?
