History of the atom Flashcards
mendeleez, dalton ect (33 cards)
Who was John Dalton?
A British chemist and physicist
John Dalton lived from 1766 to 1844.
What model did John Dalton develop?
The Dalton Model of the Atom
This model is foundational for modern atomic theory.
What significant contribution did Dalton make to science?
He laid the groundwork for modern atomic theory
Dalton’s work was crucial in understanding the atomic structure of matter.
What did Dalton propose about matter?
All matter is made of tiny particles called atoms
This idea is a fundamental principle of atomic theory.
What prompted Dalton’s interest in the atomic nature of matter?
His studies of gases and their behavior
Dalton observed how different gases interact.
What observation did Dalton make regarding gases?
Different gases combine in specific ratios
This observation helped him formulate his atomic theory.
Dalton lived from 1766 to 1844.
What model did John Dalton develop?
The Dalton Model of the Atom
This model laid the groundwork for modern atomic theory.
What did Dalton propose about matter?
All matter is made of tiny particles called atoms
This was a key concept in his atomic theory.
What sparked Dalton’s interest in atomic theory?
His studies of gases and their behavior
He observed that different gases combine in specific ratios.
Fill in the blank: John Dalton’s atomic theory states that all matter is made of tiny particles called _______.
atoms
What observation did Dalton make about gases?
Different gases combine in specific ratios
This observation helped him formulate his atomic theory.
What are the tiny, indivisible particles that make up all matter called?
Atoms
Atoms are the smallest units of an element that can participate in a chemical reaction.
What is true about atoms of the same element?
They are identical in mass and properties
For example, all hydrogen atoms have the same mass and chemical properties.
How do atoms of different elements differ?
They have different masses and properties
Each element is unique due to the unique properties of its atoms.
How are chemical compounds formed?
By the combination of atoms of different elements in simple whole number ratios
For instance, one atom of oxygen and two atoms of hydrogen combine to form a molecule of water (H2O).
What happens during a chemical reaction?
Atoms are rearranged
During a chemical reaction, atoms are neither created nor destroyed but simply rearranged to form new substances.
Fill in the blank: All matter is made of tiny, _______ particles called atoms.
indivisible
Atoms are the smallest units of an element that can participate in a chemical reaction.
Fill in the blank: Atoms of the same element have the _______ mass and properties.
same
For example, all hydrogen atoms have the same mass and chemical properties.
Fill in the blank: Chemical compounds are formed by combining atoms in _______ whole number ratios.
fixed
For instance, one atom of oxygen and two atoms of hydrogen combine to form a molecule of water (H2O).
True or False: Atoms of different elements have the same properties.
False
Each element is unique due to the unique properties of its atoms.
List the key postulates of Dalton’s Atomic Model.
- All matter is made of atoms
- Atoms of the same element are identical
- Atoms of different elements differ
- Compounds are formed by combining atoms
- Reactions rearrange atoms
Each postulate outlines fundamental concepts of atomic theory.
Who is known for the first modern atomic theory?
John Dalton
