John Dalton Poster

JOHN DALTON:

The father of the ATOMIC THEORY

Kyla encalada & vanessa chen

Why is he considered the father of atomic theory?

In 1804, John Dalton hypothesized that all atoms of a specific element are equal in both mass and size. Dalton speculated that elements were composed of smaller atoms; this further led to the Atomic Theory Of Matter.

ATOMIC THEORY

1. Matter is made of very tiny particles called atoms.
2. Atoms are indivisible structures, which can neither be created nor destroyed during a chemical reaction (based on the law of conservation of mass).
3. All atoms of a particular element are similar in all respects, be it their physical or chemical properties.
4. Atoms of different elements show different properties, and they have different masses and different chemical properties.
5. Atoms combine in the ratio of small whole numbers to form stable compounds, which is how they exist in nature.
6. The relative number and the kinds of atoms in a given compound are always in a fixed ratio (based on the law of constant proportions).

3 ATOMIC LAWS

Law of Multiple Proportions

Law of Conservation of Mass

Law of Definite Proportions

When elements form compounds, the proportions of the elements in those compounds can be expressed in small whole number ratios.

Matter cannot be created nor destroyed. When an element or compound undergoes any physical or chemical change, the total mass of products is always equal to the total mass of the reactants.

In a chemical substance, elements are always combined in the same proportions by mass.This applies when elements are reacted together to form the same product. Chemical compounds always have the same mass ratio of elements no matter how it is formed.

Example: Any sample of pure water contains 11.19% hydrogen and 88.81% oxygen by mass. It does not matter where the sample of water came from or how it was prepared. Its composition, like that of every other compound, is fixed.

CO 1:1 CO2 1:2

First Atomic Model Proposed: Billiard Ball Model

Dalton thought that atoms were the smallest particles of matter and visualised them and solid, hard spheres (like billiard balls or pool balls). Dalton added holes to the model atoms so they could be joined together using hooks to model compounds.

JOHN DALTON:

The father of the ATOMIC THEORY

Kyla encalada & vanessa chen

Why is he considered the father of atomic theory?

In 1804, John Dalton hypothesized that all atoms of a specific element are equal in both mass and size. Dalton speculated that elements were composed of smaller atoms; this further led to the Atomic Theory Of Matter.

ATOMIC THEORY

1. Matter is made of very tiny particles called atoms.
2. Atoms are indivisible structures, which can neither be created nor destroyed during a chemical reaction (based on the law of conservation of mass).
3. All atoms of a particular element are similar in all respects, be it their physical or chemical properties.
4. Atoms of different elements show different properties, and they have different masses and different chemical properties.
5. Atoms combine in the ratio of small whole numbers to form stable compounds, which is how they exist in nature.
6. The relative number and the kinds of atoms in a given compound are always in a fixed ratio (based on the law of constant proportions).

3 Atomic Laws