Dalton's Atomic Theory

What are the Dalton's Atomic Theory?

• Elements are composed of extremely small particles called atoms.

• A chemical reaction involves only the separation, combination, or rearrangement  of atoms; it does not result in the creation or destruction of atoms.

• Compounds are composed of atoms of more than one element. For any given

  compound, the atoms present are always in the same ratio.

• All atoms of a given element are identical, having the same size, mass, and chemical

  properties. The atoms of one element are the same from the atoms of all other elements.

• All atoms of a given element are identical, having the same size, mass, and chemical

  properties. The atoms of one element are different from the atoms of all other elements.

Tags

NGSS.HS-PS1-7

He formulated a precise  definition of the indivisible building  blocks of matter that we call atoms.

• Isaac Newton

• John Dalton

• Matthias Schleiden

• Aristotle

Tags

NGSS.HS-PS1-7

A compound is always composed of the same elements in the same proportion by mass.

• TRUE

• FALSE

Tags

NGSS.MS-PS1-5

What scientist first developed 4 rules for atomic theory, and helped kick start modern chemistry?

• J.J. Thomson

• Ernest Rutherford

• John Dalton

• Democritus

Tags

NGSS.HS-PS1-7

What was Dalon's atomic theory about ?

• Matter is made tiny particles called atoms.

• Atoms combine in whole numbers.

• Atoms of an element are identical in mass and properties.

• Different elements have different properties.

• They are divisible into protons. It contains electronic shells.

Tags

NGSS.HS-PS1-7

During the __________ scientists began to develop a theory as to how atoms work.

• 1600s

• 1700s

• 1800s

• 1900s

Who developed the atomic theory? (a)  

• Dalton

• Thomson

• Chadwick

• Rutherford

It states that Whenever the same two elements form more than one compound, the different masses of one element that combine with the same mass of the other element are in the ratio of small whole numbers.

• Law of Multiple Proportion

• Law of Definite Proportion

• Law of Conservation of Mass

According to Dalton, can atoms be created or destroyed in a chemical reaction?

• Atoms can be created in a chemical reaction.

• Atoms can be destroyed in a chemical reaction.

• No, atoms cannot be created or destroyed in a chemical reaction.

• Atoms can change into different elements during a reaction.

Tags

NGSS.HS-PS1-7

What is the first postulate of Dalton's atomic theory?

• Atoms can be created and destroyed.

• All matter is made of indivisible atoms.

• All matter is composed of molecules.

• All atoms of an element are identical in mass.