Dalton's Atomic Theory and Basic Laws of Matter

What does the 4th Dalton's Theory Stated?

• 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 different from the atoms of all other elements.

• Elements are composed of extremely small particles called atoms

What is the Grams of Lithium in the formula Li₂O with a total mass of 2g? (Note: Li mass= 6.9g; O=16g)

• 1.00 g

• 0.92 g

• 0.93 g

• 1.9 g

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

• Isaac Newton

• John Dalton

• Matthias Schleiden

• Aristotle

His published law was became an extension of the law of definite proportion.

• Isaac Newton

• John Dalton

• Joseph Prost

• Joseph Proust

The Percent by mass of Hydrogen in a 20g sucrose.

• 42%

• 6.5%

• 51.5%

• 40%

A 78.0 g sample of an unknown compound contains 12.4g of hydrogen. What is the percent by mass of hydrogen in the compound?

• 14.9%

• 16%

• 15%

• 15.9%

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

• TRUE

• FALSE

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.

A chemical reaction that involves in an atom results in the creation or destruction of atoms

• TRUE

• FALSE

Decomposition of the compound resulted in 25.0 g of Iron and 10.7 g of Oxygen. What is the ratio of Iron to Oxygen?

• 2

• 2.34

• 1.2

• 2.4