1 / 16

Atomic Theory

Atomic Theory. History of Atom. Early Greeks believed that matter consisted of tiny particles – they called the “atoms”. John Dalton. English school teacher in 1800’s Proposed atomic theory. Dalton’s Atomic Theory. All matter is composed of tiny particles called atoms

kreeli
Télécharger la présentation

Atomic Theory

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Atomic Theory

  2. History of Atom • Early Greeks believed that matter consisted of tiny particles – they called the “atoms”

  3. John Dalton • English school teacher in 1800’s • Proposed atomic theory

  4. Dalton’s Atomic Theory • All matter is composed of tiny particles called atoms • Atoms of a given element have the same size, mass, and physical properties • Atoms cannot be subdivided, created, or destroyed

  5. Atoms can combine in simple, whole-number ratios to form compounds • In chemical reactions, atoms can combine, separate, or rearrange

  6. Dalton’s Theory Today • Dalton’s theory still holds true today with a few exceptions • Atoms can be subdivided in nuclear reactions • Atoms of he same element can have different masses – they are called Isotopes

  7. Law of Conservation of Mass • Matter and its mass cannot be created or destroyed

  8. Law of Definite Composition • In a compound, the ratio of atoms is always the same • For example: water (H2O) always has a mass ratio of 1:8 • In water there is always 1 gram of water for 8 grams of oxygen

  9. Law of Multiple Proportions • Two or more different compounds are composed of the same 2 elements, they are whole number ratios of each other

  10. Which of the following is not part of Dalton’s Atomic Theory • Matter is made of atoms • Atoms can be subdivided • Atoms combine or separate in chemical reactions • Atoms cannot be created or destroyed

  11. In water, the mass ratio of hydrogen to oxygen is 1:8. If you have 10 grams of hydrogen in a sample of water, how many grams of oxygen is there • 16 • 32 • 80 • 800

  12. In a chemical reaction 15 g of A combine with 30 g of B to form compound AB. What is the mass of AB?

  13. If the mass ratio is 3:2 in compound AB, what is the ratio is compound AB2? 3:___

More Related