ueu

35問 • 1年前

問題一覧

- can be observed or measured without changing the identity of the substance. - e.g. color, hardness, melting point, boiling point

Physical properties

- Fixed composition (e.g. 100% ethanol) - Cannot be separated into simpler substances by physical methods

Pure Substance

- one or more substances are used up - one or more new substances are formed, - energy is absorbed or released - IRREVERSIBLE - e.g. burning of paper, cooking an egg, souring of milk

Chemical Change

- the smallest unit that retains the properties of an element.

atom

gold

Behavior of matter

physical chem

cobalt

Elements of a chemical compound are held together by_____

electrical forces

Experiment - Most convincing evidence of electrons - Plum pudding model- Most convincing evidence of electrons - Plum pudding model

cathode ray tube experiment

fluorine

Found Electrons" → Electric ions with year

george stoney 1891

Found Relationship between the amount of electricity used in electrolysis and the amount of chemical reaction that occurs (with year)

michael faraday 1832

Found Saturn-like model WITH YEAR

hantaro nagaoka 1903

Found Solid Sphere (Billiard Ball) Model - Atom as solid sphere but NOT indivisible (with year)

john dalton 1807

Found The Discovery of Protons • Canal Rays Experiment (With year)

eugen goldstein 1886

Hydrocarbons and its derivatives

Organic Chemistry

Inorganic compounds, metals, minerals

Inorganic Chem

manganese

nitrogen

Processes in living organisms

biochemistry

Represents the composition of the nucleus

nuclide symbol

Sb (stibium)

antimony

Who The Wave Nature of Electron • _________ - proposed the idea of wave-like nature of electrons • Electrons can be treated as waves more effectively than as small compact particles traveling in circular or elliptical orbits.

louis de brogli

Theory All matter is composed of atoms and these cannot be made or destroyed.

dalton’s theory

Uncuttable

atomos

Who Cathode-Ray Tube Experiment WITH YEAR

joseph john thomson 1897

Who Oil-drop Experiment WITH YEAR

robert millikan 1909

Who described the electron of a hydrogen atom as revolving around its nucleus in one of a discrete set of circular orbits. • ____ Planetary Model - Each orbit thus corresponds to a definite energy level for the electron. - When an electron is excited from a lower energy level to a higher one, it absorbs a definite (quantized) amount of energy. - Electrons occupy only certain energy levels in atoms.

niels bohr

Who said Matter is made up of four elements

aristotle and others

Who said the Elements of a chemical compound are held together by Electrical forces (wih year)

humphry davy 1800s

Who studied X-rays given off by various elements. - "The number of PROTONS in the nucleus of an atom determines its identity; this number is known as the ATOMIC NUMBER of that element. WITH YEAR

HGH moseley 1913

_____ as solid indivisible sphere

atom

amount of space

volume

exhibited by matter as it undergoes changes in composition. - e.g. hydrogen has the potential to ignite and explode given the right conditions - e.g. iron reacts with oxygen gas to form rust

Chemical Properties

found The Scattering Experiment WITH YEAR

ernest rutherford 1910

philo

ユーザ名非公開 · 100問 · 2年前

philo