Flashcards
ATOMIC STRUCTURE AND PERIODIC TABLE
Flashcards do conjunto (27)
- 1COMPOUNDGroup of elements that are chemically bonded together
- 2MIXTURESConsists of two or more elements/compounds that aren't chemically joined
hence their chemical properties haven't changed - 35 METHODS OF SEPERATING SUBSTANCES IN MIXTURES1. Filtration (insoluble solid from liquid)
2.Crystallisation/ Evaporation (soluble solid from liquid)
3. Distillation (liquid from solution)
4.Fractional distillation (different liquids from solution)
5.Chromatography (inks from dye) - 4PLUM PUDDING MODEL-discovery of electrons
-describes atoms as a "pudding" of positive charge which contains electrons spread out inside of it. - 5NUCLEAR MODEL-discovery of nucleus
- + charged alpha particles at a thin sheet of gold.
-expected particles to go right through as thought + was spread through the whole pudding.
- some deflected backwards hence + nucleus where mass is concentrated=rest is mostly space. - 6NIELS BOHR-adapted nuclear model
-suggested that electrons orbit around the nucleus in fixed shells - 7JAMES CHADWICK-showed evidence of the existence of neutrons
- 8EARLY PERIODIC TABLE + PROBLEMS-was arranged depending on the atomic mass of the atoms
problems: incomplete, some elements were placed in inappropiate places as they had different properties to those in that column, knowledge of isotopes. - 9ISOTOPESdifferent form of the same atom with a different atomic mass (different amount of neutrons) but the same atomic number (same amount of protons and electrons)
- 10MANDELEEV- arranged the elements depending on their atomic weight
-if one element had similar properties to those in another group=switch
-left blanks for elements he believed hadn't been discovered= help to discover them. - 11PROPERTIES OF METALS+high bp/mp
+strong
+conduct heat and electricity
+dense
+malleabe - 12PROPERTIES OF NON-METALS+low bp/mp
+not as strong as metals
+doesn't conduct
+not as dense
+brittle - 13GROUP 0-noble gases
-unreactive as they are energetically stable
as you go down:
+atomic mass
+boiling point because more electrons= stronger intermolecular forces - 14GROUP 1 PROPERTIES-alkali metals (positive ions)
-high bp
-reactive
-low density
-good conductor
-shiny - 15GROUP 1 AS YOU GO DOWN...+more electrons
+more reactive (easier to lose electrons as theres more electron shielding)
+lower bp/mp (weaker metallic forces between nuclei and outer shells) - 16GROUP 7 PROPERTIES-halogens (gain electrons)
-reactive
-diatomic
-dont conduct - 17GROUP 7 AS YOU GO DOWN...+electrons
+lower reactivity (more shielding = harder to gain electrons)
+higher bp/mp (more electrons= stronger intermolecular forces) - 18LITHIUM+OXYGEN4Li+02=2LI2O
+Burns with strong red flame
+Product = lithium oxide - 19SODIUM+OXYGEN4Na+O2= 2Na2O
+burns with orange flame
+product=sodium oxide - 20POTASSIUM+OXYGEN4K+O2=2K2O
+doesn't burn, just melts
+product= potassium oxide - 21LITHIUM+CHLORINE2Li+Cl2=2LICl
-white powder/salt produced
-product: lithium chloride - 22SODIUM+CHLORINE2Na+Cl2=2NaCl
-white powder/salt produced
-product: sodium chloride - 23POTASSIUM+CHLORINE2K+Cl2=2KCl
-white powder/salt is produced
-product:potassium chloride - 24LITHIUM+WATER2Li+2H2O=2LiOH+H2
-floats, fizzes, dissolves
product: lithium hydroxide+hydrogen - 25SODIUM+WATER2Na+2H2O=2NaOH+H2
-Forms a ball, floats,fizzes, burns orange flame
products: sodium hydroxide+hydrogen - 26POTASSIUM+WATER2K+2H2O=2KOH+H2
-melts and floats quickly, burns with lilac flame
products: potassium hydroxide+hydrogen - 27TRANSITION METALS VS ALKALIALKALI
-reactive
-low density
-strong
-lower than bp/mp
TRANSITION
-not as reactive
-high density
-weaker
-higher bp/mp
Informações
- Descrição
- 2º de ESO Física y Química FlashCards sobre ATOMIC STRUCTURE AND PERIODIC TABLE, criado por mencia castaño em 04-05-2019.
- Criado por
- mencia castaño
- Visualizações
- 1
- Avaliação