Flashcards
C4: Chemical Patterns
Flashcards do conjunto (22)
- 1Atoms of different elements have different...Proton numbers
- 2Arranging elements in order of their proton numbers is called...Periodicity - repeating patterns of their properties
- 3What early attempts to link elements together were dismissed by the scientific community?Döbereiner's triads - linked in threes with average RAM in middle
Newlands' octaves - linked by every eighth with similar properties - 4What did Mendeleev's Periodic Table enable him to do?Predict the properties of newly discovered elements - their relative atomic mass and chemical properties
- 5What is a group on the periodic table?Vertical column - elements have similar properties
- 6How can you use a Periodic Table to classify if an element is a metal or a non-metal?Which side element is on - left is metal and right is non-metal
- 7What are the chemical symbols for Group 1 metals?Lithium = Li
Sodium = Na
Potassium = K - 8What happens when alkali metals are cut?Tarnish - become dull due to a layer of oxide
- 9Describe the reactions of lithium, sodium and potassium with waterReacts vigorously - releases hydrogen gas and a metal hydroxide in an alkaline solution (MOH)
- 10What are compounds of alkali metals with chlorine called?Salts - crystalline solids, soluble in water
- 11What's the pattern of Group 1 alkali metals as you go down the group?Becomes more reactive - melting/boiling points decrease as you go down the group
- 12What are the precautions necessary for working with Group 1 metals?Can react with water - wear protective gloves and goggles
- 13What are the chemical symbols for Group 7 halogens?Chlorine = Cl
Bromine = Br
Iodine = I - 14What are the states of Group 7 halogens at room temperature?Chlorine - green gas, toxic
Bromine - red liquid, toxic and corrosive
Iodine - purple solid, harmful - 15What do halogen molecules consist of?Diatomic molecules
- 16What happens in displacement reactions?Alkali metals - chlorine +sodium bromide -> sodium chloride +bromine
Iron - glows more with chlorine that it does bromine and iodine - 17What precautions need to be taken when dealing with Group 7 halogens?Toxic gases - eye protection and fume cupboard
Corrosive - chemical resistant gloves - 18What's the formulae for hydrogen, water and halogen?Hydrogen - H(little 2)
Water - H(little 2)O
Halogen - Cl(little 2), Br(little 2), I(little 2) - 19Chlorides, bromides and iodides for lithium, sodium and potassiumLiCl (lithium chloride)
NaCl (sodium chloride)
KCl (potassium chloride) - 20Write balanced symbol equation for sodium and watersodium + water -> sodium hydroxide + hydrogen
2Na + H2O -> 2NaOH +H2 - 21What's the structure of an atom?Nucleus - protons and neutrons
Outside - electrons in shells - 22What's the relative masses and charges of protons, neutrons and electrons?Proton - RAM 1, charge +1
Neutron - RAM 1, charge 0
Electron - RAM 0.0005, charge -1
Informações
- Descrição
- FlashCards sobre C4: Chemical Patterns, criado por Theamae Garcia em 09-08-2015.
- Criado por
- Theamae Garcia · ago 2015
- Atualizado
- 13 mar 2016
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