Topic C2:Elements, Compounds and Mixtures; Flash Questions

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  • Created by: MiriamL
  • Created on: 03-04-20 11:41
What is a solute if it dissolves in the solvent?
Soluble
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What is a solute if it can't dissolve in the solvent?
Insoluble
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How does distillation work?
Heating the solution so the solvent becomes a gas. The solvent flows down a condenser which cools it so it turns back into a liquid
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What is the stationary phase in paper chromatodraphy?
Absorbent paper
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What is the stationary phase in thin layer chromatography?
Thin layer of silica or powedered aluminium spread over a layer of glas sor plastic
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What is the stationary phase in gas chrmotography?
Thin layer of silica or powedered aluminium packed into a metal column
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What is the mobile phase in gas chrmotography?
Unreactive carrier gas i.e Nitrogen
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What is the mobile phase in thin layer chromatography?
Solvent
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What is the mobile phase in paper chromatodraphy?
Solvent (water or propanone)
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Metal or non metal? Electrical conductors
Metal
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Metal or non metal? Thermal conductor
Metal
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Metal or non metal? Dull
Non-metal
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Metal or non metal? Usually solid at room temperature
Metal
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Metal or non metal? Thermal insulators
Non-metal
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Metal or non metal? Oxides are bases
Metal
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Metal or non metal? Hard and strong
Metal
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Metal or non metal? Malleable and ductile
Metal
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Metal or non metal? Electrical insulators
Non-metal
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Metal or non metal? Brittle
Non-metal
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Metal or non metal? High density
Metal
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Metal or non metal? Solids, liquids, and gases at room temperature
Non-metal
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Metal or non metal? Oxides are acids
Non-metal
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Metal or non metal? Shiny when polished
Metal
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Metal or non metal? Low melting points
Non-metal
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Metal or non metal? Low density
Non-metal
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Metal or non metal? Magnetic
Some metals
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Metal or non metal? Not malleable and not ductile
Non-metal
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How many electrons are there in the first shell?
2
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How many electrons are there in the second shell?
8
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How many electrons are there in the third shell?
8
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What can simple molecules be shown by?
Dot and cross diagrams
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What shell is shown on dot and cross diagrams?
Outer
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What links do some polymers have and what are they?
Cross links. Covalent bonds
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What does having covalent cross links mean for the polymer?
Its stronger and has higher melting and boiling points
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What happens to electrongs in metallic bonding?
Leave the outer shell forming a see of delocalised electrons around positively charged ions
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What three pieces of evidence did mendeleev consider about the elements?
Atomic weights of known elements. Knowledge of chemical reactions of the elements. Knowledge of physical properties of the element.
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What Mendeleev arrange them in order of?
Atomic weight
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WHat elements did he group together?
Elements with similar chemical properties.
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What two elements did he swap around and why?
Iodine and tellurium. He felt it matched their chemical properties better
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What did he leave gaps for?
Elements he thought existed and predicted their properties
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Who discovered argon and when?
Lord Rayleigh and William Ramsay in 1984
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What did Ramay discover in 1985?
Helium?
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What did Mendeleev believe about Helium and Argon?
They weren't elements becasue they were inert
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What had Ramay dsicovered by 1898?
Three more noble gases
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What Ramay believe they formed?
A new goup of elements
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What mendeleev do?
Accepted they were elements and placed them next to group 7 in the periodic tab;
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When did Mendeleev die?
1907
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When was the proton discovered?
1913
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What did this mean for his atomic number?
It was just a position in the periodic table
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Who discovered the atomic number was actually the number of protons?
Henry Moseley
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What did Moseley's work show?
7 gaps in the periodic table and Mendeleev was right to swap iodin and tellurium.
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What are allotropes?
Different froms of an element in the same state but with different atomic arrangements?
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Why are diamond and graphite different?
Because of their structure and bonding
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In diamond how and how manys are the carbons bonded to?
Each carbon is covalenty bonded to 4 other carbons
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What does this make diamond?
Hard
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Why doesn't diamond conduct electricity?
It has no delocalised electrons
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How is carbon bonded in graphite?
Each carbon is bonded to 3 other carbons
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What happens to the other electron and what does this mean for graphite?
It becomes delocalised. Graphite can conduct electricity.
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Why does graphite have a high melting point?
It has many interlocking hexagons with strong covalent bonds
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Why is graphite slippery?
The forces between each of its layers are weak and can slide over each other. This makes it rub off on paper
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What is graphene?
A carbon alotrope that resembles a single layer of graphite.
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What are fullerenes?
A large family of carbon allotropes in which the molecules are shaped like tubes or balls
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What do nanotubes look like and what are they used for?
Resemble a sheat of graphene rolled up. Used to reinforce sports equiptment
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What does look like?
A sheet of graphene closd to make a hollow ball. Carbon atomes may be in pentagons as well as hexagons.
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What does the melting and boiling points of a material depend on?
Strength of the bonds
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What is the diference between something that is brittle and ductile?
How easily the particles in the structure can change their positions
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Why are metals ductile?
The layers in the lattice can slide over each other, as the elctrons are delocaised and no bonds are actuallt broken
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What happens in a giant, covalent or ionic structure if a large force is applied?
A large number of bonds break at once so the materials break
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What are nanoparticles used for?
Paints, cosmetics, medicines and sunscreen adn catalysts to speed up reactions
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What are ionic equations often used to describe?
Precipitation reactions
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Other cards in this set

Card 2

Front

What is a solute if it can't dissolve in the solvent?

Back

Insoluble

Card 3

Front

How does distillation work?

Back

Preview of the front of card 3

Card 4

Front

What is the stationary phase in paper chromatodraphy?

Back

Preview of the front of card 4

Card 5

Front

What is the stationary phase in thin layer chromatography?

Back

Preview of the front of card 5
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