SHAPES AND MOLE5
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| STRAND OF DNA HELD TO OTHER BY | HYDROGEN BONDS.
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| THE BASE ADENINE LINKED TO THYMINE IN OTHER STRAND | BY 2 HYDROGEN BONDS
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| CYTOSINE AND GUANINE HELD | BY 3 HYDRO BONDS.
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| PHYSICAL PROPERTIES: DEPEND ON | FORCES E.G. MELTING A SOLID
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| A SOLID CONSIST OF A | REGULAR ARRANGEMENT OF PARTICLE WHICH VIBRATE ABOUT A FIXED POINT AND CANNOT MOVE.
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| WHEN N SOLID HEATED VIBRATION | INCREASED TEMPERATURE RISES, WHEN MELTING TEMPERATURE REACHED THE STRUCTURE OF SOLID BREAKS.
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| AS HEATING CONTINUOUS MORE SOLID MELTS | TEMP STAYS SAME UNTIL SOLID HAS MELTED.
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| WHEN MOLTEN THE PARTICLE | FREE TO MOVE AROUND.
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| IF FORCES BETWEEN PARTICLES ARE STRONG | MUCH ENERGY IS REQUIRED TO BREAK DOWN THE STRUCTURE OF THE SOLID =HIGH MELTING POINT.
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| BOILING A LIQUID IN LIQUID THE PARTICLES ION ATOMS MOLECULES | ARE CLOSE TOGETHER BUT POSITIONS ARE RANDOM AND THEY TUMBLE OVER EACH OTHER. PARTICLE MOVE AT DOFF SPEEDS AND COLLIDE.
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| WHEN LIQUID IS HEATED | THE PARTICLE GAIN KINETIC ENERGY AND SPEED INCREASES. SOME PARTICLES MOVE FAST T ESCAPE AS GAS –(EVAPORATION).
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| WHEN BOILING TEMP REACHED SOME PARTICLE | ESCAPE FROM MIDDLE OF LIQUID ,BUBBLES OF GAS PRODUCES AND LIQUID BOILS. IF THE FORCES BETWEEN THE PARTICLES STRONG MUCH ENERGY NEED TO SEPARATE = HIGH BOILING TEMPERATURE.
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| WHAT IS EVAPORATION OF A PARTICLE | WHEN THE PARTICLES MOVE SO FAST THEY ESCAPEA AS GAS.
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| AN ELECTRIC CURRENT IS | FLOW OF CHARGE (ELECTRONS ION).
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| NAME THE TYPES OF SOLID STRUCTURE (6) | IONIC, GIANT ATOMIC, METALLIC ,HYDROGEN BONDED MOLECULAR ,POLYMERIC, SIMPLE MOLECULAR.
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| HOW ARE ION ARRANGED | IONIC HAS REGULAR ARRANGEMENT – LATTICE
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| MELTING DEPENDS ON | STRENGTH OF ION ION FORCES , IONS WITH 2+ 2- HAVE STRONG FORCES.
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| IONS WITH AS SMALL RADIUS | STRONGER FORCES OF ATTRACTING THAN LARGE.
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| THE MELTING TEMP DEPENDS ON | LATTICE STRUCTURE LATTICE WITH A ION RATIO 2:1 MELT AT A LOWER TEMPERATURE THAN EXPECTED.
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| WHY DON’T IONIC SOLID CONDUCT | ION ARE FIXED IN LATTICE CANNOT MOVE. BUT WHEN MOLTEN /DISSOLVED CAN MOVE AROUND. (CONDUCT BY MOVEMENT OF CHARGE IONS), METALS ON MOVEMENT OF ELECTRONS).
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| MG2+ HAS A SMALLER RADIUS THAN CA2= SO | STRONGER FORCE OF ATTRACTION.
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| GIANT ATOMIC SUBSTANCES /NETWORK COVALENT ARE LINKED | BY COVALENT BONDS. CARBON HAS 2 MAIN FORMS- IN DIAMOND EACH CARBON ATOM HAS 4 SIGMA BONDS TO 4 OTHER CARBON IN A GIANT TETRAHEDRAL ARRANGEMENT – 109.5,
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| DIAMOND HAS HIGH MELTING PINT BECAUSE | EACH CARBON BONDED TO 4 OTHERS(COVALENTLY).
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| GRAPHITE ARRANGEMENT | EACH CARBON ATOM BONDED BY 3 OTHER BY SIGMA BONDS FORMING INTERLOCKING HEXONAL RINGS.
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| THE 4TH ELECTRON IN GARPHITE ... IS IN THE P ORBITAL WHICH FORMS | A DELOCALISED CLOUD ABOVE AND BELOW THE RINGS.
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| WHY DOES GARPHITE SLIDE | THE PLANAR RINGS ARE WEAKLY BONDED BY LONDON FORCES SO CAN SLIDE OVER EASILY.(THIS IS WHY PENCIL LEAVES A MARK).
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| THE DELOCALISE ELECTRONS ALLOW GRAPHITE | IT TO CONDUCT ELECTRICITY.
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| C60 – DISCOVERED | BY FIRING A LASER AT A DISC OF CARBON AND CONDENSING THE VAPOUR FORMED CONSIST OF 20 INTERLOCKING HEXAGONS AND 12 PENTAGON EACH CARBON HAS 3 SIGMA BONDS AND THE 4TH ELECTRON IS DELOCALISED.
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