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18 Cards in this Set
- Front
- Back
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which element of group 2 ,have the highest ionisation energy
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It is neon , because the effective nuclear charge increase cross the period,the shielding stay the same.
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which two elements in period two deviate from the general trend
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Boron and oxygen
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How and Why boron deviate from the general trend
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Lower
the outer electron in boron is in a higher energy 2p subshell which making it easier to loss an electron |
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Predict whether an atom of 88Sr will have an atomic radius that is larger than, smaller
than or the same as the atomic radius of 87Rb. Explain your answer. |
88Sr have smaller atomic radius than Sr, this is because the effective nuclear charge in greater in Sr,but the shielding stay the same, which the nucleus is able to attract and pull the in the outer electrons more
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Name a process used to obtain a sample of alkene from a mixture containing other
members of the same homologous series. |
Fractional distillation
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State the name of the process used to obtain a high yield of alkene from C15H32
Give one reason why this process is used in industry. |
Thermal cracking
To produce products that are in greater demand / more valuable / more expensive / more profitable |
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Suggest the formula of a reagent that could be added to Alkene in order to convert it into alkene.
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H2
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When a sample of Y, contaminated with CH3SH, is burned completely in air, a toxic gas
is formed. Identify this toxic gas and suggest a compound that could be used to remove the toxic gas from the products of combustion. |
It is a toxic GAS- sulfur dioxide
use Calcium oxide / CaO / lime / quicklime to remove this gas this reaction is called neutralisation CaO + SO2→ CaSO3 |
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Explain why the boiling points of C4H8 and C4H10 are similar.
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(Molecules) are similar sizes / have similar Mr / have similar number of electrons
Similar van der Waals forces between molecules / similar intermolecular forces (IMF) |
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Although phosphine molecules contain hydrogen atoms, there is no hydrogen bonding
between phosphine molecules. Suggest an explanation for this. |
P not as electronegative as N, O and F
Difference in electronegativity between P and H is too small |
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Deduce the type of crystal structure shown by graphene.
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Macromolecular
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Suggest why graphene is an excellent conductor of electricity.
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In graphene each carbon atom makes three covalent bonds so there's one free electron per carbon atom which is able to move through the structure,these delocalise electron are why graphite conduct electricity
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State the type of crystal structure shown by titanium.
(metal) |
giant metallic
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Explain, in terms of its structure and bonding, why titanium has a high melting point.
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Titanium have giant metallic structure which contain many strong metallic bond,metallic bond is the attraction between the nuclei of ion and the delocalised electrons,which is strong
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Suggest why titanium can be hammered into different shapes.
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Layers of atoms/ions slide over each other
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Titanium can be hammered into objects with different shapes that have similar
strengths.Suggest why these objects with different shapes have similar strengths. |
same (metallic) bonding as before being hammered
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Boron trichloride can also be prepared from its elements.
Write an equation for this reaction. Explain why boron trichloride has a trigonal planar shape with equal bond angles. |
B + 3Cl2 → 2BCl3
this shape is due to the matual repulsion of 3 bond pairs of electrons as far as possible,so it repel equally therefore have same bond angle. |
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Boric acid (H3BO3) can react with sodium hydroxide to form sodium borate and water.
Write an equation for this reaction. |
H3BO3 + 3NaOH Na3BO3 + 3H2O
accept : H3BO3 + NaOH → NaBO2 + 2H2O |
