Term
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Definition
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Term
| an alkali has a ........ pH |
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Definition
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Term
| How do catalysts help a reaction? |
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Definition
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Term
| What does a high atom economy mean? |
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Definition
| Most of the starting materials end up as useful products |
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Term
Complete the equation below
H+ + OH- --> ........ |
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Definition
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Term
| How can you make a reaction take place quicker? |
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Definition
use a more concentrated acid
high pressure
high temperature
larger surface area
use a catalyst |
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Term
| slicon has a ....... melting point |
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Definition
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Term
| what type of bonding is present in silicon dioxide? |
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Definition
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Term
| cold packs work because heat energy......... |
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Definition
| is taken in from the surroundings |
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Term
| name the three parts of the atom[image] |
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Definition
protons (+)
neutrons
electrons(-) |
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Term
| where does the nitrogen and hydrogen come from in the Haber process |
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Definition
nitrogen from the air
hydrogen from methane (natural gas) |
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Term
| How is a nanoparticle different form a normal atom |
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Definition
it is much smaller
and has a larger surface to volume ratio |
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Term
What is the formula mass of SnF2
F=19 and Sn =119 |
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Definition
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Term
| Calculate the percentage by mass of fluorine in SnF2 |
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Definition
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Term
| How can a fluorine atom change into a fluoride ion? |
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Definition
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Term
| How is electrolysis used to make pure copper from impure copper (4 points) |
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Definition
impure copper is the anode
pure copper forms at the cathode
Copper sulphate solution is used
copper forms positive ions
impurites fall to the bottom
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