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How do you write the formula of ammonia? |
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ammonia can be described as
an ion
a molecule or
an ion |
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| what type of bonding is there in a molecule of methane |
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| how many different elements are there in silicon dioxide |
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| diamond, graphite and silicon dioxide all have which type of bonding |
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| Which element makes up diamond? |
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| an exothermic reaction is one which..... |
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| what is the formula of magneisum oxide |
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| When magnesium oxide reacts with hydrochloric acid which salt is formed? |
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| electrolysis takes place when electricity passes through..... compounds when they are molten or in solution |
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| During electrolysis the compound is broken down to form....... |
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| Name the two gases produced during the electrolysis of sodium chloride solution |
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| hydrogen gas and chlorine gas |
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| What useful solution is formed from the electrolysis of sodium chloride? |
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complete the word equation for the Haber process
nitrogen + _______<=>________ |
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| what does the <=> symbol mean |
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| Why is there iron in the reactor |
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| it is a catalyst to make the reaction take place faster |
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| What is done with the unreacted nitrogen and hydroen? |
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| they are recycled to save resources and money |
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| Why are ammonia factories normally near towns? |
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provides workers
good transport links
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| Why does an increace in temperature increace the rate of reaction |
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Any three from:
particles have more energy
move faster
collide more often
more chance of collisions
bump into each other more
collide with more force / energy
more particles have the activation energy
more collisions result in reaction
more collisions are successful
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| Why can metals be bent and hammered into shape? |
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they are made of layers
atoms / ions / particles / layers (of atoms) can slide over each other
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| What size are nano particles? |
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smaller / tiny or very small
correct size range 1 to 100 nanometre
a few hundred atoms in size
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what is the precentage of nitrogen in potassium nitrate(KNO3)
Mr = 101 N=14 |
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