science C3

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what are atoms made up of?
even smaller particles
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atoms can join together to make.....
Molecules
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what is it called when an substance only has one type of atom?
element
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what is it called when a substance is made up of different types of atoms
compound
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a covalent bond is.....
when atoms share a pair of electrons
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a ionic bond is when.....
a positve ion meets a negative ion and they are attracted to each other.
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what is a exothermic reaction?
when energy is given out
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what is a endothermic reaction?
energy is taken in
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there is a temperature rise during a reaction, is the reaction exothermic or endothermic?
exothermic
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you can find out how much energy a fuel contains by using a....
calorimetric method
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what one of the most fastest reaction?
burning and an explosion
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what one of the most slowest reactions?
rusting of iron
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when does a reaction stop?
when the limiting reactant is used up
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what is the limiting reactant?
it is the reactant thats totally used up at the end of the reaction
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what is the relative atomic mass?
it is the the bigger number, the one top.
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a reaction produces a gas. how could you measure the rate of reaction?
you can measure the volume of the mass. you need a flask, a gas syringe and a stopwatch.
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what four things affect the rate of reaction?
temperature, catalyst, concentration and increasing the suface area.
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what does 100% atom economy mean?
it means that all the atoms in the reactants have been turned into useful products.
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how do you work out atom economy?
M of desired product products - divided by - m of all products -times 100
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what are four ways tha you can lose product or reactant?
evapouration, fliteration, transferring liquids and not everything will react to make product
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what is continous production? and why do we do it
when the production never stops and we do it for chemicals that we need alot of.
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why are pharmaceutical drugs made in batch processes
because we only need small amounts
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what three factors increase the price of pharmaceutical drugs?
research and testing, labour costs, energy costs, raw materials, taken time for development, marketing
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describe how you would extract a chemical from a plant
Crush the plant to realese the chemical. Boil it in a suitible solvent to dissolve the chemical. Use chromatography to separate out the chemical you want.
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explain why graphite is ideal as a lubricating metal.
the layers of grapite can be slippery and can be rubbed off onto paper.
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Other cards in this set

Card 2

Front

atoms can join together to make.....

Back

Molecules

Card 3

Front

what is it called when an substance only has one type of atom?

Back

Preview of the front of card 3

Card 4

Front

what is it called when a substance is made up of different types of atoms

Back

Preview of the front of card 4

Card 5

Front

a covalent bond is.....

Back

Preview of the front of card 5
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