C1 Revision

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Q1 ­ Is the nucleus of an atom positive or negative?
Q2 ­ What are charged atoms known as?
Q3 ­ What is the formula of hydrochloric acid and sodium carbonate?
HCl and Na2CO3
Q4 ­ How do you find the molecular formula?
Use the displayed formula and count the different types of atoms and how many there are
Q5 ­ What are additives used for?
To make them last longer
Q6 ­ What does an antioxidant do?
It helps to preserve the food
Q7 ­ Draw and label an emulsifier molecule with its properties
It should have a head and a tail
It should be labelled with a hydrophobic tail and a hydrophilic head
It should have said if it was attracted to oil or water or vice versa
Q8 ­ What foods are easier to digest when they are cooked ­ give examples
Flour containing products
Q9 ­ Is cooking a physical or chemical change?
Q10 ­ What process does baking powder go under when it is heated?
Thermal decomposition
Q11 ­ What is an ester?
Esters are chemicals that smell nice and are used for perfumes and air fresheners
Esters can be manufactured synthetically to use as perfumes or flavourings
They can be found naturally in nature
They are made by esterification

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Q12 ­ What properties do perfumes need?
Easily evaporates
Doesn't react with water
Doesn't irritate the skin
Insoluble in water
Q13 ­ Why is animal testing used on cosmetics and perfumes?
They are similar to humans and will react in a similar way
To check it will not harm humans
Q14 ­ Why is it bad to test them on animals?
It can cause suffering on the animals
It can be cruel
It may not be conclusive to see if they harm humans
They…read more

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Q21 ­ What is a pigment?
The pigment gives the paint its colour
Q22 ­ What is a colloid?
A colloid consists of really tiny particles of one kind of stuff dispersed in another kind of stuff.
They are mixed in but not dissolved.…read more

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Q32 ­ What is fractional distillation?
It is where crude oil is separated into different hydrocarbon fraction
Q33 ­ Where is the hottest in the fractional distillation? Top, middle or bottom
Q34 ­ Why is cracking used?
To split up long chained hydrocarbons
To make available more short chained hydrocarbons
Q35 ­ What conditions are needed for cracking?
Q36 ­ What is crude oil mainly used for?
Generating electricity
Q37 ­ Are crude oils renewable? What does this mean?
This…read more

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Carbon monoxide
Q42 ­ What percentage of the earth's gases is nitrogen?
Q43 ­ What is acid rain caused by?
Sulphur dioxide
Oxides of nitrogen
Q44- What does acid rain kill?
Trees…read more


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