Chemistry

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Do atoms have a positive or negative nucleus
Positive charge
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Do electrons have a positive or negative charge?
Negative charge
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If an atom loses and electron what charge does it have?
Positive charge
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If an atom gains and electron what charge does it have?
Negative charge
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Charged atoms are known as....?
Ions
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If a positive and negative ion meet they will be ....? to make..?
Attracted to make an ionic bon
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What is another main type of bond ?
A covalent bond
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What do atoms in a covalent bond share?
A pair of electrons
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Antioxidants are used for ...?
preserving foods
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Emulsifiers are used for ...?
blending water and oil together in foods like salad cream and ice cream.
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Hydrophilic ?
Likes Water
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Hydrophobic?
Hates water
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Hydrophobic tail or head?
Tail - Hydrophillic head
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When you heat baking powder, what is the process it undergoes ?
Thermal Decomposition
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What would help and speed up thermal decomposition
A catalyst
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What do you heat with an alcohol to make an ester?
Organic acid/ Carboxylic acid
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What is the equation for making an ester?
Acid+Alcohol ~ Ester+Water
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Name 3 properties a perfume must have
1)Easily Evaporates 2) Non-toxic 3) Doesnt react with water 4)doesnt irritate the skin 5)insoluble in water
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How easily a liquid evapourates is called....?
Volatility
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Soloution?
It is a mixture of the solute and solvent that does not seperate out.
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solute?
Its a substance being dissolved
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solvent?
it is the liquid its dissolving into
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soluble
Means it will dissolve
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insoluble
Means it will NOT dissolve
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Solubility
Measure of how much will dissolve
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What does paint usually contain?
Solvent, Binding Medium and pigment
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The pigment gives the paint...?
Colour
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What do thermochromic pigments do?
They change colour or become transparent when heated or cooled
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Polymers are formed when small mollecules called ...... join together
Monomers
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The reaction polymerisation needs a high....
pressure and a catalyst
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Plastics and polymers are usually ..... based
Carbon
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Monomers that make up addition polymers have a ........ covalent bond
Double
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Molecules with at least one double covalent bond between carbon atoms are called
unsaturated compounds
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molecules with no double bond between carbon atoms are called?
Saturated compounds
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Other cards in this set

Card 2

Front

Negative charge

Back

Do electrons have a positive or negative charge?

Card 3

Front

Positive charge

Back

Preview of the back of card 3

Card 4

Front

Negative charge

Back

Preview of the back of card 4

Card 5

Front

Ions

Back

Preview of the back of card 5
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