Chemistry

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Define a compound.
A substance which has two or more elements which are chemically bonded.
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What bond forms with the sharing of electrons?
Covalent bonding.
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What bonding is formed with the transfering of electrons?
Ionic bonding
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Define Ion.
A charged particle produced by the loss or gain of electrons.
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What is the arrangement called of ionic bonds between charged particles.
Giant lattice.
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What is the overall charge on any ionic compound?
0
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What is the charge on a sulphate?
2-
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What charge is on a carbonate?
2-
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What is the charge on a nitrate?
-
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What is the charge on a hydroxide?
-
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Give some examples of giant covalently bonded structures.
Diamond, graphite and silicon dioxide.
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What are the properties of metallic bonding?
A sea of delocalised electrons and a strong electro-static attraction.
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Do ionic compounds have high or low melting points?
A high melting point.
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What is the state of ionic solid?
It cannot move, but it can vibrate. It keeps a solid structure, and cannot conduct electricity.
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What is the state of a molten ionic compound?
It can move freely,and can conduct electricity.
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What is the state of an ionic compound in an ionic solution?
It can conduct electricity and can move freely in the water.
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Do simple covalently bonded structures have high or low melting point.
Low
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What is the properties of diamond and silicon dioxide?
High melting point, high boiling point, hard, cant conduct electricity and is soluble.
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Properties of graphite.
Slide easily because there are no covalent bonds between the layers. Can conduct electricity with delocalised free electrons. Soft.
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What is an alloy?
Usually a mixture of , such as bronze (copper and tin)
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What are the conditions for low density poly-ethene?
High pressures and a trace of oxygen.
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What are the conditions for high density poly-ethene?
Slightly raised pressure, a catalyst and 50 degrees.
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What are the 3 sub-atomic particles and their relative mass?
Protons = 1 Neutron = 1 Electron = Negligible.
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Define isotope.
Atoms of the same element with a different number of neutrons.
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What is the equation for percentage yield.
(Produced Produced / Total amount of product possible) *100
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An example of a reversible reaction.
Haber process or freezing water
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Give an analysis technique that is used to detect food additives.
Chromatography.
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Define retention time.
The time it takes for a component in a mixture to pass through the column during gas chromatography.
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What analysis is used to find the relative molecular mass of a compound?
Mass Spec
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What is the peak called that gives the relative molecular mass of a compound?
Molecular iron peak.
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How do you work out rate of reaction?
Amount of product formed / time.
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What 4 factors affect the rate of chemical reactions?
Concentration of substance, temperature, catalyst and surface area.
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What is a reversible reaction?
A reaction where elements A+B = C+D and then C+D = A+B.
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Is ammonia nitrate + water an endothermic reaction or an exothermic reaction?
Endothermic Reaction
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Give two examples of exothermic reactions.
Burning fuels and respiration.
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Card 2

Front

What bond forms with the sharing of electrons?

Back

Covalent bonding.

Card 3

Front

What bonding is formed with the transfering of electrons?

Back

Preview of the front of card 3

Card 4

Front

Define Ion.

Back

Preview of the front of card 4

Card 5

Front

What is the arrangement called of ionic bonds between charged particles.

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Preview of the front of card 5
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