Chemistry C2

What type of structure do metal atoms form?

Giant crystalline structure

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What do metal structures contain that allow them to conduct electricity and heat easily?

A sea of free electrons

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List three properties you would expect a transition metal to have.

Good conductor of heat; good conductor of electricity; high melting and boling points

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What is the difference between theoretical yield and actual yield?

Theoretical yield: Calculated from relative masses of reactants and products. Actual yield: Actual mass of useful product obtained from a given amount of reactant.

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How would you show that the chemical reaction between sodium and chlorine is exothermic?

The reaction gives out heat energy.

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Describe how the energy involved in making and breaking bonds accounts for exothermic reactions.

Energy is given out when the bonds are made in the products. More energy is released making bonds than energy is needed to break bonds

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Why is helium used in weather balloons and airships?

Helium is inert and is less dense than air; it will therefore float.

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Why does a lower concentration of particles result in a slower rate of reaction?

There are fewer particles in the solution and so less chance of the particles colliding.

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How does using a catalyst affect a rate of chemical reaction?

A catalyst reduces the minimum amount of energy needed for the reaction to happen; this means there will be more successful collisions.

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Ionic bonds are formed between which two types of atom?

Ionic bonds are formed between metal atoms and non-metal atoms.

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An ionic bond involves what?

An ionic bond involves transfer of electrons.

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Diamond and graphite are two different forms of carbon. Describe the structure and properties of Diamond.

Diamond has a giant molecular structure. Each of the carbon atoms form four covalent bonds which makes it very hard.It has a very high melting point but cannot conduct electricity as it has no available electrons.

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Diamond and graphite are two different forms of carbon. Describe the structure and properties of Carbon.

Carbon atoms are covalently bonded to three other carbon atoms; the fourth electron from each atom can freely move around. Electricity is therefore conducted. The atoms within the structure are in layers that slide past each other-Pencils & lubricant

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State three ways the rate of a chemical reaction can be changed

Catalyst; Temperature; Concentration

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Chemistry C2

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