Chemistry Flashcards

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1
Q

What can limestone be used for?

A

A building material

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2
Q

What carbonates decompose by heating in a similar way?

A

Magnesium, copper, zinc, calcium and sodium

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3
Q

Calcium oxide reacts with water to produce heat?

A

Calcium hydroxide- alkali- used in neutralisation of acids

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4
Q

How is calcium carbonate produced?

A

A solution of carbon hydroxide in water reacts with carbon dioxide

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5
Q

Carbonated react with acids to produce what?

A

Carbon dioxide (salt and water)

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6
Q

How is cement, motar and concrete made?

A

Limestone is heated with clay
Cement is mixed with clay to form motar
Cement is mixed with sand and aggregate to make concrete

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7
Q

What are most metals found as?

A

Compounds that require chemical reactions to extract the metal

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8
Q

How can copper be extracted

A

Heating the ores in a furnace (smelting)

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9
Q

What does the rate at which an object transfers energy by heating depend on?

A

Surface area and volume

The material of the object

The nature of the objects surface with which the object is in contact with

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10
Q

What is limestone mainly composed of?

A

Calcium carbonate CaCO3

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11
Q

What are the two ways metals can be extracted?

A

Reduction with carbon- metals that are less reactive

Electolysis- metals that are more reactive than carbon

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12
Q

What is cracking?

A

It’s where you make the bigger molecules smaller, to make them more useful

Broken down by heating them as they pass over a catalyst

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13
Q

Elements in the same vertical column are sometimes called ‘families’ Why?

A

They have similar properties/characteristics just like people in a family

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14
Q

What are horizontal rows on the periodic table called?

A

Periods

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15
Q

What is the specific heat capacity of a substance?

A

The amount of energy needed to change 1kg of an object by 1 degree

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16
Q

How can calcium carbonate be decomposed?

A

By heating it (thermal decomposion)