Chemistry Progress Test 2

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Limestone is a example of what? And how has it been formed?
Sedimentary rock that has been formed over millions of years by the action of pressure on the remains of shelled sea creatures.( Crustaceans). The shells of these animals are crushed and subjected to high pressures to form limestone.
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What is limestone chemically?
Calcium carbonate CaCO3.
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State the 3 distinct forms of Calcium carbonate.
1. High pressure=limestone. 2. Low pressure=chalk 3. High pressures+temperatures=marble.
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Limestone will react with acids in rain water and erode over time. TRUE or FALSE?
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What are the products when Calcium carbonate reacts with hydrochloric acid?
Calcium chloride+Water+Carbon Dioxide.
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What happens to limewater when C02 is present?
Turns from clear to cloudy, precipitation reaction ( fizzing and bubbles.)
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What does the precipitation reaction produce in the limewater? What is the equation for it?
An insoluble solid within a liquid. Calcium Hydroxide(limewater)+Carbon Dioxide->Chalk(calcium carbonate)+Water.
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What is the symbol equation for limewater?
Ca (OH)2 (aq)+ CO2 (g) -> CaCO3 (s) + H2O (l)
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What is a key reaction that Calcium carbonate can undergo?
Thermal Decomposition - in these type of reactions, a substance is broken doown by the action of heat.
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Which one is right? a) all metal carbonates thermally decompose when heated. b) All metals thermally decompose or c) Only some metal carbonates thermally decompose.
a)All metal carbonates thermally decompose when heated.
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What is the word equation when Calcium carbonate is thermally decomposed?
Calcium carbonate ->(above arrow is heat) Calcium Oxide + Carbon Dioxide.
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When heat is taken in the reaction is called?
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When you add water to Calcium Oxide to covert it to Calcium hydroxide what is Calcium hydroxide also known as? And what is the heat process of this reaction?
Slaked lime. Heat energy is given out meaning it's exothermic.
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Hydroxides are not alkalis. TRUE or FALSE?
FALSE- hydroxides are always alkaline.
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How is cement made?
By heating limestone which has been crushed with clay in a large, hot oven called a rotary kiln. The kiln rotates so that the limestone and the clay can mix together and te heat causes the limestone to decompose.
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Raw materials and heat go into the rotary kiln but what comes out?
Carbon Dioxide and cement.
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The blank that is formed can be mixed with blank and blank to make mortar. Fill in the blanks.
Cement, sand, water.
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Mortar is a wet mixture that is used to stick bricks or slabs of stone together. As it dries, it hardens. TRUE or FALSE.
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How is the hard, stone-like substance called concrete made?
By mixing cement with water, sand and crushed rock.
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Re-enforced concrete is concrete that is allowed to set around .... complete the sentence.
A steel support.
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Glass + silca + sodium carbonate makes what?
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Recite the definition of a metal ore.
A metal ore is a chemical compound which contains enough of the metal to make it economically viable to extract it.
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What is th reactivity series and how is it ordered?
The reactivity series of metals list many of the most common metals in order of their reactivity. They are ordered on how they react with water, oxygen and acids.
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The least reactive metals go at the top of the series and the most reactive are at the bottom. TRUE or FALSE.
FALSE. It's the other way around.
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Most metals are found in blank combined in chemical blank such as oxides and blank. Fill in the blanks.
Nature, compounds, sulphides.
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Which few metals are found in their native states- that is the pure metal itself? And why?
Gold, silver and platinum because they are unreactive.
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How do we obtain a pure metal?
We process the ore and chemically remove the oxygen or other contaminating element.
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Metals like iron and copper are found in nature as oxides if either of these are heated with carbon, ... complete the sentence.
The carbon will remove the oxygen leaving the metallic element and producing Carbon Dioxide gas.
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What is redox?
The reduction and oxidation processes.
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What is meant by the term oxidation? Give an example.
When a substance gains oxygen, e.g Carbon + Oxygen= Carbon Dioxide.
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What is the definition of reduction?
Reduction is the removal of oxygen from a substance.
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What is a reducing agent?
The substance that gains oxygen.
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This is a large, chimney like structure about 30 metres tall. What is this a description of?
A blast furnace.
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What is added into the top of a blast furnace?
Coke ( a source of Carbon), Limestone and iron oxide.
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Hot air is blown at the... complete the sentence.
Bottom of the furnace in order to raise the temperature to close to 2000 degrees celcius.
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In the blast furnace once a certain temperature is reached the following blank reaction occurs, and blank blank is collected at the bottom of the furnace. Fill in the blanks.
Redox, molten iron.
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What is the word equation for what goes on in the blast furnace?
FeO (s) + C (s) -> Fe (l) + CO2 (g)
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The molten **** goes on top of molten iron. TRUE or FALSE?
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For metals that are above Carbon in the reactivity series what process do we use to extract them from their ores?
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What is the definition of electrolysis?
Electrolysis means the splitting up of a chemical compound by the use of electricity.
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What substances can be electrolysed?
Ionic substaances that are either melted (molten) or dissolved in water.
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What must the ions in the ionic substance be free to do ?
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In an ionic solid, the ions are held together by strong... complete the sentence.
Electrostatic forces keeping the ions in a large repeating structure called a lattice.
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In a electrolytic cell what is a) the negative electrode called? and b) the positive electrode?
a) Cathode and b) anode.
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What is the melting point of Aluminium Oxide? Also how do you reduce it?
2100 degrees celcius. A substance called cryolite is added which brings the temperature down to 1300 degrees.
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As the aluminium oxide is now a molten liquid, the ions are... complete the sentence.
Free to move around.
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When electrolysed the positive Aluminium ions move to the negative electrode. TRUE or FALSE?
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When the positive Aluminium ions move to the negative electrode what do they convert to?
Aluminium atoms.
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Other cards in this set

Card 2


What is limestone chemically?


Calcium carbonate CaCO3.

Card 3


State the 3 distinct forms of Calcium carbonate.


Preview of the front of card 3

Card 4


Limestone will react with acids in rain water and erode over time. TRUE or FALSE?


Preview of the front of card 4

Card 5


What are the products when Calcium carbonate reacts with hydrochloric acid?


Preview of the front of card 5
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