Topic 2 Flashcards
Name the three types of rocks.
Sedimentary
Igneous
Metamorphic
What type of rock is marble?
Metamorphic
How is marble formed?
Marble is formed from limestone or chalk. Very high temperatures break down the limestone and it reforms as small crystals. This gives marble a more even texture and makes it much harder.
What type of rock is chalk?
Sedimentary
Describe the difference in the way the crystals of extrusive and intrusive rocks form?
Extrusive igneous rocks cool quickly above ground, forming small crystals. e.g. Basalt and Rhyolite.
Intrusive igneous rocks cool slowly underground, forming big crystals. e.g. Granite and Gabbro.
Name the three building materials made from limestone.
Blocks are used in cathedrals.
Fancy Carving for statues.
Crushed up and used in road surfacing.
What is thermal decomposition?
Thermal decomposition happens when one substance chemically changes into two new substances when it’s heated.
What is the symbol equation for the thermal decomposition of limestone.
CaCO3 -> CaO + CO2
How could you test for carbon dioxide in a thermal decomposition reaction?
1) Put some copper carbonate in a boiling tube and seal with a bung and connect a pipe to the middle of a lime water solution in another boiling tube.
2) Heat the carbonate over a bunsen burner.
3) If a reaction has taken place the lime water will turn cloudy and a milky colour.
What is the symbol equation for the thermal decomposition reaction of zinc carbonate?
ZnCO3 -> ZnO + CO2
What product can be made by adding water to calcium oxide?
Calcium Hydroxide, also known as lime water.
Why is the reaction of water and calcium oxide useful?
Because it is a thermal decomposition reaction.
Are atoms lost and made in a reaction or just rearranged?
Just rearranged.
If you carryout a reaction in a sealed container, what would you notice about the mass of reactants and products?
The mass is unchanged
What is a precipitate?
A precipitation reaction happens when two solutions react and an insoluable solid forms in the solution.
