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12 Cards in this Set

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WHAT ARE THE MOST COMMON FOSSIL FUELS?

COAL, CRUDE OIL, NATURAL GAS.

HOW FOSSIL FUELS WERE FORMED?

THEY WERE ALL FORMED IN SIMILAR WAYS


OVER MILLIONS OF YEARS. A FUEL, MAINLY


HYDROCARBON, IS FORMED BY THE


DECOMPOSITION OF DEAD BURIED REMAINS


OF ORGANIC MATTER OVER MILLIONS OF


YEARS IN ABSENCE OF AIR, UNDER HEAT AND


PRESSURE. THEY RELEASE A HUGE AMOUNT


OF ENERGY ON BURNING.

HOW WAS COAL FORMED?

COAL WAS FORMED FROM THE REMAINS OF


TREES AND OTHER PLANTS THAT DIED IN


SWAMPS OVER MILLIONS OF YEARS UNDER


THE CONDITIONS OF HEAT, PRESSURE AND


IN THE ABSENCE OF AIR. IT IS DEEP


UNDERGROUND AND WE HAVE TO OBTAIN IT


BY MINING.

HOW WAS OIL AND NATURAL GAS FORMED?

CRUDE OIL AND NATURAL GAS WERE


FORMED FROM SEA CREATURES THAT DIED


AND FELL INTO THE SAND ON THE SEA BED,


OVER MILLIONS OF YEARS, UNDER THE


CONDITIONS OF HEAT, PRESSURE AND IN


THE ABSENCE OF AIR. THEY ARE DEEP


UNDERGROUND AND WE HAVE TO OBTAIN


THEM BY DRILLING.

WHAT IS THE ORIGINAL SOURCE OF ALL


THE ENERGY IN FOSSIL FUELS?



THE PLANTS AND SEA CREATURES THAT


FORMED THE FOSSIL FUELS, ALL OBTAINED


THEIR ENERGY FROM THE SUN BY


PHOTOSYNTHESIS. THAT MEANS THE


ORIGINAL SOURCE OF ALL THE ENERGY IN


FOSSIL FUELS IN THE SUN.

WHAT IS THE COMPOSITION OF THE FOSSIL


FUELS?

CRUDE OIL AND GAS ARE MAINLY MIXTURES


OF HYDROCARBONS (COMPOUNDS MADE UP


OF HYDROGEN AND CARBON ONLY).


COAL CONSISTS MAINLY OF CARBON,


HYDROGEN AND OXYGEN, BUT ALSO


CONTAINS SMALL AMOUNTS OF SULPHUR.


NATURAL GAS CONSISTS OF METHANE.

WHAT IS THE REASON THAT WE BURN


FOSSIL FUELS?

THE MAIN REASON THAT WE BURN FOSSIL


FUELS IS TO RELEASE ENERGY. THEY RELEASE


A GREAT DEAL OF ENERGY WHEN THEY


BURN.

WHAT IS A COMPLETE COMBUSTION


OF FUELS?

WHEN A SUBSTANCE BURNS IN EXCESS


AMOUNT OF OXYGEN, IT IS CALLED


COMPLETE COMBUSTION.

WHAT IS AN INCOMPLETE COMBUSTION


OF FUELS?

SOMETIMES THERE IS NOT ENOUGH OXYGEN


FOR A SUBSTANCE TO BURN COMPLETELY.


IT IS KNOWN AS INCOMPLETE COMBUSTION.


FOR EXAMPLE, WHEN A HYDROCARBON


UNDERGOES AN INCOMPLETE COMBUSTION,


A CARBON MONOXIDE AND / OR CARBON


(SOOT) IS FORMED INSTEAD OF CARBON


DIOXIDE.

WHAT IS FORMED FROM THE COMPLETE


COMBUSTION OF HYDROCARBON?

THE ANHYDROUS COPPER SULPHATE TURNS


FROM WHITE TO BLUE WHEN PLACED IN


A TUBE IN ICE BATH AND HEATED UP,


PROVING THAT WATER IS PRODUCED.


THE PRODUCED GAS IS PASSED THROUGH


LIMEWATER, WHICH TURNS CLOUDY,


PROVING THAT CARBON DIOXIDE IS PRODUCED

WHAT IS THE WORD EQUATION FOR THE


COMPLETE COMBUSTION OF ANY


HYDROCARBON?

HYDROCARBON + OXYGEN -------------------




WATER (HYDROGEN OXIDE) + CARBON DIOXIDE

WHAT IS THE WORD EQUATION FOR


AN INCOMPLETE COMBUSTION OF ANY


HYDROCARBON?

HYDROCARBON + OXYGEN ------------------


WATER + CARBON MONOXIDE




HYDROCARBON + OXYGEN ------------------


WATER + CARBON