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Coal is classified as what type of material?
Coal is classified as a sedimentary rock and a fossil fuel.
Charcoal is very present in Brazilian culture. What is its most common use in our homes?
Burning on grills to roast food.
What is the main everyday use of charcoal?
Use in barbecues and domestic cooking.
Coal is very important to the world economy. What is the main use of this type of coal?
Electricity generation in thermoelectric power plants.
Coal is considered a fossil fuel. How did it form inside the Earth?
due to the accumulation and burial of plant remains over millions of years.
Coal was formed from the remains of which ancient organisms?
Plants, trees, and swamp vegetation.
Charcoal, which is widely used in our daily lives, has an organic origin. How is it produced?
Through the controlled and incomplete burning of wood.
. What is the main difference in the origin process between "coal" and "charcoal"?
Coal is a fossil fuel extracted from the ground; charcoal is man-made by burning wood with low oxygen.
Which type of coal has the lowest carbon content and lowest heating value?
Peat (initial stage)
During which geological period did most of Earth's major coal reserves begin to form?
Carboniferous Period
What is "activated carbon" (or activated charcoal) and what is its main chemical property?
It is a carbon treated to have high porosity, acting as a powerful adsorbent for impurities.
What is the main pollutant gas released into the atmosphere by burning coal?
Carbon dioxide (CO₂)
In the wood carbonization process to produce charcoal, what occurs during the "pyrolysis" phase?
Thermal decomposition of biomass occurs in the absence or scarcity of oxygen, releasing gases and concentrating stable carbon.
What are the four stages of coal evolution, and which one has the highest calorific value?
The four stages of coal evolution (from youngest to oldest) are peat, lignite, bituminous coal, and anthracite.
Besides CO₂, burning low-quality coal releases Sulfur Dioxide (SO₂). What local environmental impact does this gas directly cause?
Acid rain