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What is the heaviest hydrocarbon fraction produced by fractional distillation?
The heaviest fractions of crude oil are used for tar and/or asphalt.
What is distillation used to separate?
distillation is used to separate solutions of different boiling points though often complete separation of solutions can't be achieve due to azotrops example - when separating water and ethanol the fluid with the highest boiling point is ~97% ethanol ~3% water due entropic considerations
What is a metal washer?
It is usually referring to a flat metal ring that is used in conjunction with a nut and bolt. It can be used to distribute force to avoid the bolt pulling through the metal or wood. It also can be used in spacing and as a crude friction easing device.
Does a lighter produce as much heat as a soldering iron?
No, lighter can produce 120 degree Celsius temperature where as soldering iron can produce 420 degree Celsius temperature. the soldering iron is used to join two metal wires.
What is a disadvantage of using conventional crude oil as an energy resource?
It's limited so it could only go more and more expensive. When used it release pollutants to air.
