Gas tests
What is the test for hydrogen?
Burns with a squeaky pop
State the three sides of the fire triangle.
Fuel, fire, oxygen
True
True or false: and endothermic reaction releases heat energy.
False
Which has a higher boiling point, ethanol or water?
If you introduce a glowing splint in a tube with this gas it will re-light. Which gas is it?
Oxygen
State the definition of a fuel.
A fuel is a substance that burns in oxygen to release energy.
Which type of dead organisms makes coal?
Plants
True or false: In an endothermic reaction, the temperature increases.
False
Which liquid will evaporate first, ethanol or water?
Ethanol
Turns limewater cloudy.
Carbon dioxide
Which elements make up a hydrocarbon?
Hydrogen and Carbon
Which type of organisms make oil?
Dead sea plants and animals
Is cooking an egg an exothermic reaction?
No, this is an endothermic reaction.
Name two fractions obtained from crude oil.
Refinery gas / Petrol / Naphtha / Kerosene / Diesel / Fuel oil / Bitumen
Which gas is needed to burn a fuel?
Oxygen
Name the products of complete combustion of a hydrocarbon.
Carbon dioxide and water.
How long ago were fossil fuels formed?
300 million years
Which type of reaction, endothermic or exothermic, is burning a fuel?
Exothermic
What is a fraction (from fractional distillation)?
A fraction is a mixture of hydrocarbons with similar boiling points.
Name a gas that is formed when we burn hydrocarbons.
Carbon dioxide / water vapour
Name the products of incomplete combustion of a hydrocarbon.
Carbon monoxide / carbon (soot) and water
What are the conditions needed for fossil fuels to form?
Heat and pressure
A student burned a candle and an spirit lamp for 5 minutes. When they burned the candle, the temperature of the water increased by 25C, but when they burned an alcohol the temperature increased by 20C. Which fuel released more energy?
Candle.
Complete the sentence: as the number of carbon atoms decreases, the boiling point of the fraction.......
decreases.