18 Questions
What is the most important use of alkanes?
Fuel
Describe the color of the flame produced during complete combustion of methane.
Blue
What is the color of bromine water, and how does it change when exposed to sunlight in the presence of an alkane?
Yellow orange; decolorizes
Explain the color of the flame produced during incomplete combustion of methane.
Yellow
Why are alkanes not soluble in strong acids or bases?
Because they are nonpolar
What type of bonds do unsaturated hydrocarbons contain?
Double or triple bonds
What is the combustion reaction of ethylene?
CH2=CH2 + 3O2 -> 2CO2 + 2H2O + heat
What happens when ethylene reacts with bromine in the presence of sunlight?
CH2=CH2 + Br2 + sunlight -> CH2-CH2 Br Br
What is the Baeyer’s test used for in the context of unsaturated hydrocarbons?
A qualitative test for the presence of unsaturation.
What is the color of gas produced by the incomplete combustion of methane?
Colorless
What is the odor of the gas produced by the incomplete combustion of methane?
Odorless
What is the color of the flame when methane undergoes complete combustion?
Blue flame
What type of hydrocarbons are alkanes and what is their characteristic formula?
Alkanes are open-chain saturated hydrocarbons containing only carbon-carbon single bonds. Their formula follows the pattern CnH2n+2.
Describe the reactivity of alkanes at room temperature.
Alkanes are chemically inert or non-reactive at room temperature.
What are unsaturated hydrocarbons and give examples of each type?
Open-chain unsaturated hydrocarbons containing one or more double or triple bonds are called alkenes and alkynes, respectively. Ethylene and acetylene are representative examples.
Explain the reaction of alkenes with bromine.
Alkenes decolorize bromine water, turning it from orange to colorless, due to addition reactions across the double bond.
What is the product of the incomplete combustion of methane?
Incomplete combustion of methane produces carbon monoxide (CO) and water (H2O).
Describe the products of the complete combustion of methane.
Complete combustion of methane results in the formation of carbon dioxide (CO2) and water (H2O).
Learn about a chemistry experiment involving the addition of sulfuric acid to ethylene gas, followed by various tests on the resulted mixture. The experiment includes heating the mixture, collecting gas by water displacement, and performing combustion and bromine reaction tests.
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