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level: Level 1

Questions and Answers List

level questions: Level 1

difference between physical and chemical propertiesphysical property is a characteristic of a substance that can be observed or measured without changing the identity of the substance. chemical property is describes the ability of a substance to undergo a specific chemical change (transforms into different substance)
hydrocarbonsof all organic compounds simplest types contain only hydrogen and carbon atoms
3 means of classification of hydrocarbons1. based on the way their carbon atoms are connected 2. depends on the type of bond between carbons 3. a class of cyclic hydrocarbons that contain a closed loop (sextet) of electrons called aromatic
explain more about 1st classification of themdividing into two main groups, chain aliphatic hydrocarbons and cyclic hydrocarbons
explain more about 2nd classifiationwe have saturated molecules (alkanes) and unsaturated (alkenes and alkynes)
difference between saturated and unsaturatedSaturated fatty acids lack double bonds between the individual carbon atoms, while in unsaturated fatty acids there is at least one double bond in the fatty acid chain.
some of the observed physical properties of hydrocarbons results howfrom nonpolar character of the compounds
do hydrocarbons mix with polar solvents such as water and ethanol?no, they do not mix
do hydrocarbons mix with nonpolar solvents such as ligroinyes but relatively
do hydrocarbons have higher or less density than waterthe density of most hydrocarbons is less than that of water they will float
how do hydrocarbons is determined by the type of bond between carbons present in the compoundby the chemical reactivity
differences between saturated and unsaturated hydrocarbonssaturated hydrocarbons (alkanes) will burn (undergo combustion) they are generally unreactive to most reagents. They will undergo a substitution reaction with halogens, but only if exposed to ultraviolet light. Unsaturated hydrocarbons, alkenes and alkynes, not only burn, but also react by addition of reagents to the double or triple bonds.
explain what will happen for aromatic compounds and non aromaticaromatic compounds have higher carbon-to-hydrogen ratio than non-aromatic compounds, burn with a sooty flame as a result of unburned carbon particles being present. These compounds undergo substitution in the presence of catalysts rather than an addition reaction.
what is the major component in "natural gas"hydrocarbon methane
what are propane and butane used forheating or cooking
what are the products from combustionare carbon dioxide and water and also heat is evolved
Reaction with concentrated sulfuric acid for alkenesAlkenes react with cold concentrated sulfuric acid by addition
Reaction with concentrated sulfuric acid for alkyl sulfonic acidform as products and are soluble in H2SO4.
are saturated hydrocarbons reactive?are unreactive (additions are not possible)
are alkynes reactiveyes but react slowly and require a catalyst (HgSO4)
are aromatic compounds reactiveunreactive since addition reactions are difficult.
Dilute or alkaline solutions of KMnO4 oxidize which compoundsunsaturated compounds
write the evidence that a reaction occurred with potassium permanganateby the loss of the purple color of KMnO4 and the formation of the brown precipitate manganese dioxide, MnO2.
are there any density when hydrocarbons react with petroleum etherno none of them has a density
which of hydrocarbon with the reaction of H2SO4 had a reactioncyclohexane
among hydrocarbons in experiment which one burnt for short timehexane
among hydrocarbons in experiment which one burnt for long time and produced charmtoluene
among hydrocarbons in experiment which one burnt for long timecyclohexene