What kind of carbon-carbon bonds are found in alkane molecules? …

What kind of carbon-carbon bonds are found in alkane molecules?
Which is a molecule in which three bonds occur between carbon atoms?
A. C2
B. HC2
C. H4
D. C2
E. H6
F.C2
G. H2
Photosynthesis produces
A. proteins
B. lipids
C. Carbohydrates
Cellulose is a
A. protein
B. nuclei acid
C. lipid
D. Carbohydrate
A double helix structure is characteristic of what?
A. proteins
B. lipids
C. carbohydrates
D. DNA
Which of the following are exothermic reactions and which are endothermic?
(a) the formation of nitric oxide from its elementsexothermicendothermic (b) the burning of methaneexothermicendothermic (c) the dissociation of a ammonium nitrate in waterexothermicendothermic (d) the dissociation of calcium chloride in waterexothermicendothermic (e) the decomposition of water into its elementsexothermicendothermic (f) the burning of iron in chlorineexothermicendothermic
Suggest three ways to increase the rate at which zinc dissolves in sulfuric acid.Use powdered zinc or zinc filings to increase the exposed suface area.Increase the temperature.Use large pieces of zinc to decrease the exposed surface area.None of these are appropriate choices.Increase the concentration of sulphuric acid.Decrease the temperature.Decrease the concentration of sulphuric acid.
Methanol (CH3OH) can be synthesized from carbon monoxide and hydrogen by the following reversible reaction.
CO + H2 CH3OH + energy
If the temperature in the reaction chamber is increased, what happens to the yield of methanol?increasesdecreases stays the samecannot be determinedIf the pressure in the reaction chamber is increased, what happens to the yield of methanol?increasesdecreases stays the samecannot be determined
Approximately 4/5 of dry air consists of ? oxygencarbon dioxide nitrogenargon
An example of an exothermic process is? theneutralization of an acid by a basemelting of ice dissociation of a salt in water solutionelectrolysis of water
The chief energy source under human control is ? coalnatural gas petroleumwood
Methane is the chief constituent of? gasolinenatural gas octanepetroleum
The combustion of a hydrocarbon fuel does not produce? H2OH2 CO2CO
Carbon monoxide is a dangerous gas because it?is explosivebinds tightly to hemoglobin in the blood combines with water to form carbonic acidcombines with oxygen to form carbon dioxide
Which of the following are the chief acids in acid rain? (Select all that apply.)
citric acid
hydrochloric acid
nitric acid
sulfuric acid
The speed of a chemical reaction is not affected by?catalyststhe concentration of reactants the surface area of the reactantsthe type of bond in reaction products
For a reaction that takes place near room temperature, an increase of 10°C?increases the reaction speed by about 50%increases the reaction speed by about 10% has almost no effect on the reaction speedapproximately doubles the reaction speed
An enzyme is a ? biological catalystconstituent of natural gas gasoline additive that reduces pollutionsolvent used in electrolysis
Most chemical reactionsare ?reversibleproduce precipitates absorb energyoccur at rates that are independent of temperature
A chemical equilibrium occurs when the?concentration of the products equals the concentration of the reactantsspeed of the forward reaction equals the speed of the reverse reaction number of molecules of the products equals the number of molecules of the reactantsmass of the products equals the mass of the reactants
The yield of the product C in the reversible reaction A C + energy can be decreased by? decreasing the temperatureincreasing the temperature increasing the surface area of the reactantschanging the catalyst
Oxidation-reduction reactions involve the transfer between the reacting substances ofelectrons? H+ ions O2- ionsO2 molecules
When a substance loses electrons in a chemical reaction, the substance is said to be?oxidizedreduced dissociatedactivated
Which of the following equations are balanced? (Select all that apply.)6 Na + Fe2O3 2 Fe + 3 Na2OMnO + 4 HCl MnCl2 + 2 H2O + Cl2C4H10 + 9 O2 4 CO2 + 5 H2O3 H2S + 2 HNO3 3 S + 2 NO+ 4 H2O
What is the missing number (indicated by ??) in the equation below??? AgNO3 + Na2SO4 Ag2SO4 + 2 NaNO314 32
Which one or more of the following equations is (are) balanced? (Select all that apply.)6 H2O + 6 CO2 C6H12O6 + 6 O2PCl2 + 4 H2O H3PO4 + 5 HClC7H16 + 11 O2 7 CO2 + 8 H2OFe3O4 + 4 H2 3 Fe + 4 H2O