General Science

In general science, corrosion refers to:

A negatively charged ion
B negatively charged subatomic particle
C Group 17 elements
D chemical/electrochemical deterioration of a material

Which statement correctly identifies COD?

A methods such as painting, galvanising or alloying that reduce corrosion
B fertiliser supplying nitrogen, phosphorus and potassium
C sodium chloride
D chemical oxygen demand, oxygen equivalent needed for chemical oxidation of substances in water

Which statement correctly identifies methane?

A energy barrier associated with a reaction pathway
B synthetic polyamide polymer
C fossil fuel consisting mainly of methane
D CH4, simplest alkane and major natural-gas component

Which statement correctly identifies distillation?

A arrangement of elements by atomic number and recurring properties
B separation based mainly on differences in boiling points
C elements generally lacking typical metallic properties
D substance changing colour over a characteristic pH range

Which of the following is most closely associated with electrolysis?

A substance changing reaction rate without being consumed overall
B reaction between acid and base forming salt and usually water
C liquid hydrocarbon mixture from geological deposits
D chemical decomposition driven by electric current

Which of the following is most closely associated with nylon?

A an alcohol used in sanitizers, solvents and fuels
B CO2, important greenhouse gas
C substance used to control pests
D synthetic polyamide polymer

Which statement correctly identifies solute?

A substance producing ions in solution or molten state
B large molecule made of repeating structural units
C substance dissolved in a solution
D mixture or solid solution of metals or metal with another element

Which statement correctly identifies molar mass?

A positively charged ion
B Group 1 metals other than hydrogen
C mass of one mole of a substance
D positively charged subatomic particle

In general science, non-metals refers to:

A amorphous inorganic solid commonly based on silica
B reaction absorbing heat
C elements generally lacking typical metallic properties
D compressed natural gas, mainly methane

What is the best description of concentration?

A chemical/electrochemical deterioration of a material
B synthetic polyamide polymer
C amount of solute relative to a specified quantity
D surface vaporisation below boiling point

Which statement correctly identifies cation?

A CO2, important greenhouse gas
B an alcohol used in sanitizers, solvents and fuels
C positively charged ion
D calcium sulfate hemihydrate

In general science, evaporation refers to:

A surface vaporisation below boiling point
B polyvinyl chloride polymer
C corrosion product formed mainly on iron/steel
D liquid hydrocarbon mixture from geological deposits

Which of the following is most closely associated with monomer?

A small molecule that can form a polymer
B ethanoic acid, CH3COOH
C homogeneous mixture of solute and solvent
D calcium hypochlorite-based bleaching/disinfecting material

What is the best description of solute?

A polyvinyl chloride polymer
B substance changing reaction rate without being consumed overall
C substance dissolved in a solution
D liquid hydrocarbon mixture from geological deposits

What is the best description of nylon?

A synthetic polyamide polymer
B temperature at which vapour pressure equals surrounding pressure
C fluoropolymer known for chemical resistance and low friction
D coating iron or steel with zinc

Which of the following is most closely associated with concentration?

A amount of solute relative to a specified quantity
B an alcohol used in sanitizers, solvents and fuels
C substance used to control pests
D CO2, important greenhouse gas

Which of the following is most closely associated with fuel?

A substance releasing usable energy in combustion or another process
B gain of electrons or decrease in oxidation state
C polymer produced from ethene
D solid fossil fuel formed largely from ancient plant matter

Which statement correctly identifies salt?

A chemical/electrochemical deterioration of a material
B ionic compound of cations and anions
C water containing appreciable calcium or magnesium ions
D surface vaporisation below boiling point

Which of the following is most closely associated with galvanisation?

A coating iron or steel with zinc
B elements generally lacking typical metallic properties
C reaction releasing heat
D substance changing colour over a characteristic pH range

Which of the following is most closely associated with molecule?

A chemical decomposition driven by electric current
B synthetic surfactant used for cleaning
C temperature at which solid and liquid coexist at specified pressure
D two or more atoms chemically bonded

Which of the following is most closely associated with PVC?

A acidic precipitation associated mainly with sulfur and nitrogen oxides
B NH3, basic nitrogen compound used in fertilisers
C polyvinyl chloride polymer
D calcium oxide

Which of the following is most closely associated with COD?

A combination of substances retaining their chemical identities
B vertical column in the periodic table
C number of protons plus neutrons
D chemical oxygen demand, oxygen equivalent needed for chemical oxidation of substances in water

Which of the following is most closely associated with metals?

A elements generally showing conductivity, malleability and ductility
B fluoropolymer known for chemical resistance and low friction
C coating iron or steel with zinc
D liquefied petroleum gas, mainly propane and butane

Which statement correctly identifies molecule?

A fluoropolymer known for chemical resistance and low friction
B reaction releasing heat
C liquefied petroleum gas, mainly propane and butane
D two or more atoms chemically bonded

What is the best description of ozone?

A compressed natural gas, mainly methane
B O3, allotrope of oxygen
C chemical decomposition driven by electric current
D amorphous inorganic solid commonly based on silica