General Science

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

What is the best description of gypsum?

A substance used to control pests
B CO2, important greenhouse gas
C smallest unit of an element retaining its chemical identity
D calcium sulfate dihydrate

Which statement correctly identifies combustion?

A positively charged subatomic particle
B rapid reaction with an oxidant commonly releasing heat
C Group 1 metals other than hydrogen
D positively charged ion

Which of the following is most closely associated with halogens?

A Group 17 elements
B rapid reaction with an oxidant commonly releasing heat
C large molecule made of repeating structural units
D mixture or solid solution of metals or metal with another element

Which of the following is most closely associated with base?

A substance accepting H+ or producing OH− in water
B surface vaporisation below boiling point
C water containing appreciable calcium or magnesium ions
D calcium sulfate dihydrate

Which of the following is most closely associated with carbon dioxide?

A methods such as painting, galvanising or alloying that reduce corrosion
B pure substance formed by chemical combination of elements in fixed proportions
C CO2, important greenhouse gas
D fertiliser supplying nitrogen, phosphorus and potassium

Which statement correctly identifies BOD?

A NH3, basic nitrogen compound used in fertilisers
B biochemical oxygen demand, oxygen consumed by microbes decomposing organic matter in water
C anything having mass and occupying space
D acidic precipitation associated mainly with sulfur and nitrogen oxides

Which of the following is most closely associated with fertiliser?

A loss of electrons or increase in oxidation state
B substance donating H+ in Brønsted-Lowry theory
C horizontal row in the periodic table
D material supplying plant nutrients

Which of the following is most closely associated with combustion?

A reaction between acid and base forming salt and usually water
B rapid reaction with an oxidant commonly releasing heat
C fossil fuel consisting mainly of methane
D substance changing reaction rate without being consumed overall

Which of the following is most closely associated with acid?

A temperature at which solid and liquid coexist at specified pressure
B chemical decomposition driven by electric current
C substance donating H+ in Brønsted-Lowry theory
D synthetic surfactant used for cleaning

Which statement correctly identifies glass?

A amorphous inorganic solid commonly based on silica
B salts of higher fatty acids
C NH3, basic nitrogen compound used in fertilisers
D calcium oxide

Which statement correctly identifies mixture?

A measure related to hydrogen-ion activity/concentration
B combination of substances retaining their chemical identities
C reaction involving oxidation and reduction together
D solid fossil fuel formed largely from ancient plant matter

Which statement correctly identifies base?

A substance accepting H+ or producing OH− in water
B polyvinyl chloride polymer
C corrosion product formed mainly on iron/steel
D liquid hydrocarbon mixture from geological deposits

Which statement correctly identifies galvanisation?

A combining capacity of an atom or ion
B pure substance whose atoms have the same atomic number
C coating iron or steel with zinc
D uncharged subatomic particle

Which of the following is most closely associated with boiling point?

A coating iron or steel with zinc
B temperature at which solid and liquid coexist at specified pressure
C temperature at which vapour pressure equals surrounding pressure
D synthetic surfactant used for cleaning